Valid Cisco 642-887 Exam Guide

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Question No. 1

What is a primary difference between QoS operations on IOS and IOS XR?

Answer: B

Question No. 2

In Cisco IOS, what must be configured to ensure that an MPLS TE tunnel becomes active?

Answer: A

Question No. 3

Which two network devices are trusted endpoints in a network? (Choose two.)

Answer: A, D

Question No. 4

Which Cisco IOS XR command should be used in order to enable LDP-IGP synchronization for the ISIS IGP protocol?

Answer: A

Question No. 5

Which two options are able to perform the MPLS label distribution function? (Choose two.)

Answer: C, D

Question No. 6

When configuring class-based WRED on Cisco routers, which WRED parameter is not user configurable on a Cisco IOS XR but is user configurable on a Cisco IOS and IOS XE?

Answer: D

Comparison of Cisco IOS QoS and Cisco IOS-XR QoS

The Cisco IOS-XR software implementation of QoS is basically the same as the QoS implementation on Cisco

IOS software, with the following exceptions:

*On Cisco IOS-XR software, the bandwidth command can be configured only in egress policies.

*The following changes have been made to the class-map command on Cisco IOS-XR software:

–Supports 4K per logical router.

–Maximum number of match criteria configurable in one class map is eight.

*When a class is marked as high priority using the priority command on Cisco IOS-XR software, we recommend that you configure a policer to limit the priority traffic. Limiting the priority traffic will ensure that the priority traffic does not starve all of the other traffic on the line card. Use the police command to explicitly configure the policer.

*On Cisco IO-XR software, only one conform-action, exceed-action, or violate-action command can be configured at a time. To configure traffic policing, use the police command.

*On Cisco IOS-XR software, policy modifications cannot be made on existing policies. Use the policy-map command to remove the policy from all attached interfaces, delete the policy map, and redefine a new policy.

*When configuring a policy map on Cisco IOS-XR software, the maximum number of classes configurable in one policy map is 16, which includes both Level 1 and Level 2 classes. To configure a policy map, use the policy-map command.

*When WRED is configured on Cisco IOS-XR software, the mark probability in the random-detect command is not configurable—it is always set to 1.

*When the random-detect exp command is used on Cisco IOS-XR software, the exponential weighting constant is not configurable and will be programmed automatically by Cisco IOS-XR software.

*When access control lists (ACLs) are used in QoS class maps, the underlying deny or permit actions associated with access control entries (ACEs) are ignored. ACEs are used as a classification mechanism in order to provide appropriate QoS behavior as specified in class maps. Use ACLs that include ACEs with permit actions only.

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