300-420 Practice Test

300-420 Practice Test practice questions, page 13 of 17, with answer review and explanations.

Question 61

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?

  1. enabling BFD for EIGRP on the access layer uplinks
  2. reducing the EIGRP Hello / Hold timer values
  3. EIGRP summarization from core to aggregation layer
  4. EIGRP summarization from access to aggregation layer

Question 62

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?

  1. Implement slow timers between peers with low CPU resources.
  2. Implement BFD asynchronous mode between peers with low CPU resources.
  3. Enable BFD multi-hop on the devices with low CPU resources.
  4. Utilize carrier delay on all routers in the network.

Question 63

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

  1. Hellos are sent between the WAN Edge routers and the vSmart controller.
  2. BFD runs on the IPsec tunnels between WAN Edge routers.
  3. BGP is used between WAN Edge routers and the vSmart controller.
  4. Link state change messages are sent between vSmart controllers.

Question 64

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

  1. use multiple equal-cost links
  2. use an IGP
  3. use HSRP
  4. use RPVSTP+
  5. use multiple unequal-cost links

Question 65

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.)

  1. Implement Rapid PVST+ instead of STP.
  2. Implement MST instead of STP.
  3. Use VTP to propagate VLAN information and to prune unused VLANs.
  4. Configure broadcast and multicast storm control on all switches.
  5. Configure dynamic trunking protocol to propagate VLAN information.