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  1. Home
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  3. 300-420

Cisco® 300-420 Exam (page: 8)
Cisco® Designing Enterprise Networks (ENSLD)
Updated on: 02-Jan-2026

Viewing Page 8 of 59
300-420 PDF 386 Questions

Refer to the exhibit.



A network engineer must improve the current IS-IS environment. The Catalyst switch is equipped with dual supervisors. Each time a stateful switchover occurs, the network experiences unnecessary route recomputation. Which solution addresses this issue if the upstream router does not understand graceful restart messaging?

  1. Enable IS-IS remote LFA FRR on both devices.
  2. Enable NSR on the switch.
  3. Enable NSF on the switch.
  4. Configure ISIS aggressive timers on both devices.

Answer(s): C



Refer to the exhibit.



An architect must design an IGP solution for an enterprise customer. The design must support:

-Physical link flaps should have minimal impact.
-Access routers should converge quickly after a link failure.

Which two ISIS solutions should the architect include in the design? (Choose two.)

  1. Use BGP to IS-IS redistribution to advertise all Internet routes in the Level 1 area.
  2. Advertise the IS-IS interface and loopback IP address toward the Internet and data center.
  3. Reduce SPF and PRC intervals to improve convergence time.
  4. Configure all access and aggregate routers to establish Level 1 / Level 2 adjacencies across the network.
  5. Configure access routers to establish a Level 1 adjacency and aggregate routers to establish a Level 1 / Level 2 adjacency.

Answer(s): C,E



Refer to the exhibit.



An engineer is designing a routing solution for a customer. The design must ensure that a failure of network 10.1.0.0/24, 10.1.2.0/24, 10.2.1.0/24, or 10.2.3.0/24 does not impact the core. It also requires fast convergence time during any link failover in the core or access networks.
Which solution must the engineer select?

  1. Add aggregation layer between core and access networks.
  2. Enable graceful restart on routers A and C.
  3. Enable FRR for the connected networks of routers A and
  4. Enable summarization on routers A and C.

Answer(s): C



Refer to the exhibit.



A network engineer is designing a network for AS100. The design should ensure that all traffic enters AS100 via link 1 unless there is a network failure. In the event of a failure, link 2 should function as the path for incoming traffic. Which solution should the design include?

  1. Modify the next-hop attribute on R3.
  2. Use AS-Path prepending on R3.
  3. Modify the next-hop attribute on R4.
  4. Use AS-Path prepending on R4.

Answer(s): D



Refer to the exhibit.



An architect must design a solution that uses the direct link between R1 and R2 for traffic from 10.10.10.0/24 toward network 10.10.20.0/24. Which solution should the architect include in the design?

  1. Configure the OSPF cost of the link to a value lower than 30.
  2. Lower the Administrative Distance for OSPF area 0.
  3. Place the link into area 2 and install a new link between R1 and R2 in area 0.
  4. Configure the link to provide multiarea adjacency.

Answer(s): D



Viewing Page 8 of 59



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