Cisco Quality of Service (QoS) - 642-642 Exam Practice Test

A. so that class-based policing can mark at Layer 2 and Layer 3 at the same time

B. so that conform, exceed, and violate traffic can be marked with different CLPs

C. so that traffic can be policed using two separate rates

D. so that exceed traffic can be shaped and violate traffic can be policed

E. so that conform traffic from different flows can be marked with different DSCPs

A. router(config-if)# ip nbar protocol-discovery

B. router(config-cmap)# match protocol {protocol-name}

C. router(config)# ip nbar port-map {protocol} [tcp|udp] {port-number} {port-number} ....

D. router(config)# ip nbar pdlm {pdlm-file}

A. expedited forwarding

B. guaranteed bandwidth

C. class selector

D. best effort

A. to enable the IOS to copy the ToS field from the original IP header to the outer tunnel IP header

B. to enable the IOS to copy the ToS field from the outer tunnel IP header back into the original IP header

C. to enable class-based marking on tunnel interface

D. to enable the IOS to classify the packet based on the original IP header instead of the tunnel IP header

E. to enable class-based marking on IPSec crypto maps

F. to enable the IOS to classify the packet based on the outer tunnel IP header instead of the original IP header

A. Traffic policing should be implemented to rate-limit the ingress traffic into the P router.

B. 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.

C. 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.

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.

A. The IP phone will allow the data packet through without modifying theCoS settings of the data frame.

B. The switch will instruct the phone to allow the packet through without modification only if the phone has been configured to do so.

C. The IP phone will, by default, overwrite the switch CoS value and mark the data packet asCoS0.

D. 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.

A. Traffic from AS20 must be automatically marked via an inbound QoS map on POP B, resulting in the community attribute set to10:50.

B. Traffic from AS20 must have the community attribute set to10:50 in a route-map, and send-community must be specified.

C. Traffic from AS20 must have the extended community attribute set to10:50 in a route-map, and send-community extended (or send-community both) must be specified.

D. No actions are needed. Traffic must be marked in AS20 by the customer as10:50 before it arrives at the service provider.