Real Questions For Cisco 642-887 Preparaion

The CCNP Service Provider Certification is vital for network engineers, systems engineers. This certification 642-887 exam verifies skills to configure, implement, troubleshoot, and optimize service provider IP next-generation network infrastructures.

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Question No. 1

A network engineer must design a core network routing domain that supports Cisco MPLS TE. Which two interior gateway protocols represent viable solutions? (Choose two.)

Answer: B, D

Question No. 2

A customer MPLS domain recently required an excessive time to reconverge In response, a high availability solution will be deployed. Which command set should be issued to improve LDP high availability on IOS XE instances?

Answer: C

Question No. 3

Given this configuration of an interface for MPLS traffic engineering on a Cisco IOS XE router:

interface POS1/1/0

mpls traffic-eng tunnels

ip rsvp bandwidth 5000

Which option lists the equivalent configurations required on aCisco IOS XR router?

Answer: E

Question No. 4

An engineer must automatically copy the IP Prec/DiffServ PHB marking to the EXP bits of the imposed MPLS label on the ingress PE, as well as the MPLS EXP bits to the IP Prec/DiffServ of the egress PE. Which MPLS QoS model is suitable for this requirement?

Answer: C

Question No. 5

In which two Cisco IOS XR configuration modes can mpls ldp igp sync be configured? (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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