QoS Concepts

What happens when network congestion occurs without QoS mechanisms in place?

• High-priority packets are always transmitted first

• Packets are processed in the order they are received

• Voice and video packets are prioritized by default

• Packets are dropped based on size

Which of the following is NOT a source of delay in a network?

• Packetization delay

• Propagation delay

• Serialization delay

• Bandwidth delay

A network administrator is experiencing high jitter on a video conference call. What is the likely cause of this issue?

• Low bandwidth allocation

• Congestion on the network

• Increased packet size

• High packetization delay

Which type of traffic is most sensitive to delays and drops?

• Voice traffic

• Data traffic

• Email traffic

• FTP traffic

How much bandwidth does video traffic typically require for optimal performance?

• 30 Kbps

• 128 Kbps

• 384 Kbps

• 1 Mbps

If video traffic is experiencing a latency of 500 ms, what is the expected outcome?

• The video will buffer but eventually play correctly

• Video quality will degrade, resulting in choppy playback

• No impact as video can tolerate high latency

• The video will transmit faster to catch up

A company is implementing QoS to prioritize voice traffic. Which latency value should they aim to stay below?

• 100 ms

• 150 ms

• 250 ms

• 400 ms

What queuing algorithm does NOT provide priority to any type of traffic and processes packets as they arrive?

• WFQ

• FIFO

• CBWFQ

• LLQ

A network is experiencing congestion, and a router is using LLQ. What happens to voice packets in this scenario?

• They are delayed like other packets

• They are dropped to manage congestion

• They are prioritized over other traffic

• They are buffered for transmission

In WFQ, how is traffic classified for bandwidth allocation?

• By source and destination IP address

• By packet size only

• By application type

• By hop count