Cisco CCNP 300-515 Questions & Answers

• Question 41:

  While troubleshooting EoMPLS configuration problems, which three parameters should an engineer match between the two ends of the pseudowire configurations? (Choose three.)

  A. VLAN name

  B. Xconnect group name

  C. EFP subinterface number

  D. pseudowire ID

  E. MTU size

  F. control word usage

  Correct Answer: DEF

  Reference: https://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/213238-mpls-l2vpn-pseudowire.html

• Question 42:

  

  Refer to the exhibit. Which result occurs when PE1 learns a new MAC address and all three PEs are enabled with EVPN native?

  A. A system notification is sent to the network administrator that triggers the manual configuration of the new MAC address on PE2 and PE3.

  B. The new MAC address is sent by BGP to PE2 and PE3 as a Type 2 BGP route.

  C. The MAC address is entered into the CAM table and is classified for use on the native VLAN

  D. The MAC address is entered into the CAM table only if it is learned on the native VLAN.

  Correct Answer: B

  Reference: https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-4/lxvpn/configuration/guide/b-l2vpn-cg-asr9000-64x/b-l2vpn-cg-asr9000-64x_chapter_01011.html

• Question 43:

  

  Refer to the exhibit. An engineer is trying to configure an EVPN VWPS. What is the issue with this configuration?

  A. The member in the VPWS context should be the PE-facing interface.

  B. The 12vpn evpn command should be instance 101.

  C. Interface GigabitEthernet0/1/0 should not have any IP address.

  D. The service instance and the EVPN instance are different.

  Correct Answer: C

  Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l2_vpns/configuration/xe-3s/asr903/16-7-1/b-mpls-l2-vpns-xe-16-7-asr900/epvn_vpws_single_homed.pdf

• Question 44:

  What do EVPN single-active and all-active have in common?

  A. They are default gateway redundancy options.

  B. They are multihoming mechanisms used for CE devices.

  C. They are used to provide single connection from a CE device to a service provider.

  D. They are both roles that a designated router can take when MPLS is used with EVPN.

  Correct Answer: D

  Reference: https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-2/lxvpn/configuration/guide/b-l2vpn-cg-asr9000-62x/b-l2vpn-cg-asr9000-62x_chapter_01011.html

• Question 45:

  Which mechanism reduces the network flooding caused by host ARP learning behavior?

  A. ARP suppression

  B. storm control

  C. root guard

  D. BPDU guard

  Correct Answer: A

  Reference: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white-paper-c11-735015.html

• Question 46:

  While troubleshooting an AToM L2VPN service, a network consultant notices that the AC Layer 2 encapsulations are different. Which action should the consultant take in order to make the MPLS L2VPN work?

  A. tag-rewrite on the ingress and egress PE router

  B. interworking IP configuration on the last PE router before label disposition

  C. nonrouted interworking setup to properly translate only the Layer 2 information from the AC

  D. interworking IP configuration on both the AC terminations on the PEs

  Correct Answer: D

  Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l2_vpns/configuration/xe-16-11/mp-l2-vpns-xe-16-11-book/l2vpn-interworking.html

• Question 47:

  Which two are characteristics of using a non-MPLS peer-to-peer model over a traditional overlay model? (Choose two.)

  A. The model is suited for nonredundant configurations.

  B. The configuration on a newly added site PE is updated automatically.

  C. Provider routers know the customer network topology.

  D. The customer specifies the exact site-to-site traffic profile.

  E. Routing information is exchanged between the customer router and one or a few PEs.

  Correct Answer: CE

  Reference: http://etutorials.org/Networking/MPLS+VPN+Architectures/Part+2+MPLS-based+Virtual+Private+Networks/Chapter+7.+Virtual+Private+Network+VPN+Implementation+Options/Overlay+and+Peer-to-peer+VPN+Model/

• Question 48:

  You are troubleshooting ARP connectivity issues for an Ethernet interface on an IOS XR network that runs IS-IS. You verify that the IGP protocol is running, but an ARP entry has not yet been created. Which action should you take?

  A. debug ping packets

  B. debug ARP

  C. ping the connected neighbor

  D. verify the RIB table routes

  Correct Answer: C

• Question 49:

  The CTO of a company requires the support of a network consultant to deliver an MPLS solution without resigning to a certain degree of redundancy and scalability. Which solution effectively scales to hundreds or thousands of sites?

  A. L2VPN with the broadcast traffic processed at the ingress PE.

  B. L3VPN with direct LSP connectivity between all PEs.

  C. L2VPN by encapsulating multiple frame formats with interworking.

  D. L3VPN using a hierarchical topology of N-PEs and U-PEs.

  Correct Answer: D

• Question 50:

  You try to configure MPLS VPN VRF Selection based on a source IP address on an interface that has VRF configured, but you receive an error. Which action must you take to correct the problem?

  A. Change the source IP address.

  B. Add the IP address to the VRF table.

  C. Remove the VRF from the interface.

  D. Configure static routes for the VRF.

  Correct Answer: C

  Reference: https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/vrfselec.html