Exam 300-420 topic 1 question 138 discussion

Actual exam question from Cisco's 300-420

Question #: 138
Topic #: 1

An engineer must design a QoS solution for a customer that is connected to an ISP over a 1Gbps link with a 100Mbps CIR. The ISP aggressively drops all traffic received over the CIR, which is causing numerous TCP retransmissions. The customer is not using any RTP applications but wants to maximize bandwidth usage up to the CIR. Which QoS solution should the engineer choose?

A. policing
B. queuing
C. traffic shaping
D. policer with markdown

Show Suggested Answer

Suggested Answer: C 🗳️

by cwoolie at March 28, 2022, 4:07 p.m.

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26d13e9

6 months, 2 weeks ago

No RTP applications.....then surely shaping

upvoted 1 times

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namibdigger

2 years, 3 months ago

Selected Answer: C

Shaping prevents the provider from dropping traffic that exceeds the contracted rate (Official Cert guide P.313)

upvoted 4 times

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certstudent2016

2 years, 6 months ago

however the issue is retransmission which can be avoided by Shaping - 'C' is correct https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645-policevsshape.html

upvoted 4 times

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cwoolie

2 years, 7 months ago

Answer is A. Policing is for inbound traffic like questions states.

upvoted 1 times

iLikeHamburgers

1 year, 10 months ago

Policing is used for inbound traffic. The question states "The ISP aggressively drops all traffic RECEIVED.." so the traffic being dropped is traffic sent from the customer to the ISP. The ISP is using policing to drop traffic, but if wanted to control the amount of traffic being sent OUT of your network, you would use traffic shaping.

upvoted 2 times

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