Exam 300-420 topic 1 question 144 discussion

Actual exam question from Cisco's 300-420

Question #: 144
Topic #: 1

An engineer must design a QoS solution for a customer. The network currently supports data only, but the customer will roll out VoIP and IP video in conjunction with the new QoS solution. The engineer plans to use DiffServ. To ensure priority for voice services, which model must the design include?

A. 8-class model
B. 4-class model
C. 6-class model
D. 12-class model

Show Suggested Answer

Suggested Answer: A 🗳️

by Reinier_veen at Oct. 11, 2022, 2:04 p.m.

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Lungful

9 months ago

Selected Answer: A

A is correct. 8-class also uses multimedia categories and the question mentioned IP video.

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cerifyme85

1 year, 1 month ago

why not 12?

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bccabrera

1 year ago

The 12-class QoS strategy model builds upon the 8-class model and includes the following additional classes: Real-time Interactive Broadcast Video Management/OAM Bulk Data https://www.ciscopress.com/articles/article.asp?p=2756478&seqNum=8

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Reinier_veen

1 year, 6 months ago

got it. Ignore my previous comment. 4-class has one queue for both voice and data. 8-class has different queues for voice and data. question states that voice has to get priority over all other (including voice) data. So we need 8-class (at least).

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Hope66

1 year, 7 months ago

I'm prone for 8-class model https://www.ciscopress.com/articles/article.asp?p=2756478&seqNum=8

upvoted 2 times

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Reinier_veen

1 year, 7 months ago

why not 4-class model? In 4-class is a seperate class for voice (EF). Is nog that the question?

upvoted 1 times

mgiuseppe86

7 months, 3 weeks ago

It is also asking for IP Video.. you get that in 8-class 8-class: 4-class + Multimedia Streaming | Multimedia conferencing | Network control | scavenger

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