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PROFESSIONAL-CLOUD-NETWORK-ENGINEER · Question #211

Your company's cloud network has hybrid connectivity to an on-premises environment through Cloud Interconnect in two regions (us-east4 and us-west1). You received complaints that some on-premises…

The correct answer is A. Query the dynamic_routes/learned_routes/dropped_unique_destinations metric and review the. Google Cloud's Cloud Router has a limit on the number of dynamic routes it can learn per VPC. When this limit is exceeded, routes are silently dropped. The metric 'dynamic_routes/learned_routes/dropped_unique_destinations' reports the count of route destinations that were…

Submitted by kavita_s· Apr 18, 2026Configuring network services

Question

Your company's cloud network has hybrid connectivity to an on-premises environment through Cloud Interconnect in two regions (us-east4 and us-west1). You received complaints that some on-premises destinations are no longer reachable from us-east4, after changes were made to advertise additional routes to us-west1. You need to troubleshoot to see if any routes were dropped. What should you do?

Options

  • AQuery the dynamic_routes/learned_routes/dropped_unique_destinations metric and review the
  • BQuery the dynamic_routes/learned_routes/unique_destinations_limit metric and review the global
  • CQuery the dynamic_routes/learned_routes/any_dropped_unique_destinations metric and review
  • DQuery the dynamic_routes/learned_routes/dropped_unique_destinations metric and review the

How the community answered

(31 responses)
  • A
    84% (26)
  • B
    10% (3)
  • C
    3% (1)
  • D
    3% (1)

Explanation

Google Cloud's Cloud Router has a limit on the number of dynamic routes it can learn per VPC. When this limit is exceeded, routes are silently dropped. The metric 'dynamic_routes/learned_routes/dropped_unique_destinations' reports the count of route destinations that were dropped due to exceeding the dynamic route limit. Option A correctly identifies this metric and suggests reviewing the regional breakdown (us-east4) to determine if routes to specific on-premises destinations were dropped after additional routes were advertised to us-west1. Option B references 'unique_destinations_limit', which is a capacity metric, not a dropped-routes metric. Option C references 'any_dropped_unique_destinations', which is a boolean indicator (any vs. none), not the count. Option D is structurally similar to A but reviews a different scope, making A the most precise choice for diagnosing the us-east4 issue.

Topics

#Cloud Interconnect#Hybrid Networking#Troubleshooting#Network Monitoring

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