What port and protocol does BGP use for transport, and what is a key attribute used to influence path selection?

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Multiple Choice

What port and protocol does BGP use for transport, and what is a key attribute used to influence path selection?

Explanation:
BGP runs over TCP, using port 179 for its sessions. The AS_PATH attribute records the sequence of autonomous systems a route has traversed and is used to influence path selection. Routers prefer routes with shorter AS_PATHs, which helps choose shorter interdomain paths and prevents routing loops. While other attributes like MED or LOCAL_PREF also affect decisions in certain contexts, AS_PATH length is a fundamental factor used to compare routes across different ASes.

BGP runs over TCP, using port 179 for its sessions. The AS_PATH attribute records the sequence of autonomous systems a route has traversed and is used to influence path selection. Routers prefer routes with shorter AS_PATHs, which helps choose shorter interdomain paths and prevents routing loops. While other attributes like MED or LOCAL_PREF also affect decisions in certain contexts, AS_PATH length is a fundamental factor used to compare routes across different ASes.

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