300-420 practice questions 281–290

1. Question 281 · 359 in bank

   Select 2

   

   Refer to the exhibit. An engineer must design an automatic failover solution. The solution should allow HSRP to detect a WAN 1 failure and initiate an automatic failover, making router R2 the active HSRP router. Which two solutions should the engineer choose? (Choose two.)

   • Aimplement IP SLA on router R1
   • Bimplement PBR on router R1
   • Cimplement Enhanced Object Tracking on router R1
   • Duse IP source routing
   • Euse a floating static route

   Show answer

   Answer: AC

   Explanation

   A. Implement IP SLA on router R1 C. Implement Enhanced Object Tracking on router R1 Explanation: To achieve automatic failover with HSRP, you can use Enhanced Object Tracking (EOT) and IP SLA. EOT is a feature that enables tracking of a configurable object and can modify HSRP priority or state based on the status of the tracked object. IP SLA is a feature that generates and sends synthetic traffic to a specified destination and can trigger EOT based on the status of the tracked object. By configuring IP SLA on router R1 to track WAN 1 and then configuring EOT on R1 to decrement the HSRP priority or change the HSRP state, you can achieve automatic failover to router R2 in the event of a WAN 1 failure.

   Source: Adapted from community discussion — SpicyMochi

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2. Question 282 · 359 in bank

   Which topology within a network underlay eliminates the need for first hop redundancy protocols while improving fault tolerance, increasing resiliency, and simplifying the network?

   • Avirtualized topology
   • Brouted access topology
   • CLayer 2 topology
   • Dlogical fabric topology

   Show answer

   Answer: B

   Explanation

   OCG: "Using a routed access design prevents the need to run STP, VTP, and FHRP in the underlay network. Instead, you can use a logical fabric over the top of the underlay, which provides routing protocol benefits such as multipath routing, fast convergence, and ease of management."

   Source: Adapted from community discussion — [Removed]

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3. Question 283 · 359 in bank

   Refer to the exhibit.

   

   A customer is running HSRP on the core routers. Over time the company has grown and requires more network capacity. In the current environment, some of the downstream interfaces are almost fully utilized, but others are not. Which solution improves the situation?

   • AMake router R2 active for half of the VLANs.
   • BAdd more interfaces to R1 and R2.
   • CConfigure port channel toward downstream switches.
   • DEnable RSTP on the downstream switches.

   Show answer

   Answer: A

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4. Question 284 · 359 in bank

   Select 2

   When a network is designed using IS-IS, which two circuit types are supported? (Choose two.)

   • Anonbroadcast multiaccess
   • Bmultiaccess
   • Cpoint-to-multipoint
   • Dnonbroadcast
   • Epoint-to-point

   Show answer

   Answer: BE

   Explanation

   B, E are correct. In the 300-420 Cert Guide - Chapter 3 "Routing Protocol Characteristics, EIGRP, and IS-IS" - "IS-IS Interface Types" on page 117 it states: "IS-IS only has two network types (or interface types): point-to-point and broadcast."

   Source: Adapted from community discussion — iLikeHamburgers

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5. Question 285 · 359 in bank

   Refer to the exhibit.

   

   An engineer is designing an OSPF solution with these requirements: • NMS server will manage R5 and R6. • Upon failure of R1, all NMS traffic should be routed through R4. • Upon failure of the link between R5 and R6, all traffic destined for 10.6.6.6 should be routed through R4. Which solution must the engineer choose?

   • ARedistribute OSPF process 1 into process 2 on R1 and R4.
   • BAdvertise 172.16.1.1 into OSPF process 1 with high cost on R1.
   • CApply static routes on R2 and R3 with IP SLA tracking toward R5 and R6.
   • DEnable the default-information originate command with a higher metric on R2 to R1.

   Show answer

   Answer: A

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6. Question 286 · 359 in bank

   An architect must develop a campus network solution that includes: ✑ logically segmented and isolated networks ✑ ability to communicate between network segments when required ✑ support for overlapping IP addresses ✑ widely available technologies to avoid purchasing specialized equipment Which solution must the architect select?

   • AVSS with IGP
   • B802.1Q with HSRP
   • CvPC with HSRP
   • DVRF-Lite with OSPF

   Show answer

   Answer: D

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7. Question 287 · 359 in bank

   Which feature is used to optimize WAN bandwidth of IGMP network traffic among WAN Edge routers in the same VPN?

   • AIGMPv2
   • Bmulticast RP
   • Cmulticast-replicator
   • Dmulticast service routes

   Show answer

   Answer: C

   Explanation

   I think C: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/bridging-routing-segmentation-qos/vedge/bridging-routing-segmentation-qos-book/multicast-overlay-routing.html Replicators For efficient use of WAN bandwidth, strategic vEdge routers can be deployed and configured as replicators throughout the overlay network. Replicators mitigate the requirement for an ingress router to replicate a multicast stream once for each receiver.

   Source: Adapted from community discussion — Hope66

   References

   • Cisco documentation

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8. Question 288 · 359 in bank

   Which consideration must be made when designing a Cisco SD-Access fabric underlay?

   • ASubnets must be reduced to decrease latency.
   • BUp to six control planes are supported.
   • CThe default MTU should be increased.
   • DA unified policy must be used.

   Show answer

   Answer: C

   Explanation

   I agree that a maximum of sic controlplane-NODES are supported. But six control planes? I thing the right answer is C. Due to the extra VXLAN header the default MTU size must be increased. 9100 bytes is the default for SD-ACCESS i think.

   Source: Adapted from community discussion — Reinier_veen

   References

   • Cisco documentation

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9. Question 289 · 359 in bank

   Select 2

   Which two functions does the control plane node provide in a Cisco SD-Access architecture? (Choose two.)

   • ALISP proxy ETR
   • Bhost tracking database
   • Cpolicy mapping
   • Dmap server
   • Eendpoint registration

   Show answer

   Answer: BD

   Explanation

   The control plane node enables the following functions: Host tracking database—The host tracking database (HTDB) is a central repository of EID-to-fabric-edge node bindings. Map server—The LISP MS is used to populate the HTDB from registration messages from fabric edge devices. Map resolver—The LISP MR is used to respond to map queries from fabric edge devices requesting RLOC mapping information for destination EIDs.

   Source: Adapted from community discussion — J2J2J2J

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10. Question 290 · 359 in bank

    A company wants to switch from static to dynamic routing. The branches use DMVPN back to the hub using two internet connections. One internet connection speed is 10 Mbps, and the other is 100 Mbps. All locations use Cisco routers; however, the branch routers have limited memory and CPU resources. Which routing protocol and design solution must the company choose for optimal traffic forwarding during peak traffic times?

    • AOSPF deployed in area 0 with branch routers connected back via virtual links
    • BEIGRP with branch routers as stub routers and variance enabled
    • CISIS with the hub and spoke routers configured in two different areas
    • DiBGP with the hub routers set up as route reflectors

    Show answer

    Answer: B

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300-420 practice, question 281. 359 questions available.