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Exam 300-420 topic 1 question 140 discussion

Actual exam question from Cisco's 300-420
Question #: 140
Topic #: 1
[All 300-420 Questions]

An engineer must design an in-band management solution for a customer with branch sites. The solution must allow remote management of the branch sites using management protocols over an MPLS WAN. Queueing is implemented at the remote sites using these classes:
✑ Class1 equals voice traffic
✑ Class2 equals mission-critical traffic
✑ Class3 equals default traffic
How must the solution prioritize the management traffic over the WAN?

  • A. Mark the traffic with DSCP EF and map into Class1 with a minimum bandwidth assigned by reducing the bandwidth available to Class2.
  • B. Mark the traffic with DSCP CS1 and map into Class2 with a minimum bandwidth assigned by reducing the bandwidth available to Class3.
  • C. Mark the traffic with DSCP CS6 and map into Class1 with a minimum bandwidth assigned by reducing the bandwidth available to Class2.
  • D. Mark the traffic with DSCP CS2 and map into Class2 with a minimum bandwidth assigned by reducing the bandwidth available to Class3.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by morlu at Jan. 3, 2022, 11:41 p.m.

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iLikeHamburgers
10 months, 1 week ago
Selected Answer: D
in the OCG, pg 311, CS2 is labeled as Network Management. Since non of the other answers suggest marking the management traffic as CS2, and you wouldn't want to reduce the bandwidth to any other Classes except for Class 3, D is the obvious choice.
upvoted 2 times
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namibdigger
1 year, 2 months ago
Selected Answer: D
NW-Mgmt is the traffic in question i guess which equals CF2 (recommendation) and is to be placed in class 2 which and reduces less important class3 bandwith.
upvoted 2 times
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cwoolie
1 year, 6 months ago
Why not "B"? Although network management traffic may not be considered as critical as voice and video traffic, it does merit some prioritization. In Cisco QOS classification and marking recommendations, network management traffic is given a Layer 3 classification of CS1 PHB (DSCP16) or Layer 2 CoS of 2. That is from the Cisco design book...
upvoted 1 times
cwoolie
1 year, 6 months ago
Disregard. CiscoPress says management traffic is classified as CS2. So I agree Answer is D
upvoted 2 times
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morlu
1 year, 9 months ago
Selected Answer: D
It's D. CS2 is for OAM ('management'). Also, you wouldn't want to reduce the bandwidth for Class2 since it is specifically labeled mission-critical.
upvoted 4 times
cryptonite
1 year, 8 months ago
You don put management traffic in the same class as voice!!
upvoted 1 times
cryptonite
1 year, 8 months ago
I agree the answer is D
upvoted 1 times
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