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Question 20 of 77
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Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
D is the correct answer. The question is position from a Cloud Router's perspective. That said, Cloud Routers do not support Local Preference. Google Cloud Router's Perspective (Outbound from GCP to On-prem): To make Google Cloud prefer one Cloud Router over another for traffic from GCP to on-prem, Google Cloud Router uses the Advertised Route Priority, which is implemented as the Multi-Exit Discriminator (MED) BGP attribute. You configure a "base priority" (which translates to the MED value) on the BGP session of your Cloud Router. A lower MED value indicates a higher priority. So, for the active Cloud Router, you'd set a lower MED (higher priority), and for the standby, a higher MED (lower priority).
The correct answer is D. Multi-exit Discriminator (MED). MED helps control which Cloud Router is preferred for outbound traffic, making one router active and the other standby.
MED is sent in the advertisements from an external AS (GCP here) to suggest to the neighbour what path the external AS prefers. Local preference is used to set from your own perspective (here on-prem) which path to prefer to a destination. Therefore, local preference is correct here.