Implementing Cisco Service Provider Next-Generation Core Network Services (642-887) Free Practice Test

Question 1

Referring to the Cisco IOS XR configuration exhibit,

which labels will be advertised by the router with this configuration?

A. No labels will be advertised to any LDP peers.

B. Labels for all prefixes will be advertised to all the LDP peers.

C. Labels for all prefixes will be advertised to the 10.1.1.1 LDP peer.

D. Only the label for 10.1.1.1/32 will be advertised to all the LDP peers.

Correct Answer: D

Question 2

What is the function of MPLS FRR?

A. automatically redirects MPLS TE traffic away from degraded links

B. routes traffic onto a backup MPLS TE tunnel during link failures

C. automatically updates BGP prefixes during link failures

D. automatically repairs LDP adjacency issues for MPLS TE tunnel endpoints

Correct Answer: B

Question 3

Which two factors must you consider when configuring MPLS EXP? (Choose two.)

A. MPLS EXP classification for bridged MPLS packets on EVCs is supported

B. A packet that IP ToS classifies at ingress can be reclassified by MPLS EXP at egress

C. MPLS EXP marking is supported in the ingress direction

D. MPLS EXP marking is supported in the egress direction

E. A packet that MPLS classifies at ingress can be reclassified by IP ToS at egress

Correct Answer: C,E

Question 4

How is bandwidth recalculated when utilizing the automatic bandwidth adjustment feature for MPLS TE?

A. Ping is used to measure congestion and the bandwidth is adjusted by a configured percentage until the maximum value is reached

B. The tunnel's output is sampled and then the bandwidth is adjusted by a configured percentage until the configured maximum value is reached

C. The tunnel's output average is periodically sampled and then the bandwidth is adjusted to the largest sample obtained during the period, or to the configured maximum

D. Ping is used to measure congestion and the bandwidth is adjusted to either the minimum, average, or maximum configured bandwidth value

Correct Answer: C

Question 5

Refer to the exhibit. LSR A, LSR B, and LSR C have LDP running and see one another as neighbors. LSR A wants to send a packet that is destined for the LSR C loopback0 IP address. When LSR A first sends that packet to LSR B, which label value does the IP packet carry?

A. the label value that LSR C assigns to the LSR C loopback

B. the label value that LSR A assigns to the LSR C loopback

C. the label value that LSR C assigns to LSR A when the LSRs need to exchange traffic

D. the label value that LSR B assigns to the LSR C loopback

Correct Answer: D

Question 6

Which IOS XR Software feature supports establishing point-to-point and point-to-multipoint TE tunnels traversing multiple IGP areas and levels allowing headend and tailend routers to reside in different areas?

A. loose hop expansion

B. interarea support

C. FRR node protection

D. loose hop reoptimization

Correct Answer: B

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Question 7

Scenario:

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

A. 90 sec

B. 3 sec

C. 10 sec

D. 8.6 sec

Correct Answer: A

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Question 8

Layer 2 VPN services that are offered by traditional service providers using a SONET/SDH backbone can be implemented by service providers using an IP/MPLS backbone with which MPLS feature?

A. AToM

B. cell-mode MPLS

C. virtual private WAN services

D. LSP stitching

Correct Answer: A

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Cisco Implementing Cisco Service Provider Next-Generation Core Network Services (642-887) Free Practice Test