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350-401 Practice Question: Interface GigabitEthernet0/1 spanning-tree…
interface GigabitEthernet0/1 spanning-tree portfast spanning-tree bpduguard enable
end
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the misconception that BPDUguard ignores BPDUs or that PortFast still goes through STP states, but the key trap is that BPDUguard error-disables the port upon BPDU reception, not just ignores or blocks it.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The port will immediately transition to forwarding state and will be error-disabled if a BPDU is received.
The `spanning-tree portfast` command causes the port to immediately transition to the forwarding state, bypassing the listening and learning states. The `spanning-tree bpduguard enable` command places the port in an error-disabled state if any BPDU is received, as BPDU reception on a PortFast-enabled port indicates an unauthorized switch connection, which could cause a bridging loop.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The port will immediately transition to forwarding state and will be error-disabled if a BPDU is received.
Why this is correct
PortFast causes immediate forwarding; BPDU Guard error-disables the port upon BPDU reception.
- ✗
The port will go through normal STP states and will be error-disabled if a BPDU is received.
Why it's wrong here
PortFast skips listening/learning; BPDU Guard still triggers error-disable.
- ✗
The port will immediately transition to forwarding and ignore any BPDUs received.
Why it's wrong here
BPDU Guard does not ignore BPDUs; it error-disables the port.
- ✗
The port will remain in blocking state until a BPDU is received.
Why it's wrong here
PortFast forces immediate forwarding; blocking is not used.
Visual reference
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Last reviewed: Jul 4, 2026
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