Question

If IPSec offers automatic protection requiring no user involvement, why hasn’t it completely replaced SSL/TLS?

The AH and ESP protocols can each be used in either transport mode or tunnel mode. This gives four distinct possibilities. Can you give an example of the application of each of the four? When would you use each protocol in each mode?

IPsec is commonly used to construct virtual private networks (VPNs). This prevents “internal” communications from being observed by potential Internet eavesdroppers. Can you think of any reason to establish an internal IPsec connection (i.e. one that protects traffic that does not go outside the firewall)?

A host receives an authenticated packet with the sequence number 208. The replay window spans from 200 to 263. What will the host do with the packet?

A host receives an authenticated packet with the sequence number 270. The replay window spans from 200 to 263. What is the window span after this event?

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1.
If IPSec offers automatic protection requiring no user involvement, why hasn’t it completely replaced SSL/TLS?

There are several reasons for which IPSec didn’t replace (yet) SSL/TLS.
First of all, IPSec deals with only fixed connection types, while SSL/TLS is also used for mobile connections. IPSec is used for bridged trusted connections, while SSL needs flexibility and also deals with untrusted and unmanaged connections. Thus IPSec is used for site-to-site and SSL for remote purposes....

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