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Cisco Quality of Service (QoS) Sample Questions:

1. According to the best practices, which statement is true as related to the QoS policy that should be implemented on the outbound provider (P) to provider (P) router link in a service provider network that is supporting both VoIP and data?

A) LLQ and CB-WRED should be implemented on the P router egress to support both VoIP and data traffic.
B) CBWFQ and CB-RTP header compression should be implemented on the P router egress to ensure minimum latency for VoIP traffic.
C) In the DiffServ model, ingress and egress QoS mechanisms are only required on the provider edge (PE) routers, so no QoS policy is needed on the P to P link.
D) CBWFQ and CB-WRED should be implemented on the P router egress to provide a maximum bandwidth guarantee for the VoIP traffic.

2. When configuring WFQ, what is the default number of dynamic queues based on?

A) hold-queue limit
B) drop probability denominator
C) hash of the packet headers
D) congestive discard threshold (CDT)
E) interface bandwidth
F) inter-packet arrival rate

3. Which two different traffic types have the most similar sensitivity to latency, jitter, and packet loss? (Choose two.)

A) voice signaling
B) SQL transactions
C) voice
D) streaming video
E) video conferencing
F) peer-to-peer file sharing

4. A Cisco Catalyst switch has an IP phone connected to its Fastethernet0/2 port. The IP phone has an attached PC. The Fastethernet0/2 port on the switch has been configured with the commands mls qos trust cos, mls qos trust device cisco-phone, and switchport priority extend trust.
What will happen to a data frame with a CoS of 5 that is sent from the PC through the IP phone to port Fastethernet0/2 on the switch?

A) The switch will instruct the phone to allow the packet through without modification only if the phone has been configured to do so.
B) The IP phone will allow the data packet through without modifying theCoS settings of the data frame.
C) While the packet will pass through the IP phone without modification, the switch will, by default, override theCoS priority with the switch default CoS priority.
D) The IP phone will, by default, overwrite the switch CoS value and mark the data packet asCoS0.

5. What are two benefits of WFQ? (Choose two.)

A) WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size.
B) Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full.
C) WFQ can provide fixed-delay guarantees.
D) WFQ can provide fixed-bandwidth guarantees.
E) WFQ is very easy to configure, and no manual traffic classification is necessary.
F) WFQ can provide fixed-bandwidth and fixed-delay guarantees.

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