پاورپوینت با عنوان Virtual Private Network

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تعداد صفحه : 65 صفحه

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Virtual Private Network In the Name of Allah Virtual Private Networks Introduction What security problems do VPNs solve ? What security problems are not solved by VPNs ? VPN Principles of operation: tunneling, encapsulation, encryption and authentication VPN Technologies: Microsoft PPTP, L2TP and IPsec History and background of VPNs 1 Internet multi-site organisations operated private networks using leased lines. This approach was expensive and inflexible. It became cheaper to use shared Internet than dedicated. Virtual Private Network is a type of private network that uses public telecommunication, such as the Internet, instead of leased lines to communicate VPNs enabled more flexible use of larger networks by removing network geography constraints from shared-insider LAN/Intranet associations and services. With cryptography as part of a VPN, a travelling saleseman could communicate with head office at lower risk from spying competitors etc. What problems do VPNs solve ? Avoiding costs of fixed lines. Extending security context of LAN across sites, regardless of geography, including to mobile users. Authentication: knowing who your users are. Encryption: preventing monitoring of use of insecure client server applications at the network level. What security problems do VPNs not solve ? Having a VPN which isn't secure and not knowing this is probably worse than having no VPN Traffic analysis: monitoring of packet sizes, network usage times, endpoints of conversation etc. VPNs can be used to pierce firewalls, by encapsulating traffic prohibited by organisation policy within a firewalled perimeter which the firewall can't inspect or control.