Which of the following fields make up the header of an ESP packet? (Select 2 choices.)

Last Updated on August 4, 2021 by Admin 3

Which of the following fields make up the header of an ESP packet? (Select 2 choices.)

  • Next Header
  • Pad Length
  • Padding
  • Security Parameter Index
  • Sequence Number
Explanation:
The Security Parameter Index (SPI) and Sequence Number fields make up the header of an Encapsulating Security Payload (ESP) packet. ESP is an IP Security (IPSec) protocol that provides data integrity and confidentiality for IP traffic. The ESP header is always part of the authenticated data in an ESP packet, but the ESP header itself is never encrypted. By contrast, the ESP trailer, which is made up of the Padding, Pad Length, and Next Header fields, is always part of the authenticated data and is always encrypted. The following diagram illustrates the ESP packet format:

300-735 Part 09 Q05 082
300-735 Part 09 Q05 082

ESP can operate in transport mode or tunnel mode. In transport mode, ESP encrypts only the original payload data and the resultant ESP trailer, leaving the original IP header unencrypted. The following diagram illustrates the components of an ESP packet in transport mode:

300-735 Part 09 Q05 083
300-735 Part 09 Q05 083

In tunnel mode, ESP encrypts the entire packet, including the original IP header, the original payload data, and the resultant ESP trailer. The following diagram illustrates the components of an ESP packet in tunnel mode:

300-735 Part 09 Q05 084
300-735 Part 09 Q05 084
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