Which one of the following operations of a secure communication session cannot be protected?

A.
Session initialization

B.
Session support

C.
Session termination

D.
Session control

Explanation:
Session control is protected (Cisco –
http://www.cisco.com/en/US/prod/collateral/vpndevc/ps5708/ps5710/ps1018/product_data_sheet
0 9186a0080117962.html) Session initialization is protected (protection against SYN attacks/DoS)
Session termination is protected – they terminate idle connection so they don’t consume resources
So, by the process of elimination, the correct answer is ‘session support’.