What are three valid BGP message types? (Choose three.)
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BGP (Border Gateway Protocol) is a routing protocol used to exchange routing information between different autonomous systems (AS). BGP uses a variety of message types to communicate between BGP speakers. Here are the explanations of the three valid BGP message types:
Open: The Open message is sent when a BGP speaker establishes a new session with another BGP speaker. The message includes information about the sender's BGP capabilities and the parameters of the BGP session.
Update: The Update message is used to announce new routes, update existing routes, or withdraw routes. The message contains information about the prefix being advertised or withdrawn, as well as other attributes that describe the route.
Keepalive: The Keepalive message is used to maintain the BGP session between two BGP speakers. It is sent periodically by both peers to ensure that the connection remains active. The Keepalive message contains no data and only serves as a confirmation that the connection is still alive.
Note that Refresh, Hello, and Route are not valid BGP message types. "Refresh" is not a BGP message type but rather a BGP feature that allows a router to request updates for a specific set of prefixes. "Hello" is a message type used in other routing protocols such as OSPF and EIGRP, but not in BGP. "Route" is not a message type but rather a term used to refer to the prefix and associated attributes being advertised or withdrawn in the Update message.