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Exam 350-501 topic 1 question 294 discussion

Actual exam question from Cisco's 350-501
Question #: 294
Topic #: 1
[All 350-501 Questions]


Refer to the exhibit A user is performing QoS marking on internet traffic and sending it with IPv4 and IPv6 headers on the provider edge device PE1. IPv4 traffic is classified with DSCP 4 and IPv6 traffic is classified with DSCP 6. Which action must the engineer take to begin implementing a QoS configuration on PE1 for the
IPv6 traffic?

  • A. Create an access list that includes any IPv6 traffic and apply it to CM-20.
  • B. Create access list IPv6-match and configure match ip dscp 4 and match ip dscp 6 in class maps CM-10 and CM-20.
  • C. Configure match ip dscp 4 in class map CM-10 and match ip dscp 6 in class map CM-20.
  • D. Create access list IPv6-filter and remove DSCP value 4 and 6 in class maps CM-10 and CM-20.
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Suggested Answer: A 🗳️
by ccie_race at Oct. 25, 2022, 3:19 a.m.

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Martiian
10 months, 1 week ago
Selected Answer: A
I read it as... B and C - why match dscp value in the same class map that sets them...? D - doesn't make sense to remove dscp values.
upvoted 1 times
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akm88
10 months, 2 weeks ago
A is right https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/www.cisco.com/content/en/us/td/docs/switches/metro/me3600x_3800x/software/release/15-4_3_S/configuration/guide/3800x3600xscg/swv6qos.html.xml
upvoted 1 times
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Seele
1 year, 3 months ago
It only said QOS Config for IPv6, and A only talks about v6. The rest included v4 so A is the answer.
upvoted 1 times
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thejag
1 year, 7 months ago
Wow, such a confusing question! Probably A by process of elimination In the configuration are no matches in the class for CM-10 or CM-20 but then they are only asking about IPv6 QoS so any answer relating to the IPv4 or DSCP 4 should not be correct. That leaves A, to create an IPv6 access list and apply that to CM-20.
upvoted 2 times
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ccie_race
2 years ago
ipv4 policy is already there so only need to add ipv6
upvoted 1 times
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