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156-215.77 · Question #250

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 D. Only 128 bit keys are used for phase 1 keys which are protecting phase 2, so the longer key. 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
  • BAll is fine and can be used as is.
  • CThe two algorithms do not have the same key length and so don't work together. You will get the
  • DOnly 128 bit keys are used for phase 1 keys which are protecting phase 2, so the longer key

How the community answered

(53 responses)
  • A
    13% (7)
  • B
    4% (2)
  • C
    8% (4)
  • D
    75% (40)

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