CCNA 2 - Chapter 2 version 5.03 Exam Answers

1. Which two network design features require Spanning Tree Protocol (STP) to ensure correct network operation? (Choose two.)

   • static default routes
   • implementing VLANs to contain broadcasts
   • redundant links between Layer 2 switches
   • link-state dynamic routing that provides redundant routes
   • removing single points of failure with multiple Layer 2 switches
     

2. What is a characteristic of a Layer 2 loop?

   • Broadcast frames are forwarded back to the sending switch.
   • The Time-to-Live attribute of a frame is set to infinity.
   • Routers continually forward packets to other routers.
   • A switch is continually forwarding the same unicast frame.
     

3. What is the outcome of a Layer 2 broadcast storm?

   • Routers will take over the forwarding of frames as switches become congested.
   • New traffic is discarded by the switch because it is unable to be processed.
   • CSMA/CD will cause each host to continue transmitting frames.
   • ARP broadcast requests are returned to the transmitting host.
     

4. What additional information is contained in the 12-bit extended system ID of a BPDU?

   • MAC address
   • VLAN ID
   • IP address
   • port ID
     

5. Which three components are combined to form a bridge ID?

   • port ID
   • IP address
   • extended system ID
   • MAC address
   • bridge priority
   • cost
     

6. Which STP priority configuration would ensure that a switch would always be the root switch?

   • spanning-tree vlan 10 priority 0
   • spanning-tree vlan 10 priority 61440
   • spanning-tree vlan 10 root primary
   • spanning-tree vlan 10 priority 4096
     

7. Which protocol provides up to 16 instances of RSTP, combines many VLANs with the same physical and logical topology into a common RSTP instance, and provides support for PortFast, BPDU guard, BPDU filter, root guard, and loop guard?

   • STP
   • Rapid PVST+
   • PVST+
   • MST
     

8. Which two types of spanning tree protocols can cause suboptimal traffic flows because they assume only one spanning-tree instance for the entire bridged network? (Choose two.)

   • STP
   • Rapid PVST+
   • PVST+
   • MSTP
   • RSTP
     

9. What is an advantage of PVST+?

   • PVST+ requires fewer CPU cycles for all the switches in the network.
   • PVST+ reduces bandwidth consumption compared to traditional implementations of STP that use CST.
   • PVST+ optimizes performance on the network through autoselection of the root bridge.
   • PVST+ optimizes performance on the network through load sharing.
     

10. In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)

    • blocking
    • disabled
    • forwarding
    • learning
    • listening
      

11. If no bridge priority is configured in PVST, which criteria is considered when electing the root bridge?

    • lowest IP address
    • lowest MAC address
    • highest IP address
    • highest MAC address
      

12. Which RSTP ports are connected to end devices?

    • trunk ports
    • designated ports
    • root ports
    • edge ports
      

13. A network administrator is preparing the implementation of Rapid PVST+ on a production network. How are the Rapid PVST+ link types determined on the switch interfaces?

    • Link types are determined automatically.
    • Link types must be configured with specific port configuration commands.
    • Link types can only be determined if PortFast has been configured.
    • Link types can only be configured on access ports configured with a single VLAN.
      

14. Which port state will switch ports immediately transition to when configured for PortFast?

    • listening
    • learning
    • forwarding
    • blocking
      

15. To obtain an overview of the spanning tree status of a switched network, a network engineer issues the show spanning-tree command on a switch. Which two items of information will this command display? (Choose two.)

    • The root bridge BID.
    • The role of the ports in all VLANs.
    • The status of native VLAN ports.
    • The number of broadcasts received on each root port.
    • The IP address of the management VLAN interface.
      

16. What is the purpose of HSRP?

    • It provides a continuous network connection when a router fails.
    • It prevents a rogue switch from becoming the STP root.
    • It enables an access port to immediately transition to the forwarding state.
    • It prevents malicious hosts from connecting to trunk ports.
      

17. Which nonproprietary protocol provides router redundancy for a group of routers which support IPv4 LANs?

    • HSRP
    • VRRPv2
    • GLBP
    • SLB
      

18. Refer to the exhibit. Which protocol information is being displayed in the output?

    
    
    • FHRP
    • GLBP
    • HSRP
    • VRRP
      

19. Refer to the exhibit. A network engineer is troubleshooting host connectivity on a LAN that uses a first hop redundancy protocol. Which IPv4 gateway address should be configured on the host?

    
    

    CCNA 3 Chapter 2 Exam Answer 002
    • 192.168.2.0
    • 192.168.2.1
    • 192.168.2.2
    • 192.168.2.100
      

20. Fill in the blank. Do not use abbreviations.
    The spanning-tree       mode rapid-pvst             global configuration command is used to enable Rapid PVST+.

21. Fill in the blank.

    In FHRP operation, two or more routers are represented as a single       virtual             router.

22. Match the step number to the sequence of stages that occur during the HSRP failover process. (Not all options are used.)

    
    

    CCNA 3 Chapter 2 Exam Answer 003

23. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.

    Which switch is the root bridge?​

    • Switch_1
    • Switch_2
    • Switch_3
    • Switch_4