300-420 practice questions 211–220

1. Question 211 · 359 in bank

   When is it advisable to provide dedicated control plane nodes within a Cisco SD-Access design?

   • Ain a small deployment where border nodes are not required
   • Bwhen there is a requirement for frequent roaming of endpoints across fabric edge nodes
   • Cin designs without Cisco DNA Center
   • Din a design where fabric edge nodes are unable to provide control plane functionality

   Show answer

   Answer: B

   Explanation

   The correct answer is: B. when there is a requirement for frequent roaming of endpoints across fabric edge nodes Explanation: In Cisco SD-Access, dedicated control plane nodes are recommended when there is a need for scalability and to support features like frequent roaming of endpoints. This ensures that the control plane can manage the mapping database efficiently, avoiding potential performance issues that might arise if control plane functionality were distributed across fabric edge nodes. Option D (in a design where fabric edge nodes are unable to provide control plane functionality) could also seem relevant, but the best answer for scalability and optimal performance, especially for endpoint mobility, is B.

   Source: Adapted from community discussion — PicoOstrava

   References

   • Cisco documentation

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2. Question 212 · 359 in bank

   

   Refer to the exhibit. An architect must design a solution to connect the two ASs. To optimize bandwidth, the design will implement load sharing between router R6 and router R1. Which solution should the design include?

   • AUse update-source to specify the Loopback interface.
   • BUse next-hop-self attributes only for routes that are learned from eBGP peers.
   • CConfigure the eBGP TTL to support eBGP multihop.
   • DUse maximum-paths to install multiple paths in the routing table.

   Show answer

   Answer: D

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3. Question 213 · 359 in bank

   An architect must design a QoS model for a business-critical application that is delay-sensitive and requires high bandwidth. The company’s head office hosts the application, and DMVPN tunnels protected with IPsec provide connectivity between the head office and branches. Which solution must the architect choose?

   • ADiffServ
   • BRSVP
   • CIntServ
   • DWRED

   Show answer

   Answer: B

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4. Question 214 · 359 in bank

   

   Refer to the exhibit. A network architect is preparing a network design based on the EIGRR. Routers are connected using a cat6a cable type and the inter-router connection speed is limited to 10 Mbps due to distance. During the pilot phase, a DUAL-3-SIA error message is visible. Which action must the engineer take to create a stable design?

   • AConfigure STUB area on R4.
   • BEnable poison reverse on R4.
   • CDisable split horizon on R1.
   • DCreate a summary route on R2.

   Show answer

   Answer: D

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5. Question 215 · 359 in bank

   What is an advantage of using model-driven telemetry in the network?

   • AIt uses interrupt-driven polling to pull data at regular intervals.
   • BIt uses MIB models to structure the data that are well known in the industry.
   • CIt uses JSON encoding and is compatible with a wide variety of tools on the market.
   • DTelemetry obtains data by parsing the CLI output from show commands.

   Show answer

   Answer: A

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6. Question 216 · 359 in bank

   

   Refer to the exhibit. An architect is designing an IPv4 plan using the 172.16.0.0/16. The design must maximize the number of subnets while meeting these requirements: • 500 hosts within the server room • 100 hosts at the remote site • 25 hosts at the access site Which plan must the architect choose?

   • A• Server room 172.16.8.0/21 • Remote site 172.16.10/23 • Access site 172.16.10.128/25
   • B• Server room 172.16.2.0/23 • Remote site 172.16.4.128/25 • Access site 172.16.5.32/27
   • C• Server room 172.16.2.0/23 • Remote site 172.16.4.64/26 • Access site 172.16.5.16/28
   • D• Server room 172.16.4.0/22 • Remote site 172.16.9.0/24 • Access site 172.16.9.64/26

   Show answer

   Answer: B

   Explanation

   Option B: Server room: 172.16.2.0/23 (provides 512 IPs — good for 500 hosts). Remote site: 172.16.4.128/25 (provides 128 IPs — good for 100 hosts). Access site: 172.16.5.32/27 (provides 32 IPs — good for 25 hosts). This option meets all the requirements and is very efficient in terms of IP address allocation

   Source: Adapted from community discussion — PicoOstrava

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7. Question 217 · 359 in bank

   An architect must design a topology for a WAN network that satisfies these requirements: • Devices must be able to make informed decisions. • Suboptimal paths are allowed only in case of a failure. • Backup paths must always be available. Which topology must the architect select?

   • Afull mesh
   • BClos
   • Cpartial mesh
   • Dhub and spoke

   Show answer

   Answer: A

   Explanation

   D. Hub and Spoke: This topology is the least ideal because it has a single central hub to which all spokes are connected. If the hub fails, all spokes lose connectivity. While it may have a backup path in some designs, it's not as resilient as a full mesh.

   Source: Adapted from community discussion — PicoOstrava

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8. Question 218 · 359 in bank

   A customer's environment includes hosts that support IPv6-only. Several of these hosts must communicate with a public web server that has only IPv4 domain name resolution. Which solution should the customer use in this environment?

   • Autilize NAT64 to translate the addresses
   • Bimplement NAT44 at the edge of the customer network
   • Cuse 6to4 and a tunnel to translate the addresses
   • Dimplement 6PE to resolve hostname resolution

   Show answer

   Answer: A

   Explanation

   NAT64 is a mechanism for IPv4-to-IPv6 transition and IPv4-IPv6 coexistence. Together with DNS64, the primary purpose of NAT64 is to allow an IPv6-only client to initiate communications to an IPv4-only server.NAT64 can also be used for IPv4-only clients initiating communications with IPv6-only servers using static or manual bindings

   Source: Adapted from community discussion — eva27

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9. Question 219 · 359 in bank

   Select 2

   

   Refer to the exhibits. An engineer is troubleshooting an issue in which the Gig0/2 interface on a Cisco switch named SW2 fails to become the root port. Which two commands must be run on SW2 to resolve this issue? (Choose two.)

   

   • ASW2(config-if)# no spanning-tree cost 4
   • BSW2(config)# interface Gig0/2
   • CSW2(config-if)# spanning-tree cost 4
   • DSW2(config)# interface Fa0/3
   • ESW2(config-if)# spanning-tree cost 5

   Show answer

   Answer: AD

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10. Question 220 · 359 in bank

    Select 2

    When expanding an existing Cisco SD-Access network, in addition to the control plane, which two device roles are needed to create an additional fabric site? (Choose two.)

    • Aleaf
    • BWLC
    • Cedge
    • Dborder
    • EcEdge

    Show answer

    Answer: CD

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300-420 practice, question 211. 359 questions available.