What is the BGP path-attribute preference order from most preferred to least preferred used by the best-path algorithm?
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Correct answer: weight, local preference, AS path, MED.
Why this is the answer
The BGP best-path algorithm uses a specific order of path attributes to determine the optimal route. The correct order, from most preferred to least preferred, is: Weight, Local Preference, ASPATH, and Multi-Exit Discriminator (MED). Weight is a Cisco-proprietary attribute and is always evaluated first. Local Preference is then used to prefer paths within an Autonomous System (AS). ASPATH length is next, with shorter paths being preferred. Finally, MED is used to influence how traffic enters an AS from a neighboring AS. The other options present incorrect orders of these critical BGP path attributes.
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