Which three security concerns can be addressed by a tunnel mode IPsec VPN secured by AH?
(Choose three.)
A.
data integrity
B.
data confidentiality
C.
data authentication
D.
outer IP header confidentiality
E.
outer IP header authentication
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http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/IPSec_Over.html#wp999915
The AH protocol (IP protocol 51) forms the other part of IPsec. The AH does not encrypt data in the usual sense, by hiding the data, but it adds a tamper-evident seal to the data. It also protects the non-mutable fields in the IP header carrying the data, which includes the address fields of the IP header. The AH protocol should not be used alone when there is a requirement for data confidentiality.
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