Two VPN peers are negotiating IKE phase 1 using main mode. Which message pair in the
negotiation contains the phase 1 proposal for the peers?
A.
message 1 and 2
B.
message 3 and 4
C.
message 5 and 6
D.
message 7 and 8
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http://www.juniper.net/techpubs/software/junos-security/junos-security95/junos-security-swconfig-security/ipsec-vpn-overview.html#id-56995
First exchange (messages 1 and 2—Propose and accept the encryption and authentication algorithms.
Second exchange (messages 3 and 4—Execute a Diffie-Hellman exchange, and the initiator and recipient each provide a pseudo-random number.
Third exchange (messages 5 and 6)—Send and verify their identities.
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