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Cisco Quality of Service (QoS) Sample Questions:

1. Which of the following configurations requires the use of hierarchical policy maps?

A) the use of both the bandwidth and shape statements within a CBWFQ class queue
B) the use of a strict priority-class queue within CBWFQ
C) the use of CBWFQ inside class-based shaping
D) the use of nested class-maps with class-based marking
E) the use of class-based WRED within a CBWFQ class queue

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

3. 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-bandwidth and fixed-delay guarantees.
D) WFQ is very easy to configure, and no manual traffic classification is necessary.
E) WFQ can provide fixed-delay guarantees.
F) WFQ can provide fixed-bandwidth guarantees.

4. Which element is mandatory for QoS policy propagation through BGP operations?

A) CEF
B) MPLS
C) MQC
D) QoS pre-classify
E) NBAR
F) policy-based routing

5. Traffic classification using NBAR is configured using which IOS command?

A) router(config-cmap)# match protocol {protocol-name}
B) router(config)# ip nbar pdlm {pdlm-file}
C) router(config)# ip nbar port-map {protocol} [tcp|udp] {port-number} {port-number} ....
D) router(config-if)# ip nbar protocol-discovery

Solutions: