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Cisco Quality of Service (QoS) Sample Questions:

1. What describes the use of best-effort service with overprovisioning?

A) ensuring quality of service by providing more than the aggregate bandwidth required
B) ensuring availability and quality of service by always provisioning key services across at least two service provider networks
C) ensuring quality of service by being able to load balance across links in times of congestion
D) ensuring constant availability by provisioning multiple paths through the network
E) ensuring quality of service by deploying sophisticated prioritization and congestion management mechanisms

2. 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) 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.
C) CBWFQ and CB-RTP header compression should be implemented on the P router egress to ensure minimum latency for VoIP traffic.
D) CBWFQ and CB-WRED should be implemented on the P router egress to provide a maximum bandwidth guarantee for the VoIP traffic.

3. Refer to the exhibit. A typical configuration involving an IP phone with an attached PC is shown. According to QoS recommendations, at which demarcation line (shown as dotted lines) would the trust boundary normally exist?

A) A
B) D
C) C
D) B

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

5. The show policy-map interface command output is showing too many random drops for the mission-critical traffic class. What can be changed to reduce the random drops?

A) Increase the WRED min-threshold value for the mission-critical traffic class.
B) Decrease the WRED drop probability denominator for the mission-critical traffic class.
C) Increase the WRED max-threshold value for the mission-critical traffic class.
D) Decrease the queue-limit for the mission-critical traffic class.
E) Enable fair-queue within the mission-critical traffic class.

Solutions: