QoS (Quality of Service) Quiz (Online)

Which option describes the purpose of traffic policing?

It drops traffic that exceeds the CIR

It prioritizes routing protocol traffic

It queues and then transmits traffic that exceeds the CIR

It remarks traffic that is below the CIR

What happens if conflicting QoS policies are deployed to the same Router?

If multiple policies apply, the more specific QoS policy takes precedence

If multiple policies apply, no QoS policy will take precedence

None

If multiple policies apply, the first applied QoS policy takes precedence

Which 8-bit field exists in IP packet for QoS?

DSCP

IP Precedence

ToS

Cos E

Which one is not a QoS requirement for voice?

Bandwidth 80kbps per call minimum for all codecs

Loss less than 1 percent

Jitter less than 30 ms

Latency less that 150 ms

How does DiffServ deliver QoS across the network?

DiffServ tries to deliver a particular level of service on a per-flow basis across the network

When using DiffServ, the network tries to deliver a particular kind of service that is based on the QoS that is specified by each packet

DiffServ classifies and marks traffic at each node in the network

DiffServ delivers a particular kind of service based on either a flow-based behavior or a per-hop behavior, depending on how the traffic was marked and classified at ingress

Do QoS policies apply to the sender & receiver of traffic?

No, QoS policies must be applied only on the sender

No, QoS policies must be applied only on the receiver

None

Yes, QoS policies need to be applied to both

What is a mechanism to control amount and rate of traffic sent to network?

Traffic Flow

Traffic Control

Traffic Shaping

Traffic Congestion

Which QoS model is the most widely used one today?

DiffServ

IntServ

None of these

Best-Effort

Which mathematical model is used by traffic policing mechanisms to meter traffic?

Token Bucket

FIFO metering

Predictor or stacker

RED

In which service do we try to avoid traffic congestion?

Quality of service

Both congestion control and quality of service

Congestion control

Neither congestion control nor quality of service

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