Question 1.
If a bridge or switch port has been placed in the blocking state, the port:

a) will be able to send and receive end-system data frames and configuration BPDUs.
b) will be able to send and receive end-system data frames only.
c) will be able to send configuration BPDUs only.
d) will be able to send and receive configuration BPDUs only.
e) will be unable to send or receive end-system data frames and configuration BPDUs.

Answer

Question 2.
The Forward Delay field in a configuration BPDU specifies the amount of time:

a) that a frame should be held in a port's buffer when using store-and-forward switching.
b) that a frame should be held in a port's buffer before beginning to forward the frame when using FragmentFree switching.
c) that a bridge should stay in the spanning tree listening and learning port states.
d) that a bridge should stay in the spanning tree blocking, listening, and learning port states.
e) to wait between sending configuration BPDU frames.

Answer

Question 3.
If a port has been identified as a non-designated port by the Spanning Tree Protocol, it will be placed in the ____________ state when the network has converged.

a) listening
b) blocking
c) disabled
d) learning
e) forwarding

Answer

Answers

Question 1.
If a bridge or switch port has been placed in the blocking state, the port:

a) will be able to send and receive end-system data frames and configuration BPDUs.
b) will be able to send and receive end-system data frames only.
c) will be able to send configuration BPDUs only.
d) will be able to send and receive configuration BPDUs only.
e) will be unable to send or receive end-system data frames and configuration BPDUs.

Answer
d) will be able to send and receive configuration BPDUs only.

Explanation
Using the Spanning Tree Protocol, a port that has been placed in the blocking state continues to send and receive only configuration BPDUs. The receipt of expected BPDU frames on a port indicates that the topology of the network has not changed.

If a blocking or a forwarding port does not receive BPDUs expected from its neighbor within a given time period, or if BPDUs containing a new Bridge ID are received, the port assumes that a change in the topology of the network has occurred. It then initiates the process of calculating a new spanning tree.
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Question 2.
The Forward Delay field in a configuration BPDU specifies the amount of time:

a) that a frame should be held in a port's buffer when using store-and-forward switching.
b) that a frame should be held in a port's buffer before beginning to forward the frame when using FragmentFree switching.
c) that a bridge should stay in the spanning tree listening and learning port states.
d) that a bridge should stay in the spanning tree blocking, listening, and learning port states.
e) to wait between sending configuration BPDU frames.

Answer
c) that a bridge should stay in the spanning tree listening and learning port states.

Explanation
The Forward Delay field within a configuration BPDU frame identifies the amount of time that a bridge should remain in the "learning" and "listening" states before being permitted to transition to the next port state.

The Forward Delay parameter is intended to provide a sufficient amount of time for the Spanning Tree Algorithm to propagate topology information throughout the network.
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Question 3.
If a port has been identified as a non-designated port by the Spanning Tree Protocol, it will be placed in the ____________ state when the network has converged.

a) listening
b) blocking
c) disabled
d) learning
e) forwarding

Answer
b) blocking

Explanation
A port that has been identified as a non-designated port by the Spanning Tree Protocol will be placed in the blocking state when the network has converged. Non-designated ports are not permitted to forward data frames, effectively breaking topology loops in the network.
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