Free Practice Quiz Question List

3 Spanning Tree Online Quiz Questions

Use this free practice quiz with 20 questions to review 3 Spanning Tree, test your knowledge, and prepare for your next test or exam.

20 questions

Choose one

1 point

Two switches in the same STP instance have equal priorities. Switch A has MAC address 00:00:00:00:00:20, and Switch B has MAC address 00:00:00:00:00:10. Which switch becomes the root bridge?

A
Switch A, because its MAC address is higher.
B
Switch B, because its MAC address is lower.
C
Switch A, because its MAC address is lower.
D
Switch B, because its MAC address is higher.

Choose one

1 point

A switch has two paths to the root bridge. One uses two links with a total STP path cost of 30; the other uses four links with a total cost of 20. Which path does STP prefer, assuming no other tie-breaks are needed?

A
The two-link path, because fewer links are always preferred.
B
The four-link path, because more links provide more redundancy.
C
The four-link path, because its total cost is lower.
D
Neither path; STP always chooses the path with the highest cost.

Choose one

1 point

An access port intended for an end device has PortFast and BPDU Guard enabled. A switch is unexpectedly connected and sends a BPDU. Which protection behavior should you expect?

A
Root Guard; it places the port in a root-inconsistent state.
B
BPDU Guard; it disables the port.
C
Loop Guard; it places the port in a loop-inconsistent state.
D
PortFast; it disables STP on the port.

Choose all

1 point

Select all correct statements about STP port states.

A
Traditional Learning learns MAC addresses but does not forward user frames.
B
Traditional Listening learns MAC addresses before forwarding begins.
C
RSTP Discarding combines the nonforwarding behavior of traditional Disabled, Blocking, and Listening.
D
Traditional Blocking forwards user frames while processing BPDUs.

Choose all

1 point

A redundant link is not forwarding as expected. Select all appropriate checks to perform before making a change.

A
Compare Root ID and Bridge ID on relevant switches.
B
Inspect the link's role, state, VLAN membership, and physical status.
C
Force the port into forwarding because the current state is inconvenient.
D
Check BPDU reception and whether a protection feature placed the port in an inconsistent or err-disabled state.

True or false

1 point

True or false: Enabling PortFast on a host-facing port disables STP on that port.

A
True
B
False

True or false

1 point

True or false: Root Guard can prevent a downstream switch from taking over as root by placing the port in a root-inconsistent state when superior BPDUs arrive.

A
True
B
False

Written response

1 point

On a non-root switch, what is the role of the single port that provides its best path toward the root bridge?

Written response

1 point

What is the full plural name of the protocol data units switches exchange to share STP information?

Fill in the blank

1 point

For a segment, the STP port selected to provide its active connection into the tree is the . A standby path toward the root that normally does not forward is an .

Fill in the blank

1 point

When superior BPDUs arrive on a protected port, Root Guard places it in the state. When expected BPDUs stop arriving, Loop Guard holds the affected port in the state.

Open ended

1 point

A switch has selected an unexpected root port, and the redundant path is not forwarding. Describe a safe troubleshooting sequence to identify the cause and verify a correction. Include checks of the STP instance, root, path selection, link condition, and any relevant protections.

Choose one

1 point

A network uses PVST+, and the engineer wants VLAN 10 and VLAN 20 to use different spanning-tree topologies. Which statement describes what the protocol permits?

A
All VLANs must use a single shared spanning-tree instance and identical topology.
B
Each VLAN has its own root port on the root bridge.
C
Different VLANs can have separate spanning-tree instances and different topologies.
D
Per-VLAN STP disables redundant links permanently.

True or false

1 point

True or false: A path with fewer physical links is not necessarily preferred by STP if its total path cost is higher.

A
True
B
False

Choose one

1 point

When a port protected by Root Guard receives superior BPDUs, what happens to the port?

A
The port enters a root-inconsistent state.
B
The port enters an err-disabled state.
C
The port enters a loop-inconsistent state.
D
The port immediately becomes a root port.

Choose one

1 point

Which set lists the port states used by Rapid STP (RSTP)?

A
Blocking, listening, learning, forwarding, and disabled
B
Listening, learning, forwarding, and err-disabled
C
Discarding, learning, and forwarding
D
Alternate, designated, and root

Written response

1 point

What RSTP state combines the nonforwarding behavior of the traditional disabled, blocking, and listening states?

Choose one

1 point

Two switches are in the same STP instance. Switch A has a priority of 4096 and Switch B has a priority of 8192. Assuming these are their configured priorities and other Bridge ID components do not change the comparison, which switch wins the root bridge election?

A
Switch A, because its priority is lower.
B
Switch B, because its priority is higher.
C
They share the root role because their priorities differ.
D
The switch with the higher MAC address becomes root.

Choose one

1 point

If candidate paths toward the root have equal total STP path cost, what can STP use to break the tie?

A
It always chooses the path with fewer physical links.
B
It always chooses the path with the higher total cost.
C
It uses further comparisons, including bridge IDs and port IDs.
D
It activates both paths to the root for ordinary traffic.

Written response

1 point

When expected BPDUs stop arriving on a blocked or alternate port protected by Loop Guard, what state is the port held in?

3 Spanning Tree Online Quiz Questions

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