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Q1. Which two statements are correct in describing ISP environments that are running IP/MPLS in the core network? (Choose two.)

A. On the PE routers, each BGP route must use a unique label to reach the BGP next hop.

B. The BGP next hops point to the PE routers, and only the PE routers are required to run BGP.

C. A full mesh of IBGP sessions are required between all of the PE and P routers to ensure proper packets forwarding.

D. The PE and P routers run LDP to learn the labels for reaching the BGP next-hop addresses.

Answer: BD

Q2. 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: ACE

Q3. 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

Q4. In which two Cisco IOS XR configuration modes can mpls ldp igp sync be configured? (Choose two.)

A. config-ldp

B. config-if

C. config-ospf-ar

D. config-ospf

E. config-isis

Answer: C,D

Q5. Which QoS mechanism is used for congestion avoidance?

A. LLQ

B. CBWFQ

C. WRED

D. LFI

E. traffic policing

Answer: C

Q6. When configuring LLQ (strict priority queue) on a traffic class using the Cisco IOS XR priority command on a Cisco ASR9K router, which additional QoS command is required for this traffic class?

A. shape

B. police

C. random-detect

D. bandwidth

Answer: B

Q7. Which Cisco IOS XR command should be used in order to enable LDP-IGP synchronization for the ISIS IGP protocol?

A. RP/0/RSP0/CPU0:R1(config-isis-if-af)#mpls ldp sync

B. RP/0/RSP0/CPU0:R1(config-isis)#mpls ldp sync

C. RP/0/RSP0/CPU0:R1(config-ldp)#isis ldp sync

D. LDP-IGP synchronization is not supported for the ISIS IGP protocol on Cisco IOS XR platforms

Answer: A

Q8. When implementing Cisco MPLS TE, the constrained-based path calculations will use which value as the TE cost of each link within the MPLS domain?

A. By default, it will use the IGP metric, or each link can be assigned a specific value using the admin-weight command.

B. It can only use the IGP metric as the TE cost.

C. It will use the interface bandwidth as the TE cost.

D. Each link must be assigned a TE cost using the metric command.

Answer: A