Use of IPSEC in tunnel mode results in
B option.
https://technet.microsoft.com/en-us/library/cc737154(v=ws.10).aspx
answer is B
IPSEC: protocols to provide security for packets in network layer
Transport mode
Tunnel mode
The IPSec header and trailer are added to the information coming from the transport layer. The IP header is added later.
It takes an IP packet, including the header, applies IPSec security methods to the entire packet, and then adds a new IP header.
It assures host-to-host (end-to-end) protection.
Tunnel mode is normally used between two routers.
Does not protect the IP header;
Protects the original IP header.
In IPSEC encryption ,Header as well as data will be encrypted each time so we add new header.
ans is (b)
When IPSec tunnel mode is used, IPSec encrypts the IP header and the payload, whereas transport mode only encrypts the IP payload. Tunnel mode provides the protection of an entire IP packet by treating it as an AH or ESP payload.
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