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Virtual Private Networks (VPN) - page 6 / 21

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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?

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