BGP is an exterior gateway protocol and uses what for its metrics?

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Multiple Choice

BGP is an exterior gateway protocol and uses what for its metrics?

Explanation:
BGP determines the best exterior-path to a destination primarily by the length of the AS_PATH. The AS_PATH is a record of the autonomous systems the route has traversed, so fewer AS hops means a shorter path. This helps avoid routing loops and generally points to a more direct interdomain route. While operators can influence routing with policies (like local preference or MED), those are policy controls rather than the default metric. Other concepts mentioned, such as hop count-based metrics (typical of RIP) or bandwidth-based costs, aren’t the built-in exterior-mpath criterion in BGP.

BGP determines the best exterior-path to a destination primarily by the length of the AS_PATH. The AS_PATH is a record of the autonomous systems the route has traversed, so fewer AS hops means a shorter path. This helps avoid routing loops and generally points to a more direct interdomain route. While operators can influence routing with policies (like local preference or MED), those are policy controls rather than the default metric. Other concepts mentioned, such as hop count-based metrics (typical of RIP) or bandwidth-based costs, aren’t the built-in exterior-mpath criterion in BGP.

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