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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

1. HOTSPOT

2. Refer to the exhibit. QPPB is being used by the service provider (AS30). The table-map and route-map called "important" are implemented on router POP A.
The command bgp-policy destination ip-prec-map is applied to the interface between POP A in AS30 and NAP (AS40).
Which QoS action would have to be applied on POP B in AS30 to ensure that the traffic from the NAP (AS40) to the customer (AS20) will be marked with an IP precedence of flash?

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.

3. Based on the configuration, which two statements are true? (Choose two.)
Policy-map shape-cbwfq
Class interactive
Shape average 256000
Shape adaptive 128000
Bandwidth 128

A) If the interactive traffic class exceeds an average rate of 256 kbps, the traffic rate will be throttled down to 128 kbps.
B) The interactive traffic class will have a min-rate (min-cir) of 128 kbps.
C) This configuration allows class-based traffic shaping to lower the traffic rate in response to the BECN bit.
D) The interactive traffic class will have a minimum bandwidth guarantee of 256 kbps.
E) The interactive traffic class will have a maximum bandwidth guarantee of 256 kbps.

4. Refer to the exhibit. A service provider is considering several alternative provisioning schemes for a new network. One proposed scheme involves aggregating 10-Mbps links from customers into a network with multiple 100-Mbps links to ensure that the network links have at least two times the capacity of the aggregate of the customer links.
What is the most appropriate description for the proposed scheme?

A) overprovisioning
B) oversubscription
C) Bandwidth-on-Demand
D) overaggregate
E) CIR of 0

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

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

Solutions: