STP Troubleshooting STP 3

Question 1

What is Unidirectional Link Detection (UDLD)?

Accepted Answer

A protocol that detects one-way communication failures on fiber links that could cause STP loops

Answer

A speed test tool

Answer

A cable length measurement

Answer

A VLAN verification protocol

Question 2

What is the impact of incorrect STP timer modifications?

Accepted Answer

Can cause network instability, premature convergence failures, or delayed failover

Answer

No impact on network operation

Answer

Only affects logging

Answer

Only affects management traffic

Question 3

How does STP handle a switch receiving superior BPDUs on its root port?

Accepted Answer

The switch updates its root bridge information and recalculates the spanning tree topology

Answer

Ignores the BPDUs

Answer

Shuts down the port

Answer

Sends an error message

Question 4

What is the purpose of STP path cost manipulation?

Accepted Answer

To influence which paths STP selects as primary forwarding paths by adjusting port costs

Answer

To change the physical cable routing

Answer

To modify transmission speed

Answer

To reduce power consumption

Question 5

What happens when PortFast is incorrectly enabled on a switch-to-switch link?

Accepted Answer

It can cause temporary bridging loops because the port skips listening and learning states

Answer

Nothing happens

Answer

The port operates more reliably

Answer

The link becomes faster

Question 6

How do you verify STP is functioning correctly on a network?

Accepted Answer

Check that one root bridge exists per VLAN, all ports are in expected states, and no topology changes are occurring unexpectedly

Answer

Only check if devices can ping each other

Answer

Look at the cable connections

Answer

Check the power supplies