An IPsec tunnel between a branch router and the NIDA data centre fails to form, and debug output shows phase 1 proposals do not match. Which phase must agree first before any traffic is protected?
Answers
APhase 1, ISAKMP, which negotiates the secure channel and authenticates the peers
BPhase 2, which negotiates the encryption and hashing algorithms
CThe NAT traversal negotiation stage
DThe IKE keepalive stage
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