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Exam HPE6-A45 topic 1 question 3 discussion

Actual exam question from HP's HPE6-A45
Question #: 3
Topic #: 1
[All HPE6-A45 Questions]

Refer to the exhibit.

A network administrator sets up prioritization for an application that runs between Device 1 and Device 2. However, the QoS for the application is not what the administrator expects.
How can the administrator check if the network infrastructure prioritizes traffic from Device 1 and Device 2?

  • A. Run a packet capture on Device 2, run the application, and look in the packet capture for a high value DSCP in the IP header.
  • B. Set up RMON alarms on the switches that trigger when a high number of packets are dropped. Then, run the application and check for the alarm.
  • C. Clear interface statistics on the switches. Then, run the application and check the interface queue statistics for the switch-to-switch links.
  • D. Run a packet capture on Device 1, run the application, and look in the packet capture for a high value DSCP in the IP header.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by CptVegetable at June 3, 2020, 4:18 p.m.

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CptVegetable
Highly Voted 3 years, 10 months ago
Answer is C. From the course manual... Checking the actual egress queues that the switch is using gives you the best information. You can check this queue on each switch in the path by clearing statistics, running the applications, and then entering the show interface queue <interface port list> command.
upvoted 5 times
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TechLernin
Most Recent 3 years, 6 months ago
Correct answer is C. The question isn't asking to validate the packet marking. It's asking to validate the prioritisation on the devices in-path.
upvoted 2 times
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udo2020
3 years, 7 months ago
I don't think you'll see the marking on the interface statistic. Furthermore it's better to check on device 2 if the marking is received.
upvoted 1 times
Hugh_Jazz
3 years, 7 months ago
Correct. Answer is A. C will only work if the Hardware TX/RX rings are full and the Software queues kick in, and that only gives you the queue usage, not markings.
upvoted 1 times
udo2020
3 years, 6 months ago
While reading the question again I think C is the answer. Because validating the packet or if the packet in the prio queue can be done on the interface queue statistics. With a check on device 2 we can see if the marking is ok but not if it's in the right queue.
upvoted 1 times
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A (35%)
C (25%)
B (20%)
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