JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing (2022) — Question 36

Which two statements are correct about the BGP MED attribute? (Choose two.)

Answer options

• A. BGP uses the MED value when peering to two or more connections to the same upstream AS
• B. BGP routes require the MED attribute be defined
• C. BGP uses the MED value when peering to two different upstream ASs
• D. BGP assumes the MED value to be 0, if not already defined

Correct answer: A, D

Explanation

The correct answer is A and D. Option A is correct because BGP does consider the MED value when there are multiple connections to the same upstream AS, helping to determine routing preferences. Option D is accurate because if the MED attribute is not set, BGP defaults it to 0. Options B and C are incorrect; BGP routes do not require the MED attribute to be defined, and the MED is not used for different upstream ASs.