Which of the following are among the six attributes used in the BGP Selection Process?

• A. Origin Code; AS-Path; Next-Hop; MED
• B. Origin Code; AS-Path; Next-Hop; MED; Local Preference; Weight
• C. Origin Code; AS-Path; Next-Hop
• D. Origin Code; AS-Path; Local Preference; Weight

Answer: (B)

In BGP, when there are multiple possible routes to the same prefix, the router decides the best path by weighing a specific set of attributes that describe each path. The six attributes used in this best-path decision are Weight, Local Preference, Origin, AS_PATH, Multi-Exit Discriminator (MED), and Next Hop. Weight is Cisco-specific and local to the router, while Local Preference is shared within the AS to indicate which exit point is preferred. Origin shows how the route was learned (IGP, EGP, or incomplete), AS_PATH reveals the sequence of ASes the route traversed, MED provides a hint for inbound traffic from neighboring ASes, and Next Hop identifies the next router toward the destination.

The correct option lists all six: Weight, Local Preference, Origin, AS_PATH, MED, and Next Hop. The other choices miss one or more of these, such as omitting Weight or Local Preference, and thus don’t represent the complete set used in the BGP selection process.