easyMultiple ChoiceObjective-mapped
200-901 Practice Question: Refer to the exhibit
Exhibit
Refer to the exhibit. ``` interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 spanning-tree portfast ```
Refer to the exhibit. A PC is connected to interface GigabitEthernet0/1 on a Cisco switch. The PC is in VLAN 10. What is the purpose of the 'spanning-tree portfast' command on this interface?
⚠ Common exam trap
Cisco often tests the misconception that PortFast disables STP entirely, but the trap here is that PortFast only speeds up the initial transition to forwarding while STP remains active and the port can still react to BPDUs.
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
✓
It allows the interface to transition directly to forwarding state.
The 'spanning-tree portfast' command on a switch interface connected to an end host (like a PC) allows that port to bypass the listening and learning states and transition directly to the forwarding state. This is correct because PortFast is designed for access ports that connect to end devices, which do not participate in spanning tree, thereby eliminating the 30-second delay (15 seconds for listening, 15 seconds for learning) and providing immediate connectivity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It disables STP on the interface.
Why it's wrong here
STP still runs but portfast bypasses listening/learning.
- ✗
It prevents the interface from entering blocking state.
Why it's wrong here
PortFast allows immediate forwarding, but blocking is still possible if BPDUs are received.
- ✓
It allows the interface to transition directly to forwarding state.
Why this is correct
PortFast eliminates the learning/listening delays.
- ✗
It enables BPDU guard on the interface.
Why it's wrong here
BPDU guard is a separate configuration.
- ✗
It enables Rapid Spanning Tree on the interface.
Why it's wrong here
PortFast does not enable RSTP; it is a feature for access ports.
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Senior Network & Security Engineer · founder of Courseiva
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