Google Professional Cloud Network Engineer Question 676
Single answerGoogle Cloud PlatformYou are configuring a hybrid network between your on-premises data center and Google Cloud using Cloud Router with Border Gateway Protocol (BGP). You notice that some routes from your on-premises network are being prioritized over routes from other peers, even though they have the same destination prefix. Which BGP attribute can you configure on your Cloud Router to adjust the priority of routes and ensure more predictable path selection?
- A
Multi-Exit Discriminator (MED)
- B
Autonomous System Number (ASN)
- C
BGP Link-Local Address
- D
BGP Community Tags
Show answer and explanation
Correct answer: A
Explanation
In BGP, the Multi-Exit Discriminator (MED) attribute is used to influence the priority of routes when multiple paths exist to the same destination. By configuring MED on your Cloud Router, you can adjust the priority of routes received from on-premises or other peers, ensuring predictable path selection. Other attributes like ASN, link-local addresses, and community tags serve different purposes within BGP and do not directly control route priority.
- A. Correct.
Multi-Exit Discriminator (MED) is a BGP attribute used to influence the path selection process by assigning a priority to routes. A lower MED value is preferred, making it the correct attribute to adjust the priority of routes.
- B. Incorrect.
Autonomous System Number (ASN) is used to identify the BGP peer and is not directly relevant to route prioritization.
- C. Incorrect.
BGP Link-Local Address is used for IPv6 peering between routers and does not influence route priority.
- D. Incorrect.
BGP Community Tags are used for grouping routes and applying policies but do not directly affect route priority.