I believe it is B and C by process of elimination. Since A is a characteristic of aggressive mode and that is not the question, and D is not mentioned in the curriculum. C is definitely a valid difference, but B is the only one left, even though it is a configurable feature in both modes.
A and C are correct
Peer ID is included in the initiating packet - Aggressive Mode // in Main mode is included in the packet 5.
Main mode 6 packets // Aggresive mode only three
what b says is correct but it is not a difference between the two modes, you can enable Xauth in both modes, is a phase 1.5.
Page 177-178
But peer ID is included on both Main and Aggressive mode.
MM= Peer ID + Main Mode + Certificate Signature
AM= Peer ID+ Aggressive Mode + PSK
This infor is from SDWAN Slide on fortinet site. So correct ans is BC
This peer ID
This option is available when Aggressive Mode is enabled. Enter the identifier that is used to authenticate the remote peer. This identifier must match the Local ID that the remote peer’s administrator has configured.
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