CCNA3 v6.0 Chapter 3 Exam – Online Assessment

1. Question

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. Question

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.

3. Question

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

prevents Layer 2 loops
prevents routing loops on a router
creates smaller collision domains
creates smaller broadcast domains
allows Cisco devices to exchange routing table updates

4. Question

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.

5. Question

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

MAC address
VLAN ID
IP address
port ID

6. Question

Which three components are combined to form a bridge ID?

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

7. Question

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

CCNA3 v6.0 Chapter 3 Exam 03

SW1 will become the root bridge.
SW2 will become the root bridge.
SW2 will get a port blocked.
SW4 will get a port blocked.
SW3 will become the root bridge.
SW4 will become the root bridge.

8. Question

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

CCNA3 v6.0 Chapter 3 Exam 01

Trunk1
Trunk2
Trunk3
Trunk4

9. Question

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

10. Question

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?

BPDU guard
extended system ID
PortFast
PVST+

11. Question

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

12. Question

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

Rapid PVST
802.1D
MST
PVST+

13. Question

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.

14. Question

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

15. Question

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

16. Question

Which RSTP ports are connected to end devices?

trunk ports
designated ports
root ports
edge ports

17. Question

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.

18. Question

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

listening
learning
forwarding
blocking

19. Question

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

20. Question

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

CCNA3 v6.0 Chapter 3 Exam 02

designated switch
edge switch
root bridge
enabled bridge
local bridge

21. Question

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.

22. Question

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

StackWise
root
designated
edge

23. Question

Match the spanning-tree feature with the protocol type. (Not all options are used.)

Sort elements

PVST+
RSTP
MSTP
MST
Rapid PVST+

Cisco implementation of IEEE 802.1D
Fast converging enhancement of IEEE 802.1D
IEEE standard that reduces the number of STP instances
Proprietary per VLAN implementation of IEEE 802.1w

24. Question

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

25. Question

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