Cisco CCNP Enterprise 300-420 Questions & Answers

• Question 121:

  Refer to the exhibit.

  

  A customer needs to apply QoS to the network management traffic passing through the GigabitEthernet0/2 interface. All eight queuing classes are in use, so the new requirement must be integrated into the existing policy. Which solution must the customer choose?

  A. Mark traffic to DSCP CS5 and assign it to the SIGNALLING class. Then, baseline existing queue sizes to determine if additional bandwidth can be provisioned to the SIGNALLING class.

  B. Mark the traffic to DSCP CS4 and assign it to the SIGNALLING class. Then, prioritize traffic within the class.

  C. Mark the traffic to DSCP CS6 and assign it to the ROUTING class Then, prioritize traffic within the class.

  D. Mark the traffic to DSCP CS2 and assign it to the ROUTING class Then, baseline existing queue sizes to determine if additional bandwidth can be provisioned to the ROUTING class

  Correct Answer: D

• Question 122:

  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?

  

  x

  A. split-horizon

  B. summarization

  C. down bit

  D. route tags

  Correct Answer: D

• Question 123:

  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 primary HSRP device.

  C. Use the preempt delay feature on the backup HSRP device

  D. Configure a higher mac-refresh interval on both HSRP devices

  Correct Answer: B

• Question 124:

  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 layer2 forwarding loops when the link fails. Which solution should the architect include?

  

  A. Utilize 8PDU filter on SW3.

  B. Utilize loop guard on SW2

  C. Utilize BPDU guard on SW1

  D. Utilize root guard on SW1.

  Correct Answer: B

• Question 125:

  An architect must address sustained congestion on the access and distribution uplink of network. QoS has already been implemented and optimized, but it is no longer effective in ensuring optimal network performance. Which two solutions should the architect use to improver network performance? (Choose two)

  A. Reconfigure QoS based on the IntServ model

  B. Utilize random early detection to manage queues

  C. Implement higher-speed uplink interfaces

  D. Bundle additional uplinks into logical EtherChannels

  E. Configure selective packet discard to drop noncritical network traffic.

  Correct Answer: CD

• Question 126:

  How is 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.

  Correct Answer: B

• Question 127:

  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?

  A. utilize NAT64 to translate the addresses

  B. Implement NAT44 at the edge of the customer network

  C. use 6to4 and a tunnel to translate the addresses

  D. implement 6PE to resolve hostname resolution

  Correct Answer: A

• Question 128:

  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.)

  

  A. Implement Enhanced Object Tracking on roster R1

  B. use a floating static route

  C. Implement IP SLA on router R1

  D. Implement PBR on router R1

  E. use IP source routing

  Correct Answer: AC

• Question 129:

  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:

  1.

  reduce the impact of topology changes

  2.

  reduce the time spent on network administration

  3.

  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.

  Correct Answer: AC

• Question 130:

  An engineer is designing an EIGRP network for a small branch site where there is only one Layer 3 router. The engineer wants the router to advertise the local LAN network to remote EIGRP neighbors without sending any unnecessary multicast messages on the local LAN. Which action should the engineer take?

  A. Use a static default route for this site instead of EIGRP

  B. Advertise the local LAN using the network command and the passive-interface feature

  C. Redistribute the local LAN network using the redistribute connected command

  D. Advertise the local LAN subnet as a stub network

  Correct Answer: B