642-887 Sample Question: 20

Question: 20

When troubleshooting LDP operations on the Cisco IOS and IOS XE routers, what is one of the first things that should be verified?

A. if running OSPF as the IGP, ensure that OSPFv3 has been enabled
B. check if the ip cef command has been enabled
C. verify in the running configurations that all of the required LDP interfaces are defined under the mpls ldp command configuration mode
D. verify if there are any access lists that are denying TCP and UDP port 464 packets

Answer: B

642-887 Sample Question: 19

Question: 19

What is the term that is used for the label that an LSR assigns and distributes to other LSRs in MPLS?

A. Local
B. Remote
C. Explicit
D. Explicit Null
E. Aggregate

Answer: A

642-887 Sample Question: 18

Question: 18

Within the service provider core network, which two QoS mechanisms are typically deployed on the P routers? (Choose two.)

A. LLQ
B. traffic policing and remarking
C. WRED
D. traffic shaping
E. traffic classification and markings
F. link fragmentation and interleaving

Answer: A,C

642-887 Sample Question: 17

Question: 17

On the Cisco IOS XR, which MQC configuration is different than on the Cisco IOS and IOS XE?

A. On the Cisco IOS XR, WRED can only be applied in the output direction.
B. On the Cisco IOS XR, marking can only be applied in the input direction.
C. On the Cisco IOS XR, LLQ can be applied in the input or output direction.
D. On the Cisco IOS XR, LLQ can use up to four priority queues: level 1, level 2, level 3, and level 4.

Answer : C

642-887 Sample Question: 16

Question: 16

On a Cisco IOS XR router, which mechanism protects the router resources by filtering and policing the packets flows that are destined to the router that is based on defined flow-type rates?

A. LLQ
B. LPTS
C. Committed Access Rate
D. Control Plane Policing
E. Management Plane Protection
F. NetFlow
G. ACL

Answer : B

642-887 Sample Question: 15

Question: 15

Which of the following three statements are correct regarding IPv6 QoS? (Choose three.)

A. The traffic class field in the IPv6 header can be used to set specific precedence or DSCP values.
B. A 20-bit flow label field enables per-flow processing.
C. DS-TE is not supported by IPv6.
D. Per-hop behavior in IPv6 networks is based on EXP bits.
E. IPv6 QoS features are configured using the modular QoS CLI on Cisco routers.

Answer: A,B,E

642-887 Sample Question: 14

Question: 14

Which three steps are required to configure QPPB on Cisco IOS XR routers? (Choose three.)

A. Apply a QPPB route policy to the BGP process using the table-policy command.
B. Apply a QPPB route policy to the BGP neighbor using the route-policy command.
C. Define a QPPB route policy to match the customer routes, then set the IP precedence or qos- group.
D. Define a QPPB route policy to match the customer IP precedence or qos-group markings, then set
the BGP community.
E. Enable QPPB on an interface using the ipv4 bgp policy propagation input ip-precedence|qos- group destination|source command.
F. Enable QPPB on an interface using the ipv4 bgp policy propagation output ip-precedence|qos- group destination|source command.

Answer: A,C,E