Multiple choice technology

On what destination port in the layer 4 header does BGP listen?

  1. UDP port 169

  2. TCP port 169

  3. UDP port 179

  4. TCP port 179
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D Correct answer
Explanation

BGP uses TCP as its reliable transport protocol and listens on port 179. This is a well-known standard port number for BGP connections. UDP is not used for BGP because it requires reliable, ordered delivery of routing updates, which TCP provides. Port 169 is not associated with BGP.

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