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156-215.71 · Question #317

Your manager requires you to setup a VPN to a new business partner site. The administrator from the partner site gives you his VPN settings and you notice that he setup AES 128 for IKE phase 1 and…

The correct answer is C. Only 128 bit keys are used for phase 1 keys which are protecting phase 2, so the longer key length in. See the full explanation below for the reasoning.

Question

Your manager requires you to setup a VPN to a new business partner site. The administrator from the partner site gives you his VPN settings and you notice that he setup AES 128 for IKE phase 1 and AES 256 for IKE phase 2. Why is this a problematic setup?

Options

  • AAll is fine as the longest key length has been chosen for encrypting the data and a shorter key length
  • BAll is fine and can be used as is.
  • COnly 128 bit keys are used for phase 1 keys which are protecting phase 2, so the longer key length in
  • DThe 2 algorithms do not have the same key length and so don't work together. You will get the error "

How the community answered

(17 responses)
  • A
    18% (3)
  • C
    76% (13)
  • D
    6% (1)

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