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Virtual Private Network (VPN)

Published by Theresa Fields Modified over 8 years ago

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Presentation on theme: "Virtual Private Network (VPN)"— Presentation transcript:

Virtual Private Networks COSC541 Project Jie Qin & Sihua Xu October 11, 2014.

1 Intel / Shiva VPN Solutions Stephen Wong System Engineer.

VPN: Virtual Private Network Presented by: Germaine Bacon Lizzi Beduya Betty Huang Jun Mitsuoka Juliet Polintan.

Setting Up a Virtual Private Network Chapter 9. Learning Objectives Understand the components and essential operations of virtual private networks (VPNs)

© 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 1 Version 4.0 Prototyping the WAN Designing and Supporting Computer Networks – Chapter 8.

Virtual Private Networks. Why VPN Fast, secure and reliable communication between remote locations –Use leased lines to maintain a WAN. –Disadvantages.

SCSC 455 Computer Security Virtual Private Network (VPN)

1 Configuring Virtual Private Networks for Remote Clients and Networks.

Guide to Network Defense and Countermeasures Second Edition

Eric Kilroy. Introduction  Virtual Private Network A way to connect to a private network through a public network such as the internet.

VPNs Virtual Private Networks. VPNs: Purpose Emulate a private network using shared Service Provider infrastructure Same policies as private network What.

1 IP VPN Nikolay Scarbnik. 2 Agenda Introduction………………………………………………………….3 VPN concept definition……………………………………………..4 VPN advantages……………...…………………………………….5.

In this section, we'll cover one of the foundations of network security issues, It talks about VPN (Virtual Private Networks). What..,Why..,and How….?

Goal of The Paper  What exactly is a VPN?  Why do you need a VPN?  what are some of the technologies used in deploying a VPN?  How does a VPN work?

Virtual Private Networks Globalizing LANs Timothy Hohman.

Virtual Private Networking Karlene R. Samuels COSC513.

Chapter 10 Virtual Private Networks. VPN Defined  A segment of the public network made to appear part of a private network so that it can be used to.

VPN – Technologies and Solutions CS158B Network Management April 11, 2005 Alvin Tsang Eyob Solomon Wayne Tsui.

Remote Networking Architectures

Virtual Private Network (VPN) © N. Ganesan, Ph.D..

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VPN PowerPoint Presentation Template and Google Slides

VPN Presentation Slide

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It has PPT slides covering wide range of topics showcasing all the core areas of your business needs. This complete deck focuses on VPN Tunnel Structure Architecture Corporate Internet Connection Servers Network and consists of professionally designed templates with suitable graphics and appropriate content. This deck has total of twelve slides. Our designers have created customizable templates for your convenience. You can make the required changes in the templates like colour, text and font size. Other than this, content can be added or deleted from the slide as per the requirement. Get access to this professionally designed complete deck PPT presentation by clicking the download button below.

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Presenting this set of slides with name - Vpn Network With Server Lan And Nodes. This is a three stage process. The stages in this process are Vpn, Virtual Private Network.

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Ditch the Dull templates and opt for our engaging VPN Implementation Plan Powerpoint Presentation Slides deck to attract your audience. Our visually striking design effortlessly combines creativity with functionality, ensuring your content shines through. Compatible with Microsoft versions and Google Slides, it offers seamless integration of presentation. Save time and effort with our pre-designed PPT layout, while still having the freedom to customize fonts, colors, and everything you ask for. With the ability to download in various formats like JPG, JPEG, and PNG, sharing your slides has never been easier. From boardroom meetings to client pitches, this deck can be the secret weapon to leaving a lasting impression.

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This slide discusses the issues faced by the organization due to existing IT infrastructure such as data interception, unauthorized access, etc.Present the topic in a bit more detail with this Statistics Of Existing It Infrastructure Attacks Vpn Implementation Plan. Use it as a tool for discussion and navigation on Sales, Finance, Marketing, Analytics. This template is free to edit as deemed fit for your organization. Therefore download it now.

This slide gives an overview of the phases in the process of OpenVPN protocol, sub-phases, person responsible, and status.Deliver an outstanding presentation on the topic using this Virtual Private Network Configuration Steps Vpn Implementation Plan. Dispense information and present a thorough explanation of Phases, Person Responsible, Status using the slides given. This template can be altered and personalized to fit your needs. It is also available for immediate download. So grab it now.

This slide outlines the comparison between software defined wide area network and virtual private network. The purpose of this slide is to highlight the key points which differentiate both technologies. The key areas include cost, configuration and maintenance, performance, reliability, and bandwidth.Deliver an outstanding presentation on the topic using this Difference Between SD WAN And Virtual Private Network VPN Managed Wan Services. Dispense information and present a thorough explanation of Configuration Maintenance, Dynamic Bandwidth, Performance Optimization using the slides given. This template can be altered and personalized to fit your needs. It is also available for immediate download. So grab it now.

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This slide outlines the comparison between software-defined wide-area network and virtual private network. The purpose of this slide is to highlight the key points which differentiate both technologies. The key areas include cost, configuration and maintenance, performance, reliability, and bandwidth. Present the topic in a bit more detail with this Sd Wan As A Service Difference Between Sd Wan And Virtual Private Network Vpn Sd Wan Ppt Diagrams. Use it as a tool for discussion and navigation on Key Areas, Sd Wan, Vpn. This template is free to edit as deemed fit for your organization. Therefore download it now.

The purpose of this slide is to demonstrate a reference guide for most suitable VPN protocol selection based on specific use cases and their corresponding requirements. These use cases are streaming, downloads, gaming and privacy. Deliver an outstanding presentation on the topic using this Encryption Implementation Strategies Selecting VPN Protocols For Different Use Cases. Dispense information and present a thorough explanation of Demonstrate A Reference Guide, Corresponding Requirements, Streaming, Gaming And Privacy using the slides given. This template can be altered and personalized to fit your needs. It is also available for immediate download. So grab it now.

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This slide outlines the comparison between software defined wide area network and virtual private network. The purpose of this slide is to highlight the key points which differentiate both technologies. The key areas include cost, configuration and maintenance, performance, reliability, and bandwidth. Deliver an outstanding presentation on the topic using this Difference Between SD WAN And Virtual Private Network VPN Cloud WAN. Dispense information and present a thorough explanation of Cost, Maintenance, Performance using the slides given. This template can be altered and personalized to fit your needs. It is also available for immediate download. So grab it now.

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This slide outlines the comparison between software-defined wide-area network and virtual private network. The purpose of this slide is to highlight the key points which differentiate both technologies. The key areas include cost, configuration and maintenance, performance, reliability, and bandwidth. Present the topic in a bit more detail with this Difference Between Sd Wan And Virtual Private Network Vpn Software Defined Wide Area Network. Use it as a tool for discussion and navigation on Performance, Bandwidth, Reliability. This template is free to edit as deemed fit for your organization. Therefore download it now.

This slide outlines the limitations of virtual private network-based remote access services. The purpose of this slide is to showcase the various challenges of the VPN network system and how the zero trust network model can overcome those issues. Present the topic in a bit more detail with this Challenges Of VPN Based Remote Access Solutions Zero Trust Architecture ZTA. Use it as a tool for discussion and navigation on Implicit Trust, Performance Problems, Security. This template is free to edit as deemed fit for your organization. Therefore download it now.

This slide represents the comparison between the zero trust security model, software-defined perimeter, and virtual private network. The purpose of this slide is to showcase the difference as well as the relationship between three security technologies such as zero trust, SDP and VPN. Introducing Comparison Between Zero Trust Model SDP And VPN Ppt File Backgrounds to increase your presentation threshold. Encompassed with four stages, this template is a great option to educate and entice your audience. Dispence information on Goal, Trust Security, Data Secure, using this template. Grab it now to reap its full benefits.

This slide outlines the limitations of virtual private network-based remote access services. The purpose of this slide is to showcase the various challenges of the VPN network system and how the zero trust network model can overcome those issues. Present the topic in a bit more detail with this Challenges Of VPN Based Remote Access Solutions Identity Defined Networking Use it as a tool for discussion and navigation on Performance Problems, Visibility And Security, Unreliability This template is free to edit as deemed fit for your organization. Therefore download it now.

This slide represents the comparison between the zero trust security model, software-defined perimeter, and virtual private network. The purpose of this slide is to showcase the difference as well as the relationship between three security technologies such as zero trust, SDP and VPN. Introducing Comparison Between Zero Trust Model SDP And VPN Identity Defined Networking to increase your presentation threshold. Encompassed with three stages, this template is a great option to educate and entice your audience. Dispence information on Goal, Zero Trust Security, Access To Company using this template. Grab it now to reap its full benefits.

This slide describes the importance of Network Address Translation and Virtual Private Networks in a firewall system. The purpose of this slide is to showcase the functions of NAT and VPN in firewall systems, such as translating the IP addresses, preserving limited IPv4 addresses, etc. Present the topic in a bit more detail with this Firewall Network Security Importance Of NAT And VPN In Firewall Systems Use it as a tool for discussion and navigation on Consistent Security, Statistical Anomaly Detection, Stateful Protocol Analysis Detection This template is free to edit as deemed fit for your organization. Therefore download it now.

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This slide showcases the difference of ipsec and openvpn protocols on the basis of aspects such as negotiation time, port configuration, etc. Present the topic in a bit more detail with this Comparative Analysis Of Ipsec And OpenVPN Protocols Virtual Private Network VPN. Use it as a tool for discussion and navigation on Comparative Analysis, Openvpn Protocols, Negotiation Time, Port Configuration. This template is free to edit as deemed fit for your organization. Therefore download it now.

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This slide highlights the difference between VPN and proxy servers based on aspects such as security features, supported protocols, etc. Deliver an outstanding presentation on the topic using this Virtual Private Network VPN Comparative Analysis Of VPN And Proxy Servers. Dispense information and present a thorough explanation of Operational Environment, Supported Protocols, Network Simulation using the slides given. This template can be altered and personalized to fit your needs. It is also available for immediate download. So grab it now.

This slide highlights the comparison of WireGuard and OpenVPN protocols based on aspects such as speed, encryption, etc. Present the topic in a bit more detail with this Virtual Private Network VPN Comparative Analysis Of Wireguard And OpenVPN Protocols. Use it as a tool for discussion and navigation on Operational Environment, Supported Protocols, Network Simulation. This template is free to edit as deemed fit for your organization. Therefore download it now.

This slide represents the configuration of WireGuard in windows 10 Virtual Private Network client. Deliver an outstanding presentation on the topic using this Virtual Private Network VPN Configuring Wireguard Windows 10 VPN Client. Dispense information and present a thorough explanation of Configuration Of Wireguard, Virtual Private Network Client, Connection Is To Be Configured using the slides given. This template can be altered and personalized to fit your needs. It is also available for immediate download. So grab it now.

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This slide highlights the comparison of point-to-point tunneling protocol and Open Virtual Private Network protocol. Deliver an outstanding presentation on the topic using this Virtual Private Network VPN Difference Between PPTP And OpenVPN Protocols. Dispense information and present a thorough explanation of Point To Point Tunneling Protocol, Open Virtual Private, Network Protocol using the slides given. This template can be altered and personalized to fit your needs. It is also available for immediate download. So grab it now.

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Free VPN PowerPoint Template

Free VPN PowerPoint Template is a presentation template ready for use on topics related to Private Internet Access, VPN services, and Internet privacy.

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VPN services have been rising during the last decade due to privacy concerns. Services like NordVPN, Express VPN, Surfshark, Windscribe and others are available online.

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VPN (Virtual Private Networks)

Sep 10, 2014

2.58k likes | 3.76k Views

VPN (Virtual Private Networks). Sommaire. • Présentation des VPN • Scénarios VPN • Choix de technologies VPN • VPN termes clés • IPSec • Présentation du système de cryptage de l'IOS Cisco • Cryptage • Technologies IPSec • Taches de configuration IPSec. Présentation des VPN.

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VPN(Virtual Private Networks) ccnp_cch

Sommaire • Présentation des VPN• Scénarios VPN• Choix de technologies VPN• VPN termes clés• IPSec• Présentation du système de cryptage de l'IOS Cisco• Cryptage• Technologies IPSec• Taches de configuration IPSec ccnp_cch

Présentation des VPN Un VPN transporte du trafic privé sur un réseau public en utilisant du cryptage et destunnels pour obtenir: • La confidentialité des données • L'intégrité des données • L'authentification des utilisateurs • Un réseau privé virtuel (VPN) est défini comme une connectivité réseau déployée sur une infrastructure partagée avec les mêmes politiques de sécurité que sur un réseau privé.• Un VPN peut être entre deux systèmes d'extrémité ou entre deux ou plusieurs réseaux.• Un VPN est construit en utilisant des tunnels et du cryptage. Un VPN peut être construit au niveau de n'importe quelle couche du modèle OSI.• Un VPN est une infrastructure WAN alternative aux réseaux privés qui utilisent des lignes louées ou des réseaux d'entreprise utilisant Fame Relay ou ATM. ccnp_cch

Présentation des VPN Un VPN transporte du trafic privé sur un réseau public en utilisant du cryptage et destunnels pour obtenir: • La confidentialité des données • Intégrité des données • L'authentification des utilisateurs • Les VPNs fournissent trois fonctions essentielles: - Confidentialité (cryptage) - L'émetteur peut crypter les paquets avant de les transmettre dans le réseau. - Par ce moyen, si la communication est interceptée les données ne pourront pas être lues. - Intégrité des données - Le récepteur peut vérifier si les données n'ont pas été altérées lors de leur passage dans le réseau. - Authentification - Le récepteur peut authentifier la source du paquet, garantissant et certifiant la source de l'information. ccnp_cch

Internet Internet Présentation des VPN VPN Conventionnel Site Central Site Central Frame Relay Frame Relay RéseauFrame Relay RéseauFrame Relay TunnelVPN Frame Relay Frame Relay Site distant Site distant • Coût élevé• Peu flexible• Gestion WAN• Topologies complexes • Faible coût • Plus flexible• Gestion simplifiée• Topologie tunnel • Les principaux avantages sont: - Les VPNs amènent des coûts plus faibles que les réseaux privés. - Les coûts de la connectivité LAN-LAN sont réduits de 20 à 40 pourcent par rapport à une ligne louée. . - Les VPNs offrent plus de flexibilité et d'évolutivité que des architectures WAN classiques ccnp_cch

Internet Internet Présentation des VPN VPN Conventionnel Site Central Site Central Frame Relay Frame Relay RéseauFrame Relay RéseauFrame Relay TunnelVPN Frame Relay Frame Relay Site distant Site distant • Coût élevé• Peu flexible• Gestion WAN• Topologies complexes • Faible coût • Plus flexible• Gestion simplifiée• Topologie tunnel • Les principaux avantages sont: - Les VPNs simplifient les tâches de gestion comparé à la l'exploitation de sa propre infrastructure de réseau. - Les VPNs fournissent des topologies de réseaux avec tunnels qui réduisent les taches de gestion. - Un backbone IP n'utilise pas les circuits virtuels permanents (PVCs) avec des protocoles orientés connexion tels ATM et Frame Relay. ccnp_cch

Réseau Virtuel Tunneling Présentation des VPN Réseau Privé Cryptage MessageCrypté Cryptage Décryptage • Un réseau virtuel est crée en utilisant la capacité de faire transporter un protocole par un autre (Tunnel) sur une connexion IP standard.• GRE (Generic Routing Encapsulation) et L2TP (Layer 2 Tunneling Protocol) sont deux méthodes de "tunneling" et sont toutes les deux configurables sur les routeurs Cisco.• La troisième méthode, IPSec est également configurable sur les routeurs Cisco.• Un réseau privé assure la Confidentialité, l'Intégrité et l'Authentification.• Le cryptage des données et le protocole IPSec permettent aux données de traverser Internet avec la même sécurité que sur un réseau privé. ccnp_cch

Tunnel MessageCrypté Infos Infos Cryptage Décryptage Présentation des VPN • Tunneling et Cryptage • Un tunnel est une connexion point à point virtuelle• Un tunnel transporte un protocole à l'intérieur d'un autre• Le cryptage transforme les informations en texte chiffré• Le décryptage restore les informations à partir du texte chiffré • Bien que Internet ait offert de nouvelles opportunités aux entreprises, il a aussi crée une grande dépendance des réseaux et un besoin de protection contre une grande variété de menaces sur la sécurité.• La fonction principale d'un VPN est d'offrir cette protection avec du cryptage au travers d'un tunnel. ccnp_cch

Tunnel MessageCrypté Infos Infos Cryptage Décryptage Présentation des VPN • Tunneling et Cryptage • Un tunnel est une connexion point à point virtuelle• Un tunnel transporte un protocole à l'intérieur d'un autre• Le cryptage transforme les informations en texte chiffré• Le décryptage restore les informations à partir du texte chiffré • Les tunnels fournissent des connexions logiques point à point au travers d'un réseau IP en mode non-connecté.• Ceci permet d'utiliser des fonctionnalités de sécurité améliorées.• Les Tunnels des solutions VPN emploient le cryptage pour protéger les données pour qu'elles ne soient pas lisibles par des entités non-autorisées et l'encapsulation multiprotocole si cela est nécessaire. ccnp_cch

Tunnel MessageCrypté Infos Infos Cryptage Décryptage Présentation des VPN • Tunneling et Cryptage • Un tunnel est une connexion point à point virtuelle• Un tunnel transporte un protocole à l'intérieur d'un autre• Le cryptage transforme les informations en texte chiffré• Le décryptage restore les informations à partir du texte chiffré • Le cryptage assure que le message pourra pas être lu et compris uniquement par le receveur• Le cryptage transforme une information en un texte chiffré sans signification sous sa forme cryptée.• Le décryptage restore le texte chiffré en information originale destinée au receveur. ccnp_cch

Scénarios VPN Routeur à Routeur PC à Routeur/Concentrateur PC à Pare-Feu Routeur à plusieurs routeurs ccnp_cch

Scénarios VPN Partenaire Fournisseur Entreprise AAA DMZ OpérateurB OpérateurA Serveurs WebServeur DNSRelais Mail SMTP Agence Utilisateur Mobileou Télétravailleur AgenceRégionale ServiceDistant • Un réseau basé uniquement sur des connexions fixes entre des sites d'entrprises tels que des agences locales ou régionales avec un site central n'est plus suffisant aujourd'hui pour beaucoup d'entreprises. • Des options de connexions avec des clients , des partenaires commerciaux dans un système plus ouvert sont des ajouts aux connexions réseau standards. ccnp_cch

Sites Distants Site Central DSLCableModem Internet Internet Intranet ExtranetB to B Intranet POP POP POP Scénarios VPN Accès Distants Clients Site Central DSLCable Télétravailleur Télétravailleur Extranet Business Mobile • Il y a deux types d'accès VPN: - Initié par le client - Des utilisateurs distants utilisent des clients VPN pour établir un tunnel sécurisé au travers d'un réseau d'opérateur avec une entreprise. - Initié par le serveur d'accès Réseau - Les utilisateurs distants se connectent à un opérateur - Le serveur d'accès distant établit un tunnel sécurisé vers le réseau privé de l'entreprise qui doit pouvoir supporter de multiples sessions distantes initiées par un utilisateur. ccnp_cch

POP POP Scénarios VPN • VPN initié par le client Accès Distants Clients Site Central DSLCable Internet Télétravailleur Extranet Business Mobile • Les VPNs site à site ont aussi deux fonctions principales: - Les VPNs Intranet connectent des sites centraux d'entreprise, des sites distants, des agences au travers d'une infrastructure publique. - Les VPNs Extranets relient des clients, des fournisseurs, des partenaires commerciaux à un intranet d'entreprise au travers d'une infrastructure publique. ccnp_cch

POP POP Scénarios VPN • VPN initié par le client Accès Distants Clients Site Central DSLCable Internet Télétravailleur Extranet Business Mobile • L' accès distant est ciblé pour les utilisateurs mobiles ou les télétravailleurs.• Les entreprises supportaient les utilisateurs distants via des réseaux d'accès par appel. - Ce scénario nécessitait un appel payant ou un numéro vert pour accéder à l'entreprise.• Avec l'arrivée des VPNs, les utilisateurs mobiles peuvent se connecter à leur opérateur pour accéder à l'entreprise via Internet quelque soit l'endroit ou ceux-ci se trouvent.• Les accès distants VPN peuvent satisfaire les besoins des utilisateurs mobiles, des clients Extranet, des télétravailleurs, etc.... ccnp_cch

Accès Distants Clients Site Central DSLCable Internet Télétravailleur Extranet Business Mobile POP POP Scénarios VPN • VPN initié par le client • Les VPNs Accès distant sont une extension des réseaux d'accès distants par appel.• Les VPNs Accès distant peuvent se terminer sur des équipements frontaux tels que les routeurs Cisco, les pare-feu PIX ou les concentrateurs VPN.• Les clients accès distant peuvent être des routeurs Cisco et des clients VPN Cisco. ccnp_cch

Scénarios VPN • VPN initié par le serveur d'accès Site Central Sites Distants DSLCableModem Internet POP Télétravailleur Intranet ExtranetB to B Intranet • Un VPN site à site peut être utilisé pour connecter des sites d'entreprise. Des lignes louées ou une connexion Frame Relay étaient nécessaires mais aujourd'hui toutes les entreprises ont un accès Internet.• Un VPN peut supporter des intranets de l'entrprise et des extranets des partenaires commerciaux• Les VPNs site à site peuvent être construits avec des routeurs Cisco, des pare-feu PIX et des concentrateurs VPN. ccnp_cch

Choix de technologies VPN• Cryptage dans plusieurs couches Couche Application SSHS/MIME ApplicationCouches (5-7) SSL Couche Transport Couche Réseau IPSec Réseau/TransportCouches (3-4) Physique/LiaisonCouches (1-2) CryptageCoucheLiaison CryptageCoucheLiaison • Différentes méthodes pour la protection de VPN sont implémentées sur différentes couches.• Fournir de la protection et des services de cryptographie au niveau de la couche application était très utilisé dans le passé et l'est toujours pour des cas très précis. ccnp_cch

Choix de technologies VPN• Cryptage dans plusieurs couches Couche Application SSHS/MIME ApplicationCouches (5-7) Couche Transport SSL Couche Réseau IPSec Réseau/TransportCouches (3-4) Physique/LiaisonCouches (1-2) CryptageCoucheLiaison CryptageCoucheLiaison • L'IETF a un protocole basé sur des standards appelé S/MIME ( Secure/Multipurpose Internet Mail Extensions) pour des applications VPNs générées par différents composants d'un système de communication. - Agents de transfert de message, passerelles,...• Cependant, la sécurité au niveau de la couche application est spécifique à l'application et les méthodes de protection doivent être implémentées à chaque nouvelle application. ccnp_cch

Choix de technologies VPN• Cryptage dans plusieurs couches Couche Application SSHS/MIME ApplicationCouches (5-7) Couche Transport SSL Couche Réseau IPSec Réseau/TransportCouches (3-4) Physique/LiaisonCouches (1-2) CryptageCoucheLiaison CryptageCoucheLiaison • Des standards au niveau de la couche transport ont eu beaucoup de succés• Le protocole tel SSL (Secure Socket Layer) pournit de la protection, de l'authentification de l'intégrité aux applications basées sur TCP.• SSL est communément utilisé par les sites de e-commerce mais manque de flexibilité, n'est pas facile à implémenter et dépend de l'application. ccnp_cch

Choix de technologies VPN • Cryptage dans plusieurs couches Couche Application SSHS/MIME ApplicationCouches (5-7) Couche Transport SSL Couche Réseau IPSec Réseau/TransportCouches (3-4) Physique/LiaisonCouches (1-2) CryptageCoucheLiaison CryptageCoucheLiaison • La protection aux niveau des couches basses du modèle à été aussi utilisée dans les systèmes de communication, spécialement par la couche liaison. - Cette protection au niveau de la couche liaison fournissait une protection indépendante du du protocole sur des les liaisons non-sécurisées. - La protection au niveau de la couche liaison coûte cher car elle doit être réalisée pour chaque liaison. - Elle n'exclut pas l'intrusion au moyen de stations intermédiaires ou de routeurs et de plus est très souvent propriétaire. ccnp_cch

Choix de technologies VPN ApplicationCouches (5-7) Couche Réseau Réseau/TransportCouches (3-4) L2FL2TPPPTP IPSecGRE Physique/LiaisonCouches (1-2) • Un ensemble de technologies de couche réseau sont disponibles pour permettre le tunneling de protocoles au travers de réseaux pour réaliser des VPNs.• Les trois protocoles de tunneling les lpus utilisés sont: - L2TP ( Layer 2 Tunneling Protocol) - GRE ( Generic Routing Encapsulation par Cisco) - IPSec (IP Security) ccnp_cch

Choix de technologies VPN • L2TP - Layer 2 Tunneling Protocol ApplicationCouches (5-7) Couche Réseau Réseau/TransportCouches (3-4) L2FL2TPPPTP IPSecGRE Physique/LiaisonCouches (1-2) • Avant le standard L2TP (Août 1999), Cisco utilisait L2F (Layer 2 Forwarding) comme protocole de tunneling propriétaire. - L2TP est compatible avec L2F - L2F n'est pas compatible avec L2TP• L2TP est une cominaison de Cisco L2F et Microsoft PPTP - Microsoft supporte PPTP dans les anciennes versions de Windows et PPTP/L2TP dans Windows NT/2000. ccnp_cch

Choix de technologies VPN • L2TP - Layer 2 Tunneling Protocol ApplicationCouches (5-7) Couche Réseau Réseau/TransportCouches (3-4) L2FL2TPPPTP IPSecGRE Physique/LiaisonCouches (1-2) • L2TP est utilisé pour créer un VPDN (Virtual Private Dial Network) multiprotocole et indépendant du média.• L2TP permet aux utilisateurs d'invoquer des politiques de sécurité au travers de toute liaison VPN ou VPDN comme une extension de leur propre réseau interne.• L2TP ne fournit pas de cryptage et peut être supervisé par un analyseur de réseau. ccnp_cch

Choix de technologies VPN • Cisco GRE (Generic Routing Encapsulation) ApplicationCouches (5-7) Couche Réseau Réseau/TransportCouches (3-4) L2FL2TPPPTP IPSecGRE Physique/LiaisonCouches (1-2) • Ce protocole transpoteur multiprotocole encapsules IP, CLNP et tout autre paquet de protocole dans des tunnels IP.• Avec le tunneling GRE, un routeur Cisco encapsule à chaque extrémité les paquets de protocole avec un en-tête IP créant une liaison virtuelle point à point avec l'autre routeur Cisco à l'autre extrémité du réseu IP.• En connectant des réseaux d'extrémité multiprotocoles avec un backbone IP, le tunneling IP permet l'expansion du réseau au travers du backbone IP.• GRE ne fournit pas de cryptage et peut être supervisé par un analyseur de réseau. ccnp_cch

Choix de technologies VPN • IPSec (IP Security protocol) ApplicationCouches (5-7) Couche Réseau Réseau/TransportCouches (3-4) L2FL2TPPPTP IPSecGRE Physique/LiaisonCouches (1-2) • IPSec est un bon choix pour sécuriser les VPNs d'entreprise• IPSEc est un cadre de standards ouverts qui fournissent la confidentialité, l'intégrité et l'authentification des données entre deux extrémités.• IPSec fournit ces services de sécurité en utilisant IKE (Internet Key Exchange) pour gérer la négociation de protocoles et d'algorithmes basée sur une politiqie locale et de générer les clés d'authentification et de cryptage devant être utilisées par IPSec. ccnp_cch

IP seul? Oui TraficUtilisateur Non Unicast seul? Utilisez unTunnel GREou L2TP Oui Non Utilisez unVPNIPSec Choix de technologies VPN • Choix de la meilleure technologie • Sélectionnez la meilleure technologie VPN pour fournir une connectivité réseau selon les besoins du trafic.• Le diagramme ci-dessus montre le processus de choix d'un tunneling de couche réseau basé sur les diférents scénarios de VPN. ccnp_cch

Choix de technologies VPN • Choix de la meilleure technologie • IPSEc est le meilleur choix pour sécuriser des VPNs d'entreprise. - Malheureusement IPSec supporte uniquement le trafic IP unicast. - Si les paquets IP unicast doivent être encapsulés dans un tunnel, l'encapsulation IPSec est suffisante et moins compliquée à configurer et à vérifier. • Pour du tunneling multiprotocole ou IP multicast, utilisez GRE ou L2TP. - Pour des réseaux qui utilisent Microsoft, L2TP peut être le meilleur choix. - A cause de son lien avec PPP, L2TP peut être souhaitable pour des VPNs accès distant avec support multiprotocole.• GRE est le meilleur choix pour des VPNs site à site avec support multiprotocole. - GRE est également utilisé pour des tunnels de paquets multicast tels les protocoles de routage. - GRE encapsule tout trafic, quelque soit la source ou la destination.• Ni L2TP, ni GRE supportent le cryptage des données ou l'intégrité des paquets. Utilisez IPSec en combinaison avec L2TP et/ou GRE pour obtenir le cryptage et l'intégrité IPSec. ccnp_cch

VPN - Termes clés • Tunnel• Cryptage/Décryptage• Cryptosystème• Hashing• Athentification• Autorisation• Gestion de clé• Certificat ccnp_cch

Tunnel MessageCrypté Infos Infos Cryptage Décryptage VPN - Termes clés • Tunnel - Connexion virtuelle point à point utilisée dans un réseau pour transporter le trafic d'un protocole encapsulé dans un autre protocole. Par exemple du texte crypté transporté dans un paquet IP. ccnp_cch

Tunnel MessageCrypté Infos Infos Cryptage Décryptage VPN - Termes clés • Cryptage/Décryptage - Le cryptage est un processus qui transforme une information en un texte chiffré qui pourra pas être lu ou utilisé par des utilisateurs non-autorisés. Le décryptage restore le texte chiffré en information originale qui pourra être lue et utilisée par le receveur. ccnp_cch

VPN - Termes clés Tunnel MessageCrypté Infos Infos Cryptage Décryptage • Cryptosystème - Système qui réalise le cryptage/décryptage, l'authentification utilisateur, le hachage, et le processus d'échange de clés. Un cryptosystème peut utiliser une des ces différentes méthodes selon la politique choisie en fonction des différents trafics de l'utilisateur. ccnp_cch

Tunnel MessageCrypté Infos Infos Cryptage Décryptage VPN - Termes clés • Hachage - Technologie d'intégrité des données qui utilise un algorithme pour convertir un message de longueur variable et une clé secrète en une seule chaîne de caractères de longueur fixe. L'ensemble message/clé et hash traversent le réseau de la source vers la destination. 0 la destination, le hash recalculé est comparé avec le hash reçu. Si les deux valeurs sont identiques, le message n'a pas été corrompu. ccnp_cch

VPN - Termes clés • Authentification - Processus d'dentification d'un utilisateur ou d'un processus tentant d'accéder à une ressource. - L'authentification assure que l'individu ou le processus est bien celui qu'il prétend être. - L'authentification n'attribut pas de droits d'accès• Autorisation - Processus qui donne accès à des ressources à des individus ou à des processus authentifiés.• Gestion de clés - Un clé est généralement une séquence binaire aléatoire utilisée pour exécuter les opérations dans un cryptosystème. - La gestion de clés est la supervision et le controle du processus par lequel les clés sont générées, stockées, protégées, transférées, chargées, utilisées et détruites. ccnp_cch

VPN - Termes clés • Service Autorité de Certificat - Partie tiers de confiance qui aide à la sécurisation des communications entre entités de réseau ou utilisateurs en créant et en affectant des certificats tels des certificats clés-publiques pour des besoin de cryptage. - Une autorité de certificat se porte garant du lien entre les items de sécurité du certificat. Optionnellement une autorité de certificat crée les clés de cryptage. ccnp_cch

IPSEC• Protocoles et éléments clés • Authenticaton Header (AH)• Encapsulation Payload (ESP)• Internet Key Exchange (IKE)• Internet Security Association Key Management Protocol ( ISAKMP)• Security Association (SA)• Authentication, Authorization and Accounting (AAA)• Terminal Access Controller Access Control System Plus (TACACS+)• Remote Authentication Dial-In User Service (RADIUS) ccnp_cch

En-têteIP En-têteIPSec Charge utile IPsécurisé En-têteIP En-têteIP En-têteIPSec En-têteIPSec Charge Utile IPsécurisée Charge Utile IPsécurisée Internetou Réseau Privé Sytèmeavec IPsec Next Header PayloadLength RESERVED Security Parameters Index (SPI) Sequence Number Données authentifiées(Variable) En-têteIP En-têteIP Charge utile IP Charge utile IP Routeuravec IPSec IPSEC• Protocoles et éléments clés Bits 0 8 31 16 • AH (Authentication Header) - Protocole de sécurité qui fournit l'authentification, l'intégrité des données et un service optionnel de détection d'intrusion. AH est dans la charge utile du paquet. ccnp_cch

NouveauEn-tête IP En-têteESP En-têteIP original TCP Données QueueESP AuthESP En-têteIP original En-têteIP original TCP En-têteESP TCP Données Données QueueESP AuthESP IPSEC• Protocoles et éléments clés IPv4 (a) Paquet IP original Authentifié Crypté IPv4 (b) Mode Transport Authentifié Crypté IPv4 (c) Mode Tunnel • ESP (Ancapsulation Security payload) - Protocole de sécurité qui fournit la confidentialité, l'ntégrité des données et des services de protection, deservices optionnels d'authentifiction de l'orogine des données et de détection d'intrusion. ESP encapsule les données à protéger. ccnp_cch

IPSec IPSec Routeur B Routeur A IKE IKE Tunnel IKE IPSEC• Protocoles et éléments clés • IKE (Internet Key Exchange) - Protocole hybride qui implémente l'échange de clés Oakley et l'échange de clés Skeme dans le cadre de ISAKMP. Oakley et Skeme définissent chacun une méthode pour établir un échange de clés authentifié. Ceci inclut la construction de la charge utile, les informations transportées dans la charge utile, l'ordre dans lequel les clés sont traitées et comment elles sont utilisées. ccnp_cch

A B Accèsclient Accèsclient Backbone Opérateur SADB SADB A vers BESP/DES/SHA-1Keys K1,K2,...lifetime=3600sB vers AESP/DES/SHA-1keys K6,K7,...lifetime=3600s A vers BESP/DES/SHA-1Keys K1,K2,...lifetime=3600sB vers AESP/DES/SHA-1keys K6,K7,...lifetime=3600s IPSEC• Protocoles et éléments clés • ISAKMP - (Internet Association and Key Management Protocol) - Un protocol cadre qui définit le format des charge utiles, les mécanismes d'implémentation d'un protocole d'échan,ge de clés et la négociation d'une SA. • SA (Security Association) - Ensemble de principes (politiques) et de clés utilisés pour protéger l'information. La SA ISAKMP est la politique commune et les clés utilisées par les extrémités qui négocient dans ce protocole pour protéger leur communication. ccnp_cch

IPSEC• Protocoles et éléments clés • AAA (Authentication, Authorization and Accounting) - Services de sécurite réseau qui fournissent un cadre de base au travers duquel un controle est activé sur les routeurs et les serveurs d'accès. Deux alternatives majeures pour AAA sont TACACS+ et RADIUS. • TACACS+ (Terminal Access Controller Access Control System Plus) - C'est une application de sécurité qui fournit une validation cantralisée des utilisateurs qui tentent d'obtenir un accès à un routeur ou à un serveur d'accès.• RADIUS (Remote Dial-In User Service) - Un système client serveur distribué qui sécurise les réseaux contre les accès non-autorisés. ccnp_cch

Gestion de clés Gestion Manuelle Echange de clés secètesDiffie-Hellman Echange de clés publiquesAutorité de Certificats Authentification Fonctions de hachage Cryptage SHA MD5 SymétriqueClé secrète:DES, 3DES,AES AsymétriqueClé publique:RSA MAC HMAC(clé secrète) Signaturenumérique(clé publique) Présentation du système de cryptage • Il a de nombreuses technologies de cryptage disponibles pour fournir de la confidentialité • DES (Data Encryption Standard) crypte les paquets avec une clé d'une longueur de 56 bits.• A sa création dans les années 1970, DES paraissait inviolable.• Aujourd'hui avec de super-ordinateurs, le cryptage DES peut être décodé en quelques jours.• ccnp_cch

Gestion de clés Gestion Manuelle Echange de clés secètesDiffie-Hellman Echange de clés publiquesAutorité de Certificats Authentification Fonctions de hachage Cryptage SHA MD5 SymétriqueClé secrète:DES, 3DES,AES AsymétriqueClé publique:RSA MAC HMAC(clé secrète) Signaturenumérique(clé publique) Présentation du système de cryptage • 3DES utilise une clé d'une longueur de 168 bits et exécute trois opérations DES en séquence.• 3DES est 256 fois plus fiable que DES. AES (Advanced Encryption Standard) spécifie des clés de longueurs 128, 192 ou 256 bits pour crypter des blocs de 128, 192 ou 256 bits ( Les 9 combinaisons de tailles de clés et de tailles de blocs sont possibles).• Cisco prévoit que AES sera disponible sur tous les produits Cisco qui les fonctionnalités IPSec DES/3DES tels les routeurs avec IOS, les PIX Cisco, les concentrateurs VPN Cisco et les clients VPN Cisco.• ccnp_cch

Présentation du système de cryptage Gestion de clés Gestion Manuelle Echange de clés secètesDiffie-Hellman Echange de clés publiquesAutorité de Certificats Authentification Fonctions de hachage Cryptage SHA MD5 SymétriqueClé secrète:DES, 3DES,AES AsymétriqueClé publique:RSA MAC HMAC(clé secrète) Signaturenumérique(clé publique) • Plusieurs standards ont émergé pour protéger le secret des clés et faciliter le changement de ces clés.• L'algorithme Diffie-Hellman implémente l'échange de clés sans échanger les clé réelles.• C'est l'algorithme le plus connu et le plus utilsé pour établier des sessions de clés pour crypter des données. ccnp_cch

Présentation du système de cryptage Gestion de clés Gestion Manuelle Echange de clés secètesDiffie-Hellman Echange de clés publiquesAutorité de Certificats Authentification Fonctions de hachage Cryptage SHA MD5 SymétriqueClé secrète:DES, 3DES,AES AsymétriqueClé publique:RSA MAC HMAC(clé secrète) Signaturenumérique(clé publique) • Plusieurs techniques fournissent l'authentification dont MD5 (Message Digest 5) et SHA (Secure Hash Algorithm). ccnp_cch

Clé secrètepartagée Clé secrètepartagée MessageCrypté Infos Infos Cryptage Décryptage Cryptage • Cryptage symétrique • Cryptage symétrique ou cryptage à clé secrète• Utilisé pour de grands volumes de données. • Durant l'échange, les clés peuvent changer plusieurs fois. • Cryptage asymétrique ou cryptage à clé publique tel RSA demande beaucoup plus de ressources CPU aussi il est utilisé uniquement pour l'échange de clés. ccnp_cch

Clé secrètepartagée Clé secrètepartagée MessageCrypté Infos Infos Cryptage Décryptage Cryptage • Cryptage symétrique • La caractéristique la plus importante d'un algorithme de cryptogaphie est sa robustesse aux attaques de décryptage. • La sécurité d'un crypto-système ou le degré de difficulté pour retrouver l'information originale est fonction de plusieurs variables. - Beaucoup de précautions sont prises pour protéger le secret de la clé. • Dans la majorité des protocoles le secret de la clé utilisée pour crypter est la base de la sécurité. ccnp_cch

Clé secrètepartagée Clé secrètepartagée MessageCrypté Infos Infos Cryptage Décryptage Cryptage • Cryptage symétrique • DES (Digital Encryption Standard) est un des standards de cryptage les plus utilisés.• Les clés permettent de crypter et de décrypter. • 3DES (Triple DES) est une alternative à DES qui préserve les investissements existants et rend les attaques de type "force-brute" plus difficiles.• 3DES peut utiliser une, deux ou trois clés différentes. ccnp_cch

Cryptage • Cryptage asymétrique • La clé privée est connue uniquement par le receveur• La clé publique est connu par le public• La distribution de la clé publique n'est pas sécrète Clé privéedu receveur Clé publiquedu receveur MessageCrypté Infos Infos Cryptage Décryptage • Cryptage asymétrique ou à clé publique • Le même algorithme ou des algorithmes complémentaires peuvent être utilisés pour crypter et décrypter les données. • Deux clés sont requises : Une clé publique et une clé privée. elles sont différentes mais elles sont liées par une relation mathématique. • Chaque extrémité doit avoir sa paire clé publique/clé privée ainsi des clés différentes seront utilisées pour crypter et décrypter. ccnp_cch

Clé privéedu receveur Clé publiquedu receveur MessageCrypté Infos Infos Cryptage Décryptage Cryptage • Cryptage asymétrique • Les mécanismes utilisés pour générer les paires de clés sont complexes. Le résultat de la génération consiste en deux très grands nombres aléatoires.• Les deux nombres ainsi que leur produit doivent satisfaire à des critères mathématiques stricts pour garantir l'unicité de la paire clé publique/clé privée. • Les algorithmes de crytage à clé publique sony utilisé typiquement pour des applications d'authentification incluant la signature numérique et la gestion de clés.• Les algorithmes les plus connus sont les algorithmes RSA (Rivest, Shamir, Adleman) et El Gamal. ccnp_cch

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From satire to satire: how gen z is revamping the legacy of “death by powerpoint”.

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Fourteen years ago, Don McMillan, a Silicon Valley electrical engineer, recorded a YouTube video called “Life after Death by PowerPoint,” in which—as the title clearly states—he satirized the excesses and abuses of business presentation slides. In a key scene, McMillan says, “Here are the common PowerPoint® mistakes. Number One: People tend to put every word they are going to say on their PowerPoint® slides. Although this eliminates the need to memorize your talk, ultimately this makes your slide crowded, wordy, and boring. You will lose your audience’s attention before you even reach the bottom of your uh—first slide.”

What makes the scene funny is that every word McMillan speaks is on his slide, and that he reads them verbatim with his eyes glued to the screen and his back turned to his audience.

The video has amassed more than four million views and launched McMillan into a successful career as a professional comedian performing at corporate events.

Over the years, McMillan’s satirical campaign against the abuses and excesses of PowerPoint was picked up by New Yorker Magazine cartoons. One of the best, by Alex Gregory , shows the Devil interviewing an assistant and saying, “I need someone well-versed in the art of torture—do you know PowerPoint?”

Flash forward to last week when the Wall Street Journal ran a front page story titled, “Nothing Says ‘Party!’ to Gen Z Quite Like a 50-Deck PowerPoint and a Remote Clicker,” that describes a new trend in which the young generation uses the software to create presentations about frivolous—and therefore humorous—subjects. The authors of the story, WSJ Reporting Interns Sanvi Bangalore and Milla Surjadi, Gen Zers themselves, report that many of their peers “are amused by the irony of using professional technology to present NSFW content.” Bangalore and Surjadi call the trend “comedic ammo” because it used parody as criticism, just as McMillan did.

The reason that these abuses and excesses have persisted for so long can be traced back to the days before PowerPoint (as well as Google Slides and Keynote) and even before 35mm slides when presentations were done on flip charts. Those large cumbersome sheets mounted on rickety easels became the center of attention as a large surface that all the participants could see and share; but it also served to document the ideas that could later be copied and distributed to others who did not attend the session. In their earliest incarnation then, the flip chart served two purposes: as a display during the meeting and as a record capable of duplication and distribution after the meeting.

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Thus, was born the “Twofer”—a mismatched conflation of a display and a document— composed of overloaded slides and inadequate documents. The dysfunctional practice persists despite years of “Death by PowerPoint” jokes and satire. Old habits die hard. Clearly the solution is to separate the functions by creating two entities: a simple headline for display in PowerPoint (or other slide software) and separate documents to record and distribute done with Word (or other word processing software).

The Gen Zers, who became fluent with PowerPoint during their childhoods, are now entering the workforce and creating slides for more senior people to present. Let’s hope that their skills, their satire, and their parties can break the mold.

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