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
Question
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)- A2% (1)
- B89% (42)
- C2% (1)
- D6% (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.
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