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Implementing Cisco Service Provider Advanced Routing Solutions (SPRI) Questions 51–55 (page: 12)

Updated On: 10-Feb-2026

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?

  1. Configure the router isis area1 command under the Loopback0 interface on R1.
  2. Remove the advertise passive-only command under the IS-IS address family ipv6 configuration
  3. Remove the ipv6 router isis area1 command under the Loopback2 interface on R1.
  4. Remove the passive-interface Loopback0 command under the router isis area1 configuration.

Answer(s): C



Refer to the exhibit.


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

•Customer traffic from the hub is able to reach the branch site.
•The connection between PE1 and PE2 is working normally.
•Routers P1 and P2 are able to ping devices on the hub site.

Which action resolves the issue?

  1. Redistribute the CE1 OSPF routes in the PE1 VRF.
  2. Redistribute the CE2 OSPF routes in the PE2 VRF.
  3. Advertise the VPNv4 routes of the branch site in CE2.
  4. Advertise the VPNv4 routes of the hub in CE1.

Answer(s): D



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

  1. The OSPF DR election process is deterministic, and the IS-IS DS election process is not deterministic.
  2. To support fast convergence, OSPF uses the LSA arrival timer and IS-IS uses the PRC-interval timer.
  3. IS-IS supports ordinary, stub, totally-stub, and NSSA areas, but OSPF supports only stub areas.
  4. 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.

Answer(s): B



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.)

  1. Reload the router
  2. Verify that BGP route dampening is configured
  3. Reduce BGP convergence time
  4. Issue the clear ipbgp * command
  5. Issue the show ipbgpneighbors command.

Answer(s): A,D



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

  1. IS-IS and OSPF use area packets, but only IS-IS uses sequence number packets.
  2. IS-IS and OSPF use link-state update packets, but only OSPF uses link-state ACK packets.
  3. IS-IS and OSPF use Hello packets, but only OSPF uses DBD packets.
  4. IS-IS and OSPF use link-state update packets, but only IS-IS uses DBD packets.

Answer(s): C



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