Online Access Free 642-642 Exam Questions

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

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

DRAG DROP

Correct Answer:

Traffic classification using NBAR is configured using which IOS command?

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

Based on the following policy-map configuration, the bulk traffic class packets are not being ECN
marked, yet there are many random drops in the bulk traffic class. What is the most likely cause of
the problem?
router(config)# policy-map MyPolicy
router(config-pmap)# class bulk
router(config-pmap)# bandwidth 128
router(config-pmap-c)# random-detect dscp-based
router(config-pmap-c)# random-detect dscp af31 32 40 10
router(config-pmap-c)# random-detect dscp af32 28 40 10
router(config-pmap-c)# random-detect dscp af33 24 40 10
router(config-pmap-c)# random-detect ecn

• A.The CB-WRED mark probability denominator is set too low.
• B.The CB-WRED min threshold is set too low.
• C.Some of the routers within the traffic path are not ECN capable.
• D.The endpoints generating the bulk traffic packets are not ECN capable.
• E.The CB-WRED max threshold is set too high.

Which QoS mechanism adds IP Precedence information for prefixes into the FIB table?

• A.QPPB
• B.Class-Based WRED
• C.Class-Based Marking
• D.QoS pre-classify
• E.LLQ
• F.AutoQoS