Cisco CCNP 300-510 Questions & Answers

• Question 21:

  Refer to the exhibit.

  

  .

  R1 is expected to receive routes originating from AS 65516 and from any ASs that are directly attached to it. However, R1 is receiving routes only from AS 65516. Which action corrects the configuration?

  A. Change the regular expression in the AS-path permit filter to .*.

  B. Change the regular expression in the AS-path permit filter to ^65516_[0-9]*$.

  C. Add the regular expression ^$. in the AS-path filter to permit the traffic from R2.

  D. Change the regular expression in the AS-path permit filter to _65516_.

  Correct Answer: B

• Question 22:

  Refer to the exhibit.

  

  R3 is: failing to accept multicast RP information from Domain-A advertising MSDP SA messages to R1 and R4

  receiving SA messages only from R4

  Which command must the engineer implement to resolve the issue?

  A. R3# ip msdp sa-filter in 192.168.3.1

  B. R3# no ip msap sa-filter in 192.168.1.1

  C. R3# no ip msdp peer 192.168.1.1

  D. R3# ip msdp sa-filter out 192.168.1.1

  Correct Answer: A

  Reference: https://allthingsnetworking.wordpress.com/2014/06/27/pim-msdp-sa-filter/

• Question 23:

  What is the difference between a source tree and a shared tree in a multicast environment?

  A. To route traffic from source to receiver a source tree uses a link-state routing protocol and a shared tree uses a distance-vector routing protocol.

  B. A source tree has its root at the source, and a shared tree has its root at a designated rendezvous point.

  C. To stream multicast from source to receiver, a source tree uses PIM-SM and a shared tree uses PIM-DM.

  D. Source trees are the default type for bidirectional PIM, and PIM-DM uses shared trees by default.

  Correct Answer: B

  Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16-5/imc-pim-xe-16-5-book/imc-tech-oview.html

• Question 24:

  Refer to the exhibit A. R1# ip msdp sa-filter in 192.168.3.1

  

  Router R1 is configured to advertise outgoing SA messages to routers R2 and R3, but to receive incoming SA messages only from R2. Which additional configuration must an engineer apply to router R1 so it filters all MSDP SA messages from Domain-C?

  B. R3# ip msdp sa-filter out 192.168.3.1

  C. R3# ip msdp password peer 192.168.1.1

  D. R1# ip msdp password peer 192.168.3.1

  Correct Answer: A

  Reference: https://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/13717-49.html

• Question 25:

  What is the difference between basic IS-IS and OSPF packet types?

  A. IS-IS and OSPF use area packets, but only IS-IS uses sequence number packets.

  B. IS-IS and OSPF use link-state update packets, but only OSPF uses link-state ACK packets.

  C. IS-IS and OSPF use Hello packets, but only OSPF uses DBD packets.

  D. IS-IS and OSPF use link-state update packets, but only IS-IS uses DBD packets.

  Correct Answer: C

  Reference: https://www.ciscopress.com/articles/article.asp?p=26850andseqNum=4

• Question 26:

  While configuring Cisco NSF awareness, a network engineer enters the bgp graceful-restart command after the BGP session is established in a router that runs IOS XE Software. Graceful restart capabilities are not exchanged. Which two actions should be taken? (Choose two.)

  A. Reload the router

  B. Verify that BGP route dampening is configured

  C. Reduce BGP convergence time

  D. Issue the clear ip bgp * command

  E. Issue the show ip bgp neighbors command.

  Correct Answer: AD

  Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-16/irg-xe-16-book/bgp-nonstop-forwarding-awareness.html

• Question 27:

  Which difference must an engineer consider when choosing whether to implement OSPF or IS-IS as the routing protocol on the network?

  A. The OSPF DR election process is deterministic, and the IS-IS DS election process is not deterministic.

  B. To support fast convergence, OSPF uses the LSA arrival timer and IS-IS uses the PRC-interval timer.

  C. IS-IS supports ordinary, stub, totally-stub, and NSSA areas, but OSPF supports only stub areas.

  D. IS-IS links are associated with either a Level 1 area or a Level 2 area at one time, but OSPF links are associated with multiple areas at one time.

  Correct Answer: B

  Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_isis/configuration/15-s/irs-15-s-book/irs-fscnt.html

• Question 28:

  Refer to the exhibit.

  

  Customer traffic from the branch site to the hub is experiencing packet drops. The engineer verified that:

  1.

  Customer traffic from the hub is able to reach the branch site.

  2.

  The connection between PE1 and PE2 is working normally.

  3.

  Routers P1 and P2 are able to ping devices on the hub site. Which action resolves the issue?

  A. Redistribute the CE1 OSPF routes in the PE1 VRF.

  B. Redistribute the CE2 OSPF routes in the PE2 VRF.

  C. Advertise the VPNv4 routes of the branch site in CE2.

  D. Advertise the VPNv4 routes of the hub in CE1.

  Correct Answer: D

• Question 29:

  Refer to the exhibit.

  

  After configuring IS-IS on routers R1 and R2, an engineer notices that only the loopback interface at 2000:1::1 /96 is known to router R2. Which change must be made so that only Loopback2 is advertised from R1 to R2?

  A. Configure the router isis area1 command under the Loopback0 interface on R1.

  B. Remove the advertise passive-only command under the IS-IS address family ipv6 configuration

  C. Remove the ipv6 router isis area1 command under the Loopback2 interface on R1.

  D. Remove the passive-interface Loopback0 command under the router isis area1 configuration.

  Correct Answer: C

• Question 30:

  Refer to the exhibit.

  

  A network engineer has divided AS into confederations. Due to repeated ASN, when the 10.0 0.0/8 prefix from R1 arrives to R2, BGP automatically rejects it. What should the engineer do to fix the problem so that BGP allows that prefix on R2?

  A. Configure the command as-override on R1.

  B. Configure the command allowas-in on R2.

  C. Configure the command allowas-in on all the PE routers.

  D. Configure the command as-override on R2.

  Correct Answer: B

  Reference: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/112236-allowas-in-bgp-config-example.html