H12-821_V1.0 · Question #795
In BGP routing rules, routes with higher MED values are given priority.
The correct answer is B. FALSE. B is correct because in BGP, the Multi-Exit Discriminator (MED) attribute follows a "lower is better" preference - a route with a MED of 50 is preferred over one with a MED of 200, all else being equal. Higher MED values indicate a less preferred path into an AS, not a more…
Question
Options
- ATRUE
- BFALSE
How the community answered
(18 responses)- A28% (5)
- B72% (13)
Explanation
B is correct because in BGP, the Multi-Exit Discriminator (MED) attribute follows a "lower is better" preference - a route with a MED of 50 is preferred over one with a MED of 200, all else being equal. Higher MED values indicate a less preferred path into an AS, not a more preferred one.
Why A is wrong: The MED attribute works inversely to what the statement claims. It's commonly used by an AS to signal to neighboring ASes which entry point it prefers for inbound traffic, and a lower value wins that comparison.
Memory tip: Think of MED like a road toll - the lower the toll (cost), the more you prefer that route. "Lower MED = cheaper path = preferred." This also aligns with how BGP's overall best-path selection generally favors lower metrics (weight, local preference are higher-is-better, but MED is the exception that flips the rule, which is exactly why it's a common exam trap).
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