Designing Cisco Enterprise Networks (ENSLD) v1.0 (300-420)

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Total 201 questions

An engineer is designing a Layer 3 campus network running EIGRP between the core, aggregation, and access layers. The access layer switches will be connected to the aggregation layer using Layer 3 copper connections. The engineer wants to improve the convergence time for access layer switch failures.
Which technique must the design include?

  • A. enabling BFD for EIGRP on the access layer uplinks
  • B. reducing the EIGRP Hello / Hold timer values
  • C. EIGRP summarization from core to aggregation layer
  • D. EIGRP summarization from access to aggregation layer


Answer : A

An existing network solution is using BFD in echo mode. Several network devices are experiencing high CPU utilization, which an engineer has determined is related to the BFD feature. Which solution should the engineer leverage to reduce the CPU load?

  • A. Implement slow timers between peers with low CPU resources.
  • B. Implement BFD asynchronous mode between peers with low CPU resources.
  • C. Enable BFD multi-hop on the devices with low CPU resources.
  • D. Utilize carrier delay on all routers in the network.


Answer : A

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

  • A. Hellos are sent between the WAN Edge routers and the vSmart controller.
  • B. BFD runs on the IPsec tunnels between WAN Edge routers.
  • C. BGP is used between WAN Edge routers and the vSmart controller.
  • D. Link state change messages are sent between vSmart controllers.


Answer : B


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
  • B. use an IGP
  • C. use HSRP
  • D. use RPVSTP+
  • E. use multiple unequal-cost links


Answer : AB

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:
ג€¢ reduce the impact of topology changes
ג€¢ reduce the time spent on network administration
ג€¢ reduce manual configuration errors
Which two solutions should the architect include in the new design? (Choose two.)

  • A. Implement Rapid PVST+ instead of STP.
  • B. Implement MST instead of STP.
  • C. Use VTP to propagate VLAN information and to prune unused VLANs.
  • D. Configure broadcast and multicast storm control on all switches.
  • E. Configure dynamic trunking protocol to propagate VLAN information.


Answer : CD

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

  • A. border node
  • B. spine node
  • C. leaf node
  • D. Cisco DNA Center


Answer : D

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

  • A. Border nodes first register endpoints and then update the HTDB.
  • B. Fabric WLCs update the HTDB as new clients connect to the wireless network.
  • C. Fabric APs update the HTDB with the clientsג€™ EID and RLOC.
  • D. Fabric edge nodes update the HTDB based on CAPPWAP messaging from the AP.


Answer : B

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

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

  • A. to abstract IP-based connectivity from physical connectivity
  • B. to emulate LAN segments to transport Layer 2 frames over a Layer 3 network
  • C. to establish physical connectivity between switches and routers
  • D. to provide virtualization by encapsulating network traffic over IP tunnels


Answer : C

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:




Answer :


Refer to the exhibit. The distribution switches serve as the Layer 3 boundary. HSRP preemption is enabled. When the primary switch comes back after a failure, traffic is initially dropped. Which solution must be implemented to improve the design?

  • A. Increase the hello timers on both HSRP devices.
  • B. Use the preempt delay feature on the backup HSRP device.
  • C. Use the preempt delay feature on the primary HSRP device.
  • D. Configure a higher mac-refresh interval on both HSRP devices.


Answer : C


Refer to the exhibit. Where must an architect plan for route summarization for the topology?

  • A. from the core toward the aggregation and the access toward the aggregation
  • B. from the core toward the aggregation and the aggregation toward the core
  • C. from the aggregation toward the access and the access toward the aggregation
  • D. from the aggregation toward the core and the aggregation toward the access


Answer : D


Refer to the exhibit. The connection between SW2 and SW3 is fiber and occasionally experiences unidirectional link failure. An architect must optimize the network to reduce the change of Layer 2 forwarding loops when the link fails. Which solution should the architect include?

  • A. Utilize BPDU filter on SW3.
  • B. Utilize root guard on SW1.
  • C. Utilize BPDU guard on SW1.
  • D. Utilize loop guard on SW2.


Answer : D


Refer to the exhibit. The full EIGRP routing table is advertised throughout the network. Currently, users experience data loss when any one link in the network fails. An architect must optimize the network to reduce the impact when a link fails. Which solution should the architect include in the design?

  • A. Run BFD on the inter links between EIGRP neighbors.
  • B. Summarize the access layer networks from each access layer switch toward the aggregation layer.
  • C. Reduce the default EIGRP hello interval and hold time.
  • D. Summarize the access layer networks from the aggregation layer toward the core layer.


Answer : A

What is the purpose of a control plane node in a Cisco SD-Access network fabric?

  • A. to maintain the endpoint database and mapping between endpoints and edge nodes
  • B. to detect endpoints in the fabric and inform the host tracking database of EID-to-fabric-edge node bindings
  • C. to identify and authenticate endpoints within the network fabric
  • D. to act as the network gateway between the network fabric and outside networks


Answer : B


Refer to the exhibit. An architect reviews the low-level design of a companyג€™s enterprise network and advises optimizing the STP convergence time. Which functionality must be applied to Gi1/0/1-10 to follow the architect's recommendation?

  • A. UplinkFast
  • B. root guard
  • C. BPDU guard
  • D. PortFast


Answer : D

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Total 201 questions