Cisco 642-642

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Cisco Quality of Service (QoS) Sample Questions:

1. To determine the bandwidth requirement for each VoIP call, not including Layer 2 overhead, how much bandwidth per call should be added to account for the voice signaling traffic?

A) 480 bps
B) 240 bps
C) 150 bps
D) 20 bps
E) 40 bps
F) 640 bps

2. What is the purpose of using multiactions traffic policing?

A) so that exceed traffic can be shaped and violate traffic can be policed
B) so that conform, exceed, and violate traffic can be marked with different CLPs
C) so that conform traffic from different flows can be marked with different DSCPs
D) so that class-based policing can mark at Layer 2 and Layer 3 at the same time
E) so that traffic can be policed using two separate rates

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

4. According to the best practices, in a service provider network, which statement is true as related to the QoS policy that should be implemented on the inbound provider (P) to provider (P) router link?

A) Class-based marking should be implemented because it will be needed for the class-based queuing that will be used on the P router output.
B) In the DiffServ model, all ingress and egress QoS processing are done at the network edge (for example, PE router), so no input or output QoS policy will be needed on the P to P link.
C) Traffic policing should be implemented to rate-limit the ingress traffic into the P router.
D) Because traffic should have already been policed and marked on the upstream ingress PE router, no input QoS policy is needed on the P to P link.

5. What does the following command accomplish?
router(config-pmap-c)# shape fecn-adapt

A) enables the router to respond to BECN bits by creating test frames in the opposite direction with the FECN bit set
B) enables the router to increase the shaping rate when BECN bits are received
C) enables the router to lower the shaping rate when FECN bits are received
D) enables the router to lower the shaping rate when BECN bits are received
E) enables the router to increase the shaping rate when FECN bits are received
F) enables the router to respond to FECN bits by creating test frames in the opposite direction with the BECN bit set

Solutions: