300-420 practice questions 221–230

1. Question 221 · 359 in bank

   What is the purpose of the fabric management plane in a Cisco SD-Access architecture?

   • Acreate LISP-based ЕID for the end-to-end solution that is offered by SD-Access
   • Benable automation techniques for device deployments and configurations
   • Cenable EID-to-RLOC mapping that is based on the BGP protocol
   • Dcreate an underlay network that is based on the IS-IS routing protocol

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   Answer: B

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2. Question 222 · 359 in bank

   

   Refer to the exhibit. An engineer with an employee ID: 1234:56:789 must design a WoL deployment for a client, and the design must ensure that the Windows PCs are responsive to the WoL magic packets with no delays when the server-side initiates the instruction. Which action must the engineer choose?

   • AIP-directed broadcast must be disabled on all interfaces where clients reside.
   • BWoL must be enabled on the networking card and disabled in the Windows PCs BIOS.
   • CSpanning-tree PortFast must be enabled on all interfaces where clients reside.
   • DIP forward protocol must be disabled on all interfaces where clients reside.

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   Answer: C

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3. Question 223 · 359 in bank

   Select 2

   Which two considerations must be made regarding the overlay network for a Cisco SD-Access architecture? (Choose two.)

   • AVirtual networks should be used for microsegmentation.
   • BOverlapping IP addresses across different overlay networks should be used to conserve IP addresses.
   • COverlapping IP addresses across different overlay networks should be avoided for operational simplicity.
   • DSGTs should be used for data plane isolation and microsegmentation.
   • EVirtual networks should be used for data plane isolation only.

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   Answer: CD

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4. Question 224 · 359 in bank

   An enterprise needs to enhance its WAN availability after a recent outage with its only MPLS provider. The proposed solution must have a quick deployment, be affordable, be reliable, and work as a backup for the enterprise's primary MPLS connection. Which solution meets these requirements?

   • ADeploy an additional WAN router and use a floating static route.
   • BContract an internet connection and deploy DMVPN.
   • CDeploy BFD echo mode and probe provider PE.
   • DContract another MPLS provider and deploy GET VPN.

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   Answer: B

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5. Question 225 · 359 in bank

   Select 2

   A company is planning to open two new branches and allocate the 2a01:c30:16:7009::3800/118 IPv6 network for the region. Each branch should have the capacity to accommodate a maximum of 200 hosts. Which two networks should the company use? (Choose two.)

   • A2a01:0c30:0016:7009::3a00/120
   • B2a01:0c30:0016:7009::3b00/121
   • C2a01:0c30:0016:7009::3a80/121
   • D2a01:0c30:0016:7009::3c00/120
   • E2a01:0c30:0016:7009::3b00/120

   Show answer

   Answer: AE

   Explanation

   Answers A, E are correct: Network range for 2a01:c30:16:7009::3800/118 2a01:0c30:0016:7009:0000:0000:0000:3800- 2a01:0c30:0016:7009:0000:0000:0000:3bff Network Range for 2a01:0c30:0016:7009::3a00/120 2a01:0c30:0016:7009:0000:0000:0000:3a00- 2a01:0c30:0016:7009:0000:0000:0000:3aff Network range for 2a01:0c30:0016:7009::3b00/120 2a01:0c30:0016:7009:0000:0000:0000:3b00- 2a01:0c30:0016:7009:0000:0000:0000:3bff (As you see it ends with 2a01:0c30:0016:7009:0000:0000:0000:3bff So that means 2a01:0c30:0016:7009:0000:0000:0000:3c00/120 is out of the picture)

   Source: Adapted from community discussion — Sickcnt

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6. Question 226 · 359 in bank

   What is the purpose of Cisco vBond as a Session Traversal Utilities for NAT server?

   • Asecure data traffic between Cisco Catalyst SD-WAN edge routers that use IPsec
   • Bintegrate Cisco SD-Access Wireless into the fabric
   • Callow Cisco Catalyst SD-WAN routers to locate their own mapped IP addresses
   • Dprovide Zero-Touch Provisioning to Cisco Catalyst SD-WAN vEdge devices

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   Answer: C

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7. Question 227 · 359 in bank

   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?

   • AEnable IS-IS remote LFA FRR on both devices.
   • BEnable NSR on the switch.
   • CEnable NSF on the switch.
   • DConfigure ISIS aggressive timers on both devices.

   Show answer

   Answer: B

   Explanation

   Graceful Restart (GR) (also known as Non Stop Forwarding (NSF)) and Non Stop Routing (NSR) are two different mechanisms to prevent routing protocol re-convergence during a processor switchover. When Graceful Restart (NSF) is used, peer networking devices are informed, via protocol extensions prior to the event (so peers should also be NSF (GR) capable). The peer routers are aware of a failure and so will give the switching over router a "grace" period to re-establish the neighbor relationship, while continuing to forward to the routes from that peer. When NSR is used, peer networking devices have no knowledge of any event on the switching over router. All information needed to continue the routing protocol peering state is transferred to the standby processor so it can "pick up" immediately upon a switchover. NSR is desirable in cases where the routing protocol peer doesn't support the RFCs necessary to support Graceful Restart. Following this logic, the answer is B (NSR)

   Source: Adapted from community discussion — Mohali98

   References

   • cisco.com documentation

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8. Question 228 · 359 in bank

   Select 2

   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.)

   • AUse BGP to IS-IS redistribution to advertise all Internet routes in the Level 1 area.
   • BAdvertise the IS-IS interface and loopback IP address toward the Internet and data center.
   • CReduce SPF and PRC intervals to improve convergence time.
   • DConfigure all access and aggregate routers to establish Level 1 / Level 2 adjacencies across the network.
   • EConfigure access routers to establish a Level 1 adjacency and aggregate routers to establish a Level 1 / Level 2 adjacency.

   Show answer

   Answer: CE

   Explanation

   C and E seems to be the correct Answers: Answer C should be responsible for timer optimalization Answer E should be the proper design in an "IS-IS Hybrid topology design" (L1/L2 routers maintain a separate lin-state database for L1 routes and L2 routes > This increases their CPU > So Access routes should never be both L1/L2 devices, only pure L1 devices) (Source ENSLD 300-420 official cert book page: 119)

   Source: Adapted from community discussion — Sickcnt

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9. Question 229 · 359 in bank

   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?

   • AAdd aggregation layer between core and access networks.
   • BEnable graceful restart on routers A and C.
   • CEnable FRR for the connected networks of routers A and C.
   • DEnable summarization on routers A and C.

   Show answer

   Answer: C

   Explanation

   The answers are B & C GraceFul Restart a feature in EIGRP that allows a router to gracefully restart without disrupting network traffic. When a router is configured for graceful restart, it will send a notification to its neighbors before it restarts. This allows the neighbors to prepare for the restart by building alternate routes to the networks that the router is advertising, it won't impact the core this way. For Fast Convergence: (FRR) is a feature in EIGRP that allows a router to quickly reroute traffic around a failed link. FRR uses a technique called Feasible Successors to pre-calculate backup routes that can be used in the event of a link failure.

   Source: Adapted from community discussion — Clauster

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10. Question 230 · 359 in bank

    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?

    • AModify the next-hop attribute on R3.
    • BUse AS-Path prepending on R3.
    • CModify the next-hop attribute on R4.
    • DUse AS-Path prepending on R4.

    Show answer

    Answer: D

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300-420 practice, question 221. 359 questions available.