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QUESTION 21
Which statement is correct regarding the default MPLS TTL behavior?
A. When an ingress edge LSR receives an IP packet, it will decrement the IP TTL field by 1; then it will set the MPLS Label TTL field to 255.
B. When an ingress edge LSR receives an IP packet, it will decrement the IP TTL field by 1; then it will copy the decremented IP TTL field into the MPLS Label TTL field.
C. When an ingress edge LSR receives an IP packet, it will just copy the IP TTL field into the MPLS Label TTL field.
D. When an ingress edge LSR receives an IP packet, it will copy the IP TTL field into the MPLS Label TTL field first; then it will only decrement the MPLS Label TTL field by 1.
E. When an ingress edge LSR receives an IP packet, it will copy the IP TTL field into the MPLS Label TTL field first; then it will only decrement the IP TTL field by 1.

Correct Answer: B Section: (none) Explanation
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Explanation:
QUESTION 22
Which three statements are correct regarding ping mpls command operations? (Choose three.)
A. MPLS OAM has to be enabled on the router using the mpls oam command.
B. They use a 127/8 address as the destination address in the MPLS echo request packet.
C. They use ICMP echo request and ICMP echo reply packets.
D. They are used to test for a broken LSP.
E. If there is a broken LSP, instead of using label switching, the packet can still be forwarded based on the destination IP address in the mpls ping echo request packet.

Correct Answer: ABD Section: (none) Explanation
Explanation/Reference:
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QUESTION 23
What are the four fields inside the MPLS shim header? (Choose four.)
A. EXP
B. TTL
C. Version
D. S
E. Length
F. Label
G. Type
H. FCS

Correct Answer: ABDF Section: (none) Explanation
Explanation/Reference:
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QUESTION 24
Which two of the following statements are correct regarding LSPs? (Choose two.)
A. An LSP is created for every routing protocol entry.
B. Each LSP is bidirectional, that is, packets traveling in the opposite direction use the same LSP.
C. An IGP is used to populate routing tables in all routers in an MPLS domain.
D. LDP is used to propagate labels and build LSPs.
E. The FIB is used to forward MPLS-labeled packets down an LSP.

Correct Answer: CD Section: (none) Explanation
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QUESTION 25
Which four pieces of information are stored for each prefix in the LFIB? (Choose four.)
A. local label
B. outgoing label
C. next-hop IP address
D. outgoing interface
E. incoming interface
F. Layer 2 header rewrite information

Correct Answer: ABCD Section: (none) Explanation
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QUESTION 26
Which three network services can be implemented using MPLS within the service provider IP NGN core? (Choose three.)
A. Layer 2 VPNs
B. Layer 3 VPNs
C. traffic engineering
D. IntServ traffic engineering tunnels
E. encrypted LSPs

Correct Answer: ABC Section: (none) Explanation
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QUESTION 27
LDP session protection uses which one to maintain the LDP session between LDP neighbors?
A. LDP NSF
B. LDP NSR
C. backup-targeted LDP hellos
D. BFD
E. LDP-IGP synchronization

Correct Answer: C Section: (none) Explanation
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QUESTION 28
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?
A. use the mpls ldp auto-config command under the IGP routing process
B. use the mpls ldp sync command under the IGP routing process
C. use the interface all command under the MPLS LDP process
D. use the discovery command under the MPLS LDP process

Correct Answer: A Section: (none) Explanation
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QUESTION 29
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.

Correct Answer: BD Section: (none) Explanation Explanation/Reference:
Explanation:
QUESTION 30
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

Correct Answer: B Section: (none) Explanation
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QUESTION 31
Referring to the Cisco IOS XR configuration exhibit,

which labels will be advertised by the router with this configuration?
A. Only the label for 10.1.1.1/32 will be advertised to all the LDP peers.
B. Labels for all prefixes will be advertised to the 10.1.1.1 LDP peer.
C. Labels for all prefixes will be advertised to all the LDP peers.
D. No labels will be advertised to any LDP peers.

Correct Answer: A Section: (none) Explanation
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Explanation:
QUESTION 32
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

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation:
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

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
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

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation:
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.

Correct Answer: CDE Section: (none) Explanation
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