300-420 practice questions 261–270

1. Question 261 · 359 in bank

   How is a sub-second failure of a transport link detected in a Cisco SD-WAN network?

   • AHellos are sent between the WAN Edge routers and the vSmart controller.
   • BBFD runs on the IPsec tunnels between WAN Edge routers.
   • CBGP is used between WAN Edge routers and the vSmart controller.
   • DLink state change messages are sent between vSmart controllers.

   Show answer

   Answer: B

   Explanation

   Provided answer is correct https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/Monitor-And-Maintain/monitor-maintain-book/m-network.html BFD Protocol The Role of BFD in Cisco SD-WAN Solution The BFD protocol detects links failures between routers. It measures data loss and latency on the data tunnel to determine the status of the devices at either end of the connection. For data plane resiliency, the Cisco SD-WAN software implements the BFD protocol, which runs automatically on the secure IPsec and GRE connections between routers. These connections are used for the data plane, and for data traffic, and are independent of the DTLS tunnels used by the control plane.

   Source: Adapted from community discussion — XalaGyan

   References

   • Cisco documentation

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2. Question 262 · 359 in bank

   Select 2

   

   Refer to the exhibit. Which two solutions maximize the use of the links between the core and distribution layers? (Choose two.)

   • Ause multiple equal-cost links
   • Buse an IGP
   • Cuse HSRP
   • Duse RPVSTP+
   • Euse multiple unequal-cost links

   Show answer

   Answer: AB

   Explanation

   Refer to the exhibit. Which two solutions maximize the use of the links between the core and distribution layers? (Choose two.) A. use multiple equal-cost links ==> looks good B. use an IGP ==> is mandatory to do equal/non-equal load balancing C. use HSRP ==> not bad but that is First Hop Failure and belongs between Access and Distribution layer D. use RPVSTP+ ==> layer 2 technology, has nothing to do between those layers E. use multiple unequal-cost links ==> nice but to make that decision more details of the links are needed and since they are not given, A is the better choice Answer: AB

   Source: Adapted from community discussion — XalaGyan

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3. Question 263 · 359 in bank

   Select 2

   Which are two Cisco recommendations that demonstrates SDA? (Choose two.)

   • AFocus on business benefits.
   • BBe sure you explain the major technologies such as VXLAN and LISP in depth.
   • CShow the customer how to integrate ISE into DNA Center at the end of the demo.
   • DKeep the demo at a high level.
   • EUse the CLI to perform as much of the configuration as possible.

   Show answer

   Answer: AD

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4. Question 264 · 359 in bank

   Select 2

   A customer's current Layer 2 infrastructure is running Spanning Tree 802.1d, and all configuration changes are manually implemented on each switch. An architect must redesign the Layer 2 domain to achieve these goals: * reduce the impact of topology changes * reduce the time spent on network administration * reduce manual configuration errors Which two solutions should the architect include in the new design? (Choose two.)

   • AImplement Rapid PVST+ instead of STP.
   • BImplement MST instead of STP.
   • CUse VTP to propagate VLAN information and to prune unused VLANs.
   • DConfigure broadcast and multicast storm control on all switches.
   • EConfigure dynamic trunking protocol to propagate VLAN information.

   Show answer

   Answer: AC

   Explanation

   A. Implement Rapid PVST+ instead of STP. C. Use VTP to propagate VLAN information and to prune unused VLANs. To achieve the stated goals of reducing the impact of topology changes, reducing the time spent on network administration, and reducing manual configuration errors, the architect should implement the following solutions: A. Implement Rapid PVST+ (Per VLAN Spanning Tree Plus) instead of STP (Spanning Tree Protocol). Rapid PVST+ is based on the IEEE 802.1w standard (Rapid Spanning Tree Protocol) and converges faster than the traditional 802.1d STP. This will help to reduce the impact of topology changes. C. Use VTP (VLAN Trunking Protocol) to propagate VLAN information and to prune unused VLANs. VTP is a Cisco proprietary protocol that simplifies VLAN administration across multiple switches by automatically distributing VLAN configuration information. This reduces the time spent on network administration and the potential for manual configuration errors.

   Source: Adapted from community discussion — SpicyMochi

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5. Question 265 · 359 in bank

   Which feature is supported on the Cisco vEdge platform?

   • Asingle sign-on
   • BIPv6 transport (WAN)
   • Clicense enforcement
   • D2-factor authentication
   • Ereporting
   • Fnon-Ethernet interfaces

   Show answer

   Answer: B

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6. Question 266 · 359 in bank

   Which component is part of the Cisco SD-Access overlay architecture?

   • Aborder node
   • Bspine node
   • Cleaf node
   • DCisco DNA Center

   Show answer

   Answer: A

   References

   • Cisco documentation

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7. Question 267 · 359 in bank

   How are wireless endpoints registered in the HTDB in a Cisco SD-Access architecture?

   • ABorder nodes first register endpoints and then update the HTDB.
   • BFabric WLCs update the HTDB as new clients connect to the wireless network.
   • CFabric APs update the HTDB with the clients' EID and RLOC.
   • DFabric edge nodes update the HTDB based on CAPPWAP messaging from the AP.

   Show answer

   Answer: B

   Explanation

   Reference: https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html

   Source: Adapted from community discussion — Tjemz

   References

   • Cisco documentation

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8. Question 268 · 359 in bank

   What is the purpose of a Cisco SD-Access underlay network?

   • Ato abstract IP-based connectivity from physical connectivity
   • Bto emulate LAN segments to transport Layer 2 frames over a Layer 3 network
   • Cto establish physical connectivity between switches and routers
   • Dto provide virtualization by encapsulating network traffic over IP tunnels

   Show answer

   Answer: C

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9. Question 269 · 359 in bank

   How would Cisco ISE handle authentication for your printer that does not have a supplicant?

   • AISE would not authenticate the printer as printers are not subject to ISE authentication
   • BISE would authenticate the printer using 802.1X authentication
   • CISE would authenticate the printer using MAB
   • DISE would authenticate the printer using web authentication
   • EISE would authenticate the printer using MAC RADIUS authentication

   Show answer

   Answer: C

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10. Question 270 · 359 in bank

    DRAG DROP - Drag and drop the components in a Cisco SD-Access architecture from the left onto their descriptions on the right. Select and Place:

    

    This is an interactive task on the real exam — a drag-and-drop, hotspot or ordering question. There is nothing to select here, so the answer is shown below for reference.

    Show the answer figure

    Answer: See figure below

    Explanation

    Uses VXLAN - Data plane. Defined by the physical switches and routers - Underlay. Contains data plane traffic and control plane traffic - Overlay. Uses LISP - Control plane.

    Source: Adapted from community discussion — bccabrera

    References

    • Cisco documentation
    • Cisco documentation

    

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300-420 practice, question 261. 359 questions available.