QuestionQ48

IPsec and VPNs

You are setting up a VPN using IKE between headquarters and a branch office with a dynamic public IP address. Which IKE mode should be used?

  • A quick mode
  • B main mode
  • C aggressive mode
  • D wizard mode
Explanation

Aggressive Mode supports IKEv1 Phase 1 negotiation when the peer has a dynamic public IP address. It identifies the peer during the shorter initial exchange, whereas Main Mode requires both peers to use static IP addresses in this configuration.

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