Quality of Service Practice Questions & Answers • ExamPrepare

29 questions in this view

Page 1 of 5

Question 1

A packet is to be encapsulated at the first network egress inside an MPLS tunnel, which consists of two MPLS headers. Which of the MPLS EXP fields will be marked?

The EXP field in the bottom MPLS header.
The EXP field in both the top and bottom MPLS headers.
For Layer 2 services, the top MPLS header; for Layer 3 services, the bottom MPLS header.
The EXP field in the top MPLS header.

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Question 2

After an egress port scheduler policy has been created and applied to the port where it is to be used, which configuration step is required for the queues that are parented to an H-QoS scheduler to remain within their respective H-QoS group and, at the same time, be port-parented?

The max-rate in the egress port scheduler policy must be set to the total rate available in the port.
Each queue within every H-QoS group must be explicitly port-parented.
Each Tier-1, Tier-2 and Tier-3 scheduler in each of the relevant H-QoS scheduler policies must be explicitly port-parented.
The Tier-1 scheduler in each of the relevant H-QoS scheduler policies must be explicitly port-parented.

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Question 3

When using an egress port scheduler, which scheduling loop priority are orphaned queues allocated BW on?

1st
8th
9th
17th

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Question 4

Which of the following factors is NOT taken into consideration when deciding how to allocate bandwidth in a hierarchical scheduler environment?

The forwarding class of the packets mapped to each queue and policer.
The administrative CIR and PIR values of each queue, policer and scheduler.
Within-CIR and above-CIR priority levels of each queue, policer and scheduler.
Within-CIR and above-CIR weight values of each queue, policer and scheduler.

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Question 5

Consider the exhibit. Given the scheduler-policy parameters shown, and assuming the offered rate of each queue is 10 Mbps, what are the operational PIR and CIR for queue 3?

PIR = 4 Mbps, CIR = 1 Mbps
PIR = 1 Mbps, CIR = 1 Mbps
PIR = 10 Mbps, CIR = 1 Mbps
PIR = 5 Mbps, CIR = 1.25 Mbps

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Question 6

Consider the exhibit. What happens when Child 3's offered traffic increases to 3 Mbps and starts to consume its entire operational PIR?

The arbiter sees the increase in traffic and immediately reduces the operational PIR of children 1 and 2.
The arbiter, sensing the increase in traffic from Child 3, increases the drain rate of its own token bucket to accommodate the additional traffic.
The traffic forwarded by children 1 and 2 in excess of their FIR is marked as unfair, while Child 3's traffic is marked as fair. The arbiter will give preference to the traffic marked fair.
The additional traffic offered to Child 3 will be buffered until the arbiter can re-calculate the operational PIRs of all the children.

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