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单项选择题 Refer to the exhibit. The Linksys router in the diagram is performing pNAT (port network address translation). What hash algorithm should you choose and why?（）

A、Use hash MD5 to ensure that IKE works through NAT. 

B、Use ah-sha-hmac, as it does not check the integrity of the IP header. The IP header will change due to NAT. 

C、Use 3DES, as it will encrypt the IPSec header IP addresses and bypass addressing issues. 

D、Use esp-sha-hmac, as it does not check the integrity of the IP header. The IP header will change due to NAT.

  • C

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