[2018-April-New]Download 642-887 PDF from Braindump2go[33-43]

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QUESTION 33
Which Cisco IOS XR high-availability feature is used to prevent routes from being used before LDP converges?

A. LDP session protection
B. LDP-IGP synchronization
C. BFD
D. IGP session protection

Answer: B

QUESTION 34
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

QUESTION 35
Referring to the Cisco IOS XR show command output exhibit, What are three possible reasons that the GigabitEthernet0/1/0/10 LDP IGP sync status is not ready? (Choose three.)

A. GigabitEthernet0/1/0/10 is not configured to run LDP.
B. Graceful restart is not configured on the peer.
C. The LDP neighbor on GigabitEthernet0/1/0/10 is not up.
D. The OSPF neighbor on GigabitEthernet0/1/0/10 is not up.
E. LDP is up on GigabitEthernet0/1/0/10, but no label bindings have been received from the peer.
F. GigabitEthernet0/1/0/10 is a member link of Bundle-Ether9000.

Answer: CDE

QUESTION 36
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: CD

QUESTION 37
On Cisco routers, which three methods can be used to map traffic into the MPLS traffic engineering tunnel? (Choose three.)

A. on-demand routing
B. static routing
C. optimized edge routing
D. policy-based routing
E. autoroute

Answer: BDE

QUESTION 38
Which three statements are correct regarding a Cisco MPLS TE? (Choose three.)

A. A Cisco MPLS TE tunnel maps onto an LSP path.
B. Tunnels are bidrectional by default.
C. Packets that are mapped into a Cisco MPLS TE tunnel will have two labels, with the top label indicating
what the tail-end router should do with the packet.
D. A tunnel that is created with a priority of 0 can pre-empt an existing tunnel with a priority of 7.
E. CBR takes into account link resource and traffic tunnel attributes.
F. RSVP is used between customer routers.

Answer: ADE

QUESTION 39
On a Cisco router, when will the router actually reserve the bandwidth for the MPLS traffic engineering tunnel?

A. during the autoroute process
B. during constraint-based routing calculations
C. on the receipt of the RSVP Path message
D. on the receipt of the RSVP Resv message

Answer: D

QUESTION 40
Cisco MPLS TE path setup can be affected by which three tunnel attributes? (Choose three.)

A. bandwidth
B. delay
C. MTU
D. priority
E. affinity

Answer: ADE

QUESTION 41
When using the tunnel mpls traffic-eng path-option 1 explicit name test command in Cisco MPLS TE tunnel configurations, the test explicit-path configuration will consist of a list of which values?

A. tunnel endpoint
B. resource class affinity
C. MPLS label
D. IP address

Answer: D

QUESTION 42
Cisco MPLS TE resource attributes that are configured locally for each link are distributed to the headend router of the traffic engineering tunnel using which protocol?

A. BGP
B. MP-BGP
C. LDP
D. RSVP
E. OSPF or IS-IS with TE extension

Answer: E

QUESTION 43
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

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