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Use of IPSEC in tunnel mode results in

  1. IP packet with same header
  2. IP packet with new header
  3. IP packet without header
  4. No changes in IP packet
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what is wrong with option d no change in ip packet (it is true na original packet is ot effected )
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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.

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@shiva u mean in treansport mode we dont need to add new ip  header
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In IPSEC encryption ,Header as well as data will be encrypted each time so we add new header.Image result for ipsec tunnel diagram

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ans is (b)

When IPSec tunnel mode is usedIPSec 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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