web analytics

New Passleader Cisco 642-780 Practice Tests Dumps Download For Free (41-50)

QUESTION 41
You have been asked to verify if the OSPF protocol is enabled for Layer 3 MPLS VPN service on the link between the PE and CE. Assume the PE is running on Cisco IOS XR software. Which command should be used to verify that the OSPF protocol is enabled for Layer 3 MPLS VPN service on a link between a PE router and a CE router?

A.    show ip ospf interface brief
B.    show vrf VRFNAME detail
C.    show ospf vrf VRFNAME interface brief
D.    show ospf interface brief
E.    show ip protocols

Answer: C

QUESTION 42
Which command is most likely to be useful when you troubleshoot a unidirectional connectivity problem on a VC?

A.    show mpls l2transport vc
B.    show mpls l2transport vc detail
C.    show mpls l2transport checkpoint
D.    show mpls l2transport summary

Answer: B

QUESTION 43
What Cisco IOS command should be used to obtain tunnel statistics for dynamically created primary tunnels?

A.    show mpls traffic-eng tunnels auto-bw brief
B.    show mpls traffic-eng tunnels
C.    show mpls traffic-eng tunnels statistics
D.    show mpls traffic-eng topology

Answer: B

QUESTION 44
You are troubleshooting a Layer 3 VPN issue between three sites (site A, site B, and site C) connected in a full mesh topology. You use the show bgp vrf VRFNAME command on the PE router (Cisco IOS XR based devices) connected to site B and you find out that the only routes present are from the two remote sites (site A and site C). What are three possible causes for the routing issue? (Choose three.)

A.    Network commands are missing under MP-BGP in remote PE routers.
B.    The redistribute command is missing under MP-BGP in remote PE routers.
C.    Network commands are missing under MP-BGP in the local PE router.
D.    The BGP neighbor prefix limit is configured on the local PE router.
E.    The BGP neighbor prefix limit is configured on remote PE routers.
F.    The redistribute command is missing under MP-BGP in the local PE router.

Answer: CDF

QUESTION 45
You are using VPLS service to transport video across different points in your network. VPLS circuits are discovered automatically using the MP-BGP. A new PE device was added to the network, but VPLS circuits were not discovered by the new PE device. Assuming that PE devices are running Cisco IOS, what two important things must you look for to identify the issue? (Choose two.)

A.    The VPNv4 VPLS address family is enabled under BGP.
B.    The Layer 2 VPN VPLS address family is enabled under BGP.
C.    The IPV4 address family is enabled under BGP.
D.    The extended BGP communities are enabled under BGP.
E.    The maximum route limit is configured under BGP.

Answer: BD

QUESTION 46
The SP NOC has determined that a significant number of broadcast packets are being received from customer A, which could be a DoS attack. Customer A is using the MPLS Layer 2 VPLS services. The excessive broadcast traffic is causing degraded performance and over-utilizing the access links. Which of the Cisco IOS XR MPLS Layer 2 configuration parameters can be used to mitigate the problem?

A.    the storm-control parameter under the l2vpn bridge group
B.    the storm-control parameter under the l2vpn xconnect group
C.    the limit-broadcast parameter under the l2vpn bridge group
D.    the limit-broadcast parameter under the l2vpn xconnect

Answer: A

QUESTION 47
In a Service Provider Layer 3 MPLS VPN implementation, what is the minimum number of routing or distribution protocols running on the PE routers?

A.    three
B.    four
C.    five
D.    six

Answer: A

QUESTION 48
How does a Label Switch Router recognize the label at the bottom of a label stack?

A.    The bottom-of-stack bit is set.
B.    The TTL field contains the number 1.
C.    The EXP field contains the number 1.
D.    The last bit in the label field is cleared in the bottom label.

Answer: A

QUESTION 49
Which protocol must be enabled to successfully deploy Layer 3 MPLS VPNs?

A.    OSPF
B.    IS-IS
C.    EIGRP
D.    MP-BGP
E.    RSVP

Answer: D

QUESTION 50
What function does PCALC perform for MPLS TE?

A.    Properly load balances data over MPLS TE tunnels.
B.    Calculates the shortest path based on more than cost.
C.    Tracks the performance of core routers for MPLS TE tunnels.
D.    It is the calculation used to determine if a router has the resources to accept an RSVP request.

Answer: B

New Passleader Cisco 642-780 Practice Tests Dumps Download For Free