- A
Reduce the STP forward delay timer globally on the switch.
Why wrong: Lowering the forward delay timer reduces the listening and learning durations for all ports, but it affects the entire switched network and can increase the risk of temporary loops if a topology change occurs. It is not a targeted fix for an edge port and introduces unnecessary instability.
- B
Enable PortFast on the access port.
PortFast is designed for ports that connect to end hosts. It forces the port to transition directly to the forwarding state, skipping the normal STP listening and learning phases, which is exactly what is needed to eliminate the 30-second boot-time delay.
- C
Disable STP on the access VLAN assigned to the port.
Why wrong: Disabling STP on a VLAN removes loop prevention entirely, which could cause severe broadcast storms if a loop inadvertently occurs (e.g., a user connects a small switch). This is a dangerous and unsupported approach to solving a delay problem.
- D
Enable Rapid PVST+ on the switch.
Why wrong: Upgrading to Rapid PVST+ improves overall convergence speed but does not automatically make an access port skip the learning/listening phases. An edge port still requires the explicit 'spanning-tree portfast' or 'spanning-tree port type edge' command to become a PortFast-enabled port. Without that, the port experience a similar delay.
CCNA Switching and Network Access Practice Question
This 200-301 practice question tests your understanding of switching and network access. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Users report that their PCs take over 30 seconds to obtain IP addresses and reach the network after being powered on. A network technician checks a switch port connected to a PC and observes that the port transitions through blocking, listening, learning, and then forwarding states, taking about 30 seconds to complete. The switch is running standard 802.1D STP. The technician confirms the port is an access port and only connects to a PC. What should the technician do next?
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
Enable PortFast on the access port.
The correct next action is to enable PortFast on the access port. PortFast allows a port to immediately transition to the forwarding state, bypassing the listening and learning phases, which is safe because the port connects only to an end device and cannot create a bridging loop. This directly resolves the 30-second boot-time delay without making network-wide changes.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Reduce the STP forward delay timer globally on the switch.
Why it's wrong here
Lowering the forward delay timer reduces the listening and learning durations for all ports, but it affects the entire switched network and can increase the risk of temporary loops if a topology change occurs. It is not a targeted fix for an edge port and introduces unnecessary instability.
- ✓
Enable PortFast on the access port.
Why this is correct
PortFast is designed for ports that connect to end hosts. It forces the port to transition directly to the forwarding state, skipping the normal STP listening and learning phases, which is exactly what is needed to eliminate the 30-second boot-time delay.
Related concept
Access ports place end devices into a single VLAN.
- ✗
Disable STP on the access VLAN assigned to the port.
- ✗
Enable Rapid PVST+ on the switch.
Why it's wrong here
Upgrading to Rapid PVST+ improves overall convergence speed but does not automatically make an access port skip the learning/listening phases. An edge port still requires the explicit 'spanning-tree portfast' or 'spanning-tree port type edge' command to become a PortFast-enabled port. Without that, the port experience a similar delay.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓Enable PortFast on the access port.Correct answer▾
Why this is correct
PortFast is designed for ports that connect to end hosts. It forces the port to transition directly to the forwarding state, skipping the normal STP listening and learning phases, which is exactly what is needed to eliminate the 30-second boot-time delay.
✗Reduce the STP forward delay timer globally on the switch.Wrong answer — click to see why▾
Why this is wrong here
This action is too drastic and impacts all ports, whereas the issue is specific to access ports connected to end devices. PortFast is the standard, safe method for eliminating delay on edge ports.
✗Disable STP on the access VLAN assigned to the port.Wrong answer — click to see why▾
Why this is wrong here
Candidates might think that turning off STP on a single VLAN is a quick fix, but it removes the safety net against loops and is not a recommended network practice. PortFast provides the immediate-forwarding benefit while preserving STP loop protection.
✗Enable Rapid PVST+ on the switch.Wrong answer — click to see why▾
Why this is wrong here
Candidates often assume that Rapid PVST+ immediately forwards on all access ports, but the edge port behavior must be configured. The scenario explicitly mentions the port is an access port connected only to a PC; the immediate fix is to enable PortFast, not change the entire STP mode.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Trap categories for this question
Similar concept trap
Upgrading to Rapid PVST+ improves overall convergence speed but does not automatically make an access port skip the learning/listening phases. An edge port still requires the explicit 'spanning-tree portfast' or 'spanning-tree port type edge' command to become a PortFast-enabled port. Without that, the port experience a similar delay.
Command / output trap
Upgrading to Rapid PVST+ improves overall convergence speed but does not automatically make an access port skip the learning/listening phases. An edge port still requires the explicit 'spanning-tree portfast' or 'spanning-tree port type edge' command to become a PortFast-enabled port. Without that, the port experience a similar delay.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 200-301 questions on switching, trunking, and access-port configuration.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Switching and Network Access — This question tests Switching and Network Access — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Enable PortFast on the access port. — The correct next action is to enable PortFast on the access port. PortFast allows a port to immediately transition to the forwarding state, bypassing the listening and learning phases, which is safe because the port connects only to an end device and cannot create a bridging loop. This directly resolves the 30-second boot-time delay without making network-wide changes.
What should I do if I get this 200-301 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 200-301 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 14, 2026
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