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PROFESSIONAL-CLOUD-NETWORK-ENGINEER · Question #185

You have two VPCs: VPC A in Project A and VPC B in Project B. The VPCs are peered, and each VPC has VM instances in four zones. You are using the Network Intelligence Center Performance Dashboard to i

The correct answer is B. Ensure that each zone in each of the VPC networks has at least 9 compute instances. Look in. Option B is correct because Google Cloud's Network Intelligence Center Performance Dashboard requires a minimum of 9 VM instances per zone to achieve a 90% confidence level for packet loss metrics - and since traffic originates in VPC A (Project A), you must view the Performance

Submitted by fatema_kw· Apr 18, 2026Configuring network services

Question

You have two VPCs: VPC A in Project A and VPC B in Project B. The VPCs are peered, and each VPC has VM instances in four zones. You are using the Network Intelligence Center Performance Dashboard to investigate the packet loss for traffic flows that start in VPC A and terminate in VPC B. You need the reported packet loss metric to have at least a 90% confidence level. What should you do?

Options

  • AEnsure that each zone in each of the VPC networks has at least 10 compute instances. Look in
  • BEnsure that each zone in each of the VPC networks has at least 9 compute instances. Look in
  • CEnsure that each zone in each of the VPC networks has at least 9 compute instances. Look in
  • DEnsure that each zone in each of the VPC networks has at least 10 compute instances. Look in

How the community answered

(47 responses)
  • A
    2% (1)
  • B
    89% (42)
  • C
    2% (1)
  • D
    6% (3)

Explanation

Option B is correct because Google Cloud's Network Intelligence Center Performance Dashboard requires a minimum of 9 VM instances per zone to achieve a 90% confidence level for packet loss metrics - and since traffic originates in VPC A (Project A), you must view the Performance Dashboard from Project A's perspective to see those flows accurately reported.

Options A and D (10 instances) are wrong on the instance count: while 10 instances yields a higher confidence tier (≈99%), the question only requires 90%, so specifying 10 as the minimum is imprecise and misleads toward a stricter-than-needed requirement. Option C has the correct instance threshold (9) but directs you to look in the wrong project - for flows originating in VPC A, the source project's dashboard is authoritative; viewing from VPC B's project would show that traffic as inbound, not giving you the source-side packet loss data you need.

Memory tip: Link "9 instances = 90% confidence" - the digit 9 appears in both, making the threshold easy to recall under exam pressure.

Topics

#Network Intelligence Center#Performance Dashboard#VPC Peering#Monitoring Metrics

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