CCNA 3 Scaling Networks Ver 6.0 – ITN Chapter 3 Exam Answers

CCNA 3 Chapter 3 Exam Answers

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

    (Choose two.)

    redundant links between Layer 2 switches*

    link-state dynamic routing that provides redundant routes

    implementing VLANs to contain broadcasts

    static default routes

    removing single points of failure with multiple Layer 2 switches*

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

    spanning-tree vlan 10 root primary

    spanning-tree vlan 10 priority 0*

    spanning-tree vlan 10 priority 4096

    spanning-tree vlan 10 priority 61440

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

    MAC address

    port ID

    VLAN ID*

    IP address

  4. Refer to the exhibit. Which trunk link will not forward any traffic after the root bridge election process is complete?





  5. 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?




    Rapid PVST+

  6. Fill in the blank. Do not use abbreviations.

    The spanning-tree _______ global configuration command is used to enable Rapid PVST+.

    Correct Answer: mode rapid-pvst

  7. What port type is used to interconnect switches in a switch stack?





  8. Which spanning tree standard supports only one root bridge so that traffic from all VLANs flows over the same path?



    Rapid PVST


  9. 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.)





    Rapid PVST+

  10. What is the purpose of the Spanning Tree Protocol (STP)?

    prevents Layer 2 loops*

    prevents routing loops on a router

    creates smaller broadcast domains

    allows Cisco devices to exchange routing table updates

    creates smaller collision domains

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





  12. Refer to the exhibit. Which switch will be elected the root bridge and which switch will place a port in blocking mode?

    (Choose two.)

    SW1 will become the root bridge.

    SW2 will get a port blocked.

    SW4 will become the root bridge.

    SW2 will become the root bridge.

    SW3 will become the root bridge.*

    SW4 will get a port blocked.*

  13. What is an advantage of PVST+?

    PVST+ optimizes performance on the network through autoselection of the root bridge.

    PVST+ reduces bandwidth consumption compared to traditional implementations of STP that use CST.

    PVST+ requires fewer CPU cycles for all the switches in the network.

    PVST+ optimizes performance on the network through load sharing.*

  14. 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 role of the ports in all VLANs.*

    The root bridge BID.*

    The number of broadcasts received on each root port.

    The IP address of the management VLAN interface.

    The status of native VLAN ports.

  15. 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 can only be determined if PortFast has been configured.

    Link types are determined automatically.*

    Link types must be configured with specific port configuration commands.

    Link types can only be configured on access ports configured with a single VLAN.

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

    highest MAC address

    lowest MAC address*

    lowest IP address

    highest IP address

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

    ARP broadcast requests are returned to the transmitting host.

    CSMA/CD will cause each host to continue transmitting frames.

    New traffic is discarded by the switch because it is unable to be processed.*

    Routers will take over the forwarding of frames as switches become congested.

  18. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question. Which switch is the root bridge?





  19. In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network?

    (Choose two.)






  20. Which Cisco switch feature ensures that configured switch edge ports do not cause Layer 2 loops if a port is mistakenly connected to another switch?


    extended system ID

    BPDU guard*


  21. 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.

  22. Refer to the exhibit. What is the role of the SW3 switch?

    designated switch

    root bridge*

    enabled bridge

    local bridge

    edge switch

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

    MAC address*

    extended system ID*

    IP address


    bridge priority*

    port ID

  24. Which RSTP ports are connected to end devices?

    edge ports*

    designated ports

    trunk ports

    root ports

  25. Question as presented:

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