H12-821_V1.0 · Question #966
BGP uses TCP as the transport layer protocol, TCP port number (___). BGP sessions between routers are established based on TCP connections.
The correct answer is A. 179. BGP (Border Gateway Protocol) is standardized to use TCP port 179, as defined in RFC 4271, making option A correct. This port number is reserved specifically for BGP and is how routers identify and accept BGP connection requests from peers. Options B, C, and D are blank in this…
Question
Options
- A179
- B
- C
- D
How the community answered
(26 responses)- A73% (19)
- B15% (4)
- C4% (1)
- D8% (2)
Explanation
BGP (Border Gateway Protocol) is standardized to use TCP port 179, as defined in RFC 4271, making option A correct. This port number is reserved specifically for BGP and is how routers identify and accept BGP connection requests from peers. Options B, C, and D are blank in this question, meaning there are no distractors to evaluate - the question is essentially asking for recall of a specific well-known port assignment. Since only one valid answer is presented, the focus is purely on knowing the correct port number.
Memory tip: Associate 179 with BGP by noting that BGP is the protocol that connects the internet's autonomous systems, and 179 is just one below 180 - think "BGP keeps the internet from going 180 degrees off course."
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