X hits on this document

Powerpoint document

Virtual Private Networks (VPN) - page 6 / 21

84 views

0 shares

0 downloads

0 comments

6 / 21

http://sce.uhcl.edu/yang/teaching/.../VPN.ppt

6

VPNs at different OSI layers

The layer where VPN is constructed affects its functionality.

Example: In encrypted VPNs, the layer where encryption occurs determines

(i)

how much traffic gets encrypted

(ii)

the level of transparency for the end users

Data link layer VPNs (Layer-2)

Example protocols: Frame Relay, ATM

Drawbacks:

Expensive - Requires dedicated Layer 2 pathways

may not have complete security – mainly segregation of the traffic, based on types of Layer 2 connection

Q: Is L2TP a layer 2 VPN?

Document info
Document views84
Page views84
Page last viewedTue Jan 17 06:13:15 UTC 2017
Pages21
Paragraphs353
Words1851

Comments