QUESTION 81
An engineer is troubleshooting a connectivity issue across the MPLS network and is verifying the forwarding behavior of packets. Which table does the engineer look at to verify the forwarding behavior of an IP packet as it enters the MPLS network at the ingress LSR?

A. LFIB
B. LIB
C. RIB
D. FIB

Correct Answer: D

QUESTION 82
You have configured MSDP peering between two autonomous systems that pass traffic between two sites, but the peering has failed to come up. Which task do you perform to begin troubleshooting the problem?

A. Verify that multicast has been disabled globally
B. Verify that PIM-DM is configured on the source interface
C. Verify that both source interfaces are reachable from both peers
D. Verify that the two MSDP peers allow asymmetric routing

Correct Answer: C

QUESTION 83
For which reason do you deploy BGP confederations within a BGP transit backbone?

A. to support a larger number of eBGP peer sessions
B. to increase the number of routes that can be redistributed between the running IGP and BGP
C. to reduce the number of eBGP routes that must be shared between autonomous systems
D. to reduce the number of iBGP peering sessions

Correct Answer: D

QUESTION 84
Which feature is used in multicast routing to prevent loops?

A. STP
B. inverse ARP
C. RPF
D. split horizon

Correct Answer: C

QUESTION 85
After you change the IP address on an IOS XR router, you cannot ping the new address. Which step did you forget to complete?

A. commit the configuration
B. roll back the configuration
C. merge the configuration
D. save the running configuration

Correct Answer: A

QUESTION 86
Which are two statements of route reflectors? (Choose two.)

A. Routes received from nonclient peers are reflected to route reflector clients as well as nonclient peers.
B. Routes received from nonclient peers are reflected to route reflector cluster as well as OSPF peers.
C. If a router received an iBGP route with the originator-ID attribute set to its own router ID, the route is discarded.
D. Routes received from a route reflector client is reflected to other clients and nonclient peers.
E. If a route reflector receives a route with a cluster-list attribute containing a different cluster ID, the route is discarded.

Correct Answer: CD

QUESTION 87
Which are two features of mapping multicast IP addresses to MAC address? (Choose two.)

A. All mapped multicast MAC addresses begin with 0x0100.5E
B. The router performs the mapping before it hands the packet off to a switch
C. All multicast MAC addresses end with 0x0100.5E
D. The mapping process may generate overlapping addresses, which can cause receivers to receive unwanted packets
E. All destination MAC addresses begin with an octet of binary 1s

Correct Answer: AD

QUESTION 88
You have configured routing policies on a Cisco IOS XR device with routing policy language. Which two statements about the routing policies are true? (Choose two.)

A. The routing policies affect BGP-related routes only.
B. If you make edits to an existing routing policy without pasting the full policy into the CLI, the previous policy is overwritten.
C. You can change an existing routing policy by editing individual statements.
D. The routing policies are implemented in a sequential manner.
E. The routing policies are implemented using route maps.

Correct Answer: CD

QUESTION 89
Which task is performed when troubleshooting LDP?

A. Execute the ping utility to generate information about the MAC addresses used along the path
B. Verify that MPLS is disabled globally and enabled on the necessary interfaces in a per-interface basis
C. Execute the traceroute utility to generate information about the labels used along the path
D. Verify that Cisco Express Forwarding has been disabled on the network

Correct Answer: C

QUESTION 90
What can be used to determine a path from the head-end to a tail-end router when implementing SR-TE with a head-end, with little information on the network topology?

A. traffic controller
B. path computation engine
C. tail-end router
D. SNMP server

Correct Answer: B