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Exam Professional Cloud Network Engineer topic 1 question 171 discussion

Actual exam question from Google's Professional Cloud Network Engineer
Question #: 171
Topic #: 1
[All Professional Cloud Network Engineer Questions]

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?

  • A. Ensure that each zone in each of the VPC networks has at least 10 compute instances. Look in Project A for the reported metric.
  • B. Ensure that each zone in each of the VPC networks has at least 9 compute instances. Look in Project B for the reported metric.
  • C. Ensure that each zone in each of the VPC networks has at least 9 compute instances. Look in Project A for the reported metric.
  • D. Ensure that each zone in each of the VPC networks has at least 10 compute instances. Look in Project B for the reported metric.
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Suggested Answer: D 🗳️

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Positron75
Highly Voted 1 year, 3 months ago
Selected Answer: D
D, as explained in https://cloud.google.com/network-intelligence-center/docs/performance-dashboard/concepts/metrics-views?hl=en#metric_availability_and_confidence_levels and https://cloud.google.com/network-intelligence-center/docs/performance-dashboard/concepts/metrics-views?hl=en#packet-loss "90% confidence 2.5 VMs multiplied by the number of zones in the project." Which in our case is 2.5 x 4 = 10. "If the peered networks are in different projects, packet loss is visible in the destination project." Which in this case is project B.
upvoted 5 times
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glb2
Most Recent 2 weeks, 2 days ago
Selected Answer: C
C is the answer. Why the Other Options Are Incorrect: A & D: Say “10 compute instances” — this is not required; 9 is sufficient for 90% confidence. B & D: Suggest looking in Project B, but the traffic starts in Project A, so metrics should be viewed there.
upvoted 1 times
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anshad666
1 year ago
Selected Answer: D
D only
upvoted 1 times
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irmingard_examtopics
1 year, 3 months ago
Selected Answer: D
For a 90% confidence, the required number of VMs in each zone is 2.5 VMs x the number of zones in the project, so 10 VMs per zone. Packet loss is visible in the destination project.
upvoted 4 times
irmingard_examtopics
1 year, 3 months ago
https://cloud.google.com/network-intelligence-center/docs/performance-dashboard/concepts/overview
upvoted 2 times
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toasterbath777
1 year, 3 months ago
Selected Answer: A
https://cloud.google.com/vpc/docs/monitoring-packet-mirroring
upvoted 1 times
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toasterbath777
1 year, 3 months ago
If it's 2.5 x 4 zones wouldn't that be 10? 2.25 x 4 zones equals 9 which is not what the link states. Are you factoring in the 90% to get to 9?
upvoted 1 times
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desertlotus1211
1 year, 3 months ago
90% confidence 2.5 VMs x the number of zones in the project. For example, if you have 12 zones in your project, you must have 30 VMs in each zone.
upvoted 1 times
desertlotus1211
1 year, 3 months ago
2.5 x 4 zones = 9 VMs
upvoted 1 times
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desertlotus1211
1 year, 3 months ago
Anything with VPC A as the destination is wrong: On the other hand, suppose that these two networks are not in the same project. That is, suppose network A is part of project A, and network M is part of project M. When the networks are peered, project M's Performance Dashboard shows packet loss data for situations where zone M is the destination zone. Conversely, when zone A is the destination zone, the packet loss data is visible only to project A
upvoted 1 times
desertlotus1211
1 year, 3 months ago
the destination a VPC B, so its either B or D
upvoted 1 times
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