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Cisco Quality of Service (QoS) Sample Questions:

1. In a typical converged campus network, which two of the following are considered QoS best practices? (Choose two.)

A) Catalyst switches should use weighted round robin (WRR) queuing giving the voice traffic the highest priority.
B) NBAR is used at the high speed core layer to discover and classify network applications.
C) Traffic classification and marking is performed as close to the traffic source as possible.
D) Only a reasonable number of applications should be classified into the mission-critical traffic class.
E) Ensure voice traffic is serviced by a weighted fair queue.
F) Traffic classification and marking is performed at the high speed core layer.

2. Switch port fa0/2 has been configured to connect an IP phone with an attached PC. Given the set of commands shown below, where does the trust boundary lie?
interface fa0/2 mls qos trust cos mls qos trust device cisco-phone switchport voice vlan 112

A) between the IP phone and the PC
B) between the IP phone and the switch
C) between the PC port and the LAN port on the IP phone
D) between the access layer switch and the distribution layer switch

3. 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) CBWFQ and CB-RTP header compression should be implemented on the P router egress to ensure minimum latency for VoIP traffic.
B) LLQ and CB-WRED should be implemented on the P router egress to support both VoIP and data traffic.
C) CBWFQ and CB-WRED should be implemented on the P router egress to provide a maximum bandwidth guarantee for the VoIP traffic.
D) 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.

4. HOTSPOT

5. Refer to the exhibit. Why would applying the limit-interactive policy-map to the fa0/0 interface as shown below cause an error?
interface fa0/0 service-policy input limit-interactive

A) The interactive traffic class is missing the bandwidth {kbps} command.
B) TCP header compression can only be applied in the output direction.
C) There is already an output service-policy defined on the fa0/0 interface.
D) The interactive class-map has not been configured.
E) Class-based policing can only be applied in the output direction.

Solutions: