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Your manager requires you to setup a VPN to a new business partner site. The administrator from the partner si

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?

A. The two algorithms do not have the same key length and so dont work together. You will get the error -¦ No proposal chosen-¦

B. All is fine as the longest key length has been chosen for encrypting the data and a shorter key length for higher performance for setting up the tunnel.

C. Only 128 bit keys are used for phase 1 keys which are protecting phase 2, so the longer key length in phase 2 only costs performance and does not add security due to a shorter key in phase 1.

D. All is fine and can be used as is.

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