Assuming the shown data packet is to be protected by AH (Authentication Header) in transport mode, which of the following correctly describes the packet structure after AH is applied?
A.
Option A
B.
Option B
C.
Option C
D.
Option D
Explanation:
Not B: The QUESTION NO: is about transport mode. In transport never a new IP hdr is put in front of the AH header.Note:
The following diagram illustrates AH transport mode positioning for a typical IPv4 packet, on a “before and after” basis.The following diagram illustrates AH transport mode positioning for a typical IPv6 packet.
The following diagram illustrates AH tunnel mode positioning for typical IPv4 and IPv6 packets.
http://www.faqs.org/rfcs/rfc2402.html
See RFC 2402