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2017 Nov Cisco Official New Released 642-887
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Implementing Cisco Service Provider Next-Generation Core Network Services

Question No: 1

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

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

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

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

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

Answer: A

Question No: 2

Scenario:

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On P2IOS-XR router what is targeted LDP hellos hold time on LDP session with 10.0.1.1:0 LDP ID?

  1. 90 sec

  2. 10 sec

  3. 3 sec

  4. 8.6 sec

Answer: A

Explanation: Issue on P2: show mpls ldp discovery (details). Ps: The command show mpls ldp parameter is not Implemented.

Look at the end, you will see the hello and the holdtime values for the target neighbour. Be careful he is asking for quot;targeted LDP hellos hold timequot;. No other command will work!!! At the end of the show result you will see something looks like the following:

LDP discovery sources:

Targeted Hello 10.0.2.1 -gt; 10.0.1.1 active, passive;

Hello: 30 sec

holdtime: 90 sec

Question No: 3

How many labels does an MPLS packet have, with a bottom-of-stack label set to zero?

  1. The packet has no label.

  2. The packet has one label.

  3. The packet may have one or more labels.

  4. The packet has at least two labels.

Answer: D

Question No: 4

Which statement describes the QoS behavior between P and PE routers of an MPLS provider network for an L3VPN service?

  1. The PE function honors DSCP markings set by the CE.

  2. The customer and provider must agree on DSCP classification and traffic priorities.

  3. Classification of customer traffic is handled by the P router.

  4. The PE function cannot map DSCP markings to MPLS EXP bits.

Answer: B

Question No: 5

Referring to the Cisco IOS XR show command output exhibit,

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what are three possible reasons that the GigabitEthernet0/1/0/10 LDP IGP sync status is not ready? (Choose three.)

  1. GigabitEthernet0/1/0/10 is not configured to run LDP.

  2. Graceful restart is not configured on the peer.

  3. The LDP neighbor on GigabitEthernet0/1/0/10 is not up.

  4. The OSPF neighbor on GigabitEthernet0/1/0/10 is not up.

  5. LDP is up on GigabitEthernet0/1/0/10, but no label bindings have been received from the peer.

  6. GigabitEthernet0/1/0/10 is a member link of Bundle-Ether9000.

Answer: C,D,E

Question No: 6

DS-TE implementations on Cisco routers support which bandwidth pool(s) and class type(s)? (Choose two.)

  1. global pool only

  2. subpool only

  3. global pool and subpool

  4. class-type 0 only

  5. class-type 1 only

  6. class-type 0 and class-type 1

Answer: C,F Explanation:

Differential Service Tunnels

Differential Service Traffic Engineering (TE) is an extension of the regular MPLS Traffic Engineering (MPLSTE) feature. Regular TE does not provide bandwidth guarantees to different traffic classes. A single bandwidth pool (global pool) is used in regular TE that is shared by all traffic. In order to support various class of service (CoS), the ability to provide multiple bandwidth pools is required. These bandwidth pools then can be treated differently based on the requirement for the traffic class using that pool.

In RSVP global and subpools reservable bandwidths are configured on a per interface basis to accommodate TE tunnels on the node. Available bandwidth from all configured bandwidth pools is advertised using Interior Gateway Protocol (IGP). RSVP is used to signal the TE tunnel with appropriate bandwidth pool requirements.

Question No: 7

Which four options are methods by which labels can be assigned in the label stack to an IP prefix? (Choose four.)

  1. LDP

  2. CEF

  3. BGP

  4. RSVP

  5. static

  6. IGP

  7. route recursion

  8. manual tagging

Answer: A,C,D,G

Question No: 8

Which field in the MPLS shim header is used to support different QoS markings?

  1. IP precedence

  2. DSCP

  3. EXP

  4. ToS

  5. S

  6. Label

Answer: C Explanation: MPLS EXP Marking

The three MPLS EXP (experimental) bits in the shim header of an input or output MPLS packet header may be set or changed by a user configured value

Question No: 9

You are tasked to enable LDP on many of the interfaces on the Cisco CRS-3 router, and because there are many interfaces that need to have LDP enabled, you mistakenly did not enable LDP on all the required interfaces. To prevent this issue from happening again in the future, what could you do the next time you need to enable LDP on many interfaces?

  1. use the mpls ldp auto-config command under the IGP routing process

  2. use the mpls ldp sync command under the IGP routing process

  3. use the interface all command under the MPLS LDP process

  4. use the discovery command under the MPLS LDP process

Answer: A

Question No: 10

Which option describes what happens when a labelled packet with a TTL of 1 is received by an LSR?

  1. The packet is forwarded on to the next router where its TTL expires and from where an ICMP quot;time exceededquot; message is generated and routed back to the source.

  2. The packet is dropped and an ICMP quot;time exceededquot; message is IP routed back to the sender.

  3. The packet is dropped and an ICMP quot;time exceededquot; message is label-switched from the expiring router back on a new path toward the source.

  4. The packet is dropped and an ICMP quot;time exceededquot; message is label-switched from the expiring router on the same label switched path toward the destination and then back to the originating source.

  5. The packet is forwarded on to the next router where its TTL expires and from where an ICMP quot;time exceededquot; message is generated and label switched back to the source.

Answer: D

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