QoS (Quality of Service) Quiz for Cisco ENCOR/CCNP

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1. Which of these best describes FIFO in QoS?

It automatically divides the interface BW by the number of flows to allocate bandwidth fairly among all flows

Queues are serviced in sequence one after the other, and each queue processes one packet only

A set of four queues (high, medium, normal, and low) are served in strict-priority order

It involves a single queue where the first packet to be placed on the output interface queue is the first packet to leave the interface

2. Which one is correct description of Policing in QoS?

Drop or re-mark incoming or outgoing traffic that goes beyond a desired traffic rate

Buffer and delay egress traffic rates that momentarily peak

Combination of queuing and scheduling

Temporary storage of excess packets

3. When Queuing in QoS is considered as ‘De-activated’ ?

When there is round robin in action

When congestion is 100%

When congestion clears

When an output interface is experiencing congestion

4. Which one is correct description of Shaping in QoS?

Storage + Scheduling

Buffer and delay egress traffic rates that momentarily peak

Drop or re-mark incoming or outgoing traffic that goes beyond a desired traffic rate

Temporary storage of excess packets

5. When Queuing in QoS is considered as ‘Activated’ ?

When congestion clears

When an output interface is experiencing congestion

When there is round robin in action

When there is no congestion at all

6. Which of these best describes PQ in QoS?

It automatically divides the interface BW by the number of flows to allocate bandwidth fairly among all flows

Queues are serviced in sequence one after the other, and each queue processes one packet only

It involves a single queue where the first packet to be placed on the output interface queue is the first packet to leave the interface

A set of four queues (high, medium, normal, and low) are served in strict-priority order

7. Which one is correct description of Queuing (Buffering) in QoS?

Drop or re-mark incoming or outgoing traffic that goes beyond a desired traffic rate

Temporary storage of excess packets

Buffer and delay egress traffic rates that momentarily peak

Storage + Scheduling

8. Which of these best describes WFQ in QoS?

Queues are serviced in sequence one after the other, and each queue processes one packet only

It involves a single queue where the first packet to be placed on the output interface queue is the first packet to leave the interface

A set of four queues (high, medium, normal, and low) are served in strict-priority order

It automatically divides the interface BW by the number of flows to allocate bandwidth fairly among all flows

9. In Token Bucket, the tokens are added into the bucket at a fixed rate which is called:

CIR

PIR

10. Which one is correct description of Congestion Management in QoS?

Temporary storage of excess packets

Buffer and delay egress traffic rates that momentarily peak

Drop or re-mark incoming or outgoing traffic that goes beyond a desired traffic rate

Queuing + Scheduling

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