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Switching and Network Access →hardConfigurationObjective-mapped

CCNA Switching and Network Access Practice Question

This 200-301 practice question tests your understanding of switching and network access. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.

Network Topology
Fa0/5Fa0/10SW2IP PhoneAccess Point

You are connected to the console of a Catalyst 2960+ switch named SW2. Configure the switch so that the IP phone connected to interface FastEthernet0/5 receives power via PoE and uses VLAN 150 for voice traffic, while the PC connected through the phone uses VLAN 50 for data. Additionally, the access point connected to interface FastEthernet0/10 must receive PoE and be placed in VLAN 100. Assume the interfaces are already correctly configured as access ports in VLAN 50 and VLAN 100, respectively. Verify your configuration using the appropriate show commands.

Question 1hardConfiguration
Open the full VLAN trunking answer →

Exhibit

SW2#show running-config | section interface FastEthernet0/[5,10]
interface FastEthernet0/5
 switchport mode access
 switchport access vlan 50
!
interface FastEthernet0/10
 switchport mode access
 switchport access vlan 100
!

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

✓

On interface FastEthernet0/5: switchport voice vlan 150, power inline auto. On interface FastEthernet0/10: power inline auto. Verify with show interfaces switchport and show power inline.

The switch had no voice VLAN or PoE configured on the ports. On FastEthernet0/5, you need to add 'switchport voice vlan 150' to separate voice traffic from data, and 'power inline auto' to enable PoE for the IP phone. On FastEthernet0/10, you only need to enable PoE with 'power inline auto' because the AP already has its access VLAN set. After configuration, 'show interfaces switchport' will confirm the voice VLAN, and 'show power inline' will verify PoE status.

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.

  • ✓

    On interface FastEthernet0/5: switchport voice vlan 150, power inline auto. On interface FastEthernet0/10: power inline auto. Verify with show interfaces switchport and show power inline.

    Why this is correct

    This is correct because the voice VLAN command separates voice traffic onto VLAN 150, and power inline auto enables PoE on both ports. The show commands confirm the configuration.

    Related concept

    Access ports place end devices into a single VLAN.

  • ✗

    On interface FastEthernet0/5: switchport voice vlan 150, power inline auto. On interface FastEthernet0/10: switchport access vlan 100, power inline auto. Verify with show interfaces switchport and show power inline.

    Why it's wrong here

    This is incorrect because the access point on FastEthernet0/10 is already in VLAN 100 by default or previous configuration; the question does not require changing the access VLAN. Adding switchport access vlan 100 is unnecessary and may cause issues if the port was already configured differently.

  • ✗

    On interface FastEthernet0/5: switchport voice vlan 150, power inline auto. On interface FastEthernet0/10: power inline auto. Verify with show vlan and show power inline.

    Why it's wrong here

    This is incorrect because show vlan does not display voice VLAN configuration on a specific interface; it shows VLAN membership globally. The correct verification command for voice VLAN is show interfaces switchport.

  • ✗

    On interface FastEthernet0/5: switchport voice vlan 150, power inline auto. On interface FastEthernet0/10: power inline auto. Verify with show interfaces trunk and show power inline.

    Why it's wrong here

    This is incorrect because show interfaces trunk displays trunking information, not voice VLAN configuration. The correct command is show interfaces switchport.

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.

✓On interface FastEthernet0/5: switchport voice vlan 150, power inline auto. On interface FastEthernet0/10: power inline auto. Verify with show interfaces switchport and show power inline.Correct answer▾

Why this is correct

This is correct because the voice VLAN command separates voice traffic onto VLAN 150, and power inline auto enables PoE on both ports. The show commands confirm the configuration.

✗On interface FastEthernet0/5: switchport voice vlan 150, power inline auto. On interface FastEthernet0/10: switchport access vlan 100, power inline auto. Verify with show interfaces switchport and show power inline.Wrong answer — click to see why▾

Why this is wrong here

The error is adding an unnecessary access VLAN command for the AP port, which is not required and could conflict with existing configuration.

Why candidates choose this

Candidates might think they need to explicitly set the access VLAN for the AP, but the question only asks to place it in VLAN 100, which is already the default or preconfigured VLAN.

✗On interface FastEthernet0/5: switchport voice vlan 150, power inline auto. On interface FastEthernet0/10: power inline auto. Verify with show vlan and show power inline.Wrong answer — click to see why▾

Why this is wrong here

The error is using show vlan instead of show interfaces switchport to verify voice VLAN on a port.

Why candidates choose this

Candidates may confuse show vlan with show interfaces switchport, thinking show vlan provides per-interface voice VLAN details.

✗On interface FastEthernet0/5: switchport voice vlan 150, power inline auto. On interface FastEthernet0/10: power inline auto. Verify with show interfaces trunk and show power inline.Wrong answer — click to see why▾

Why this is wrong here

The error is using show interfaces trunk, which is for trunk ports, not for verifying voice VLAN on an access port.

Why candidates choose this

Candidates might think show interfaces trunk shows all VLAN information, but it only shows allowed VLANs on trunk links, not voice VLAN on access ports.

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

  • Command / output trap

    This is incorrect because show vlan does not display voice VLAN configuration on a specific interface; it shows VLAN membership globally. The correct verification command for voice VLAN is show interfaces switchport.

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: On interface FastEthernet0/5: switchport voice vlan 150, power inline auto. On interface FastEthernet0/10: power inline auto. Verify with show interfaces switchport and show power inline. — The switch had no voice VLAN or PoE configured on the ports. On FastEthernet0/5, you need to add 'switchport voice vlan 150' to separate voice traffic from data, and 'power inline auto' to enable PoE for the IP phone. On FastEthernet0/10, you only need to enable PoE with 'power inline auto' because the AP already has its access VLAN set. After configuration, 'show interfaces switchport' will confirm the voice VLAN, and 'show power inline' will verify PoE status.

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 6, 2026

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