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Exam 350-801 topic 1 question 281 discussion

Actual exam question from Cisco's 350-801
Question #: 281
Topic #: 1
[All 350-801 Questions]

What is a description of the DiffServ model used for implementing QoS?

  • A. AF43 has higher drop precedence than AF42 but lower drop precedence than AF41
  • B. RTP traffic from voice and video calls is marked EF and placed in the same queue
  • C. AF41 has higher drop precedence than AF42, which has higher drop precedence than AF43
  • D. Voice and video calls are marked with different DSCP values and placed in different queues
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Suggested Answer: D 🗳️
by Icke1973 at Sept. 6, 2022, 6:28 p.m.

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Icke1973
Highly Voted 1 year, 8 months ago
I would say "D" is correct. A make no sense, because 43 has a higher drop precedence then 42 which has a higher drop precedence then 41.
upvoted 9 times
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G0y0
Most Recent 2 months, 1 week ago
Selected Answer: D
A and C. are incorrect. AF43 has higher drop precedence than AF42 and AF41. B. is incorrect. Voice call is EF and Video is AF41 (or AF42 for jabbers). Preferred Architecture for Cisco Collaboration 12.x Enterprise On-Premises Deployments. Chapter 8: Bandwidth Management
upvoted 1 times
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Riktov
6 months, 2 weeks ago
should be D, the other answers do not make any sense
upvoted 2 times
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Tuanski33
1 year, 2 months ago
Selected Answer: D
D makes most sense
upvoted 3 times
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auswar3ft
1 year, 3 months ago
Selected Answer: D
D makes most sense, A & C are plain wrong
upvoted 2 times
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wwisp3422112
1 year, 5 months ago
D is the only one that makes sense.
upvoted 3 times
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ASSH
1 year, 6 months ago
The EF model is used for voice over IP media traffic (RTP) by default in most vendors phones. Cisco IP Phones mark signaling packets (SCCP or SIP) to CS3 (24), while media (RTP) is marked to EF (DSCP 46) by default. All EF traffic is normally mapped to the priority queue (PQ) on Cisco switches and routers.
upvoted 1 times
ASSH
1 year, 6 months ago
https://www.networkworld.com/article/2234016/the-qos-expedited-forwarding-ef-model.html
upvoted 1 times
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OSJAY
1 year, 7 months ago
Agree. For same reason C makes no sense either. D is my answer
upvoted 2 times
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Community vote distribution
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C (25%)
B (20%)
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