Which fields are carried in the MP-BGP OPEN message?
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Correct answer: The version number and the AS number to which the router belongs.
Why this is the answer
The BGP OPEN message is the first message exchanged between BGP peers to establish a BGP session. It carries fundamental information for session setup, including the BGP version number being used by the sending router and its Autonomous System (AS) number. This allows the receiving router to verify compatibility and determine if it should accept the peering request. Incorrect options describe information typically found in UPDATE messages (IP routing information, NLRI, path attributes) or are not directly part of the OPEN message's primary function (MPLS labels). While IP addresses are involved in TCP session establishment, they are not fields within the BGP OPEN message itself.
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