Which mode of IPSec should you use to assure security and confidentiality of data within the same LAN?

A.
ESP transport mode

B.
AH permiscuous

C.
ESP confidential

D.
AH Tunnel mode

Explanation:
When transport mode is used, IPSec encrypts only the IP payload. Transport mode provides the protection of
an IP payload through an AH or ESP header. Encapsulating Security Payload (ESP) provides confidentiality (in
addition to authentication, integrity, and anti-replay protection) for the IP payload.
Incorrect Answers:
B: Authentication Header (AH) provides authentication, integrity, and anti-replay protection for the entire packet
(both the IP header and the data payload carried in the packet). It does not provide confidentiality, which means
that it does not encrypt the data.
https://technet.microsoft.com/en-us/library/cc739674(v=ws.10).aspx