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CISSP study material · question 284 of 500

How does ESP provide limited traffic flow confidentiality, and where is that most useful?

  1. By multiplexing several flows into one association, mainly at internet exchanges.
  2. By randomising source addresses, mainly on shared media networks.
  3. By concealing packet length and making dummy packets cheap to generate and discard, mainly in virtual private network and overlay deployments.
  4. By padding every packet to the path maximum transmission unit, mainly on wireless links.
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Answer: C. By concealing packet length and making dummy packets cheap to generate and discard, mainly in virtual private network and overlay deployments.

With confidentiality enabled ESP can conceal packet length and generate and discard dummy packets cheaply, which helps mainly in virtual private network and overlay contexts.

Source: RFC 4301 (IETF) — RFC 4301 > 3.2 How IPsec Works

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