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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
G0/1G0/2SW1IP PhoneAccess Point

You are connected to a multilayer switch SW1 via console. SW1 has an IP phone and an access point connected to interfaces GigabitEthernet0/1 and GigabitEthernet0/2 respectively. Configure the access ports so that the IP phone receives a voice VLAN (VLAN 110) and PoE priority critical, and the access point receives PoE priority high. Verify your configuration using show interfaces switchport and show power inline.

Question 1hardConfiguration
Open the full VLAN trunking answer →

Exhibit

SW1#show running-config | section interface
interface GigabitEthernet0/1
 switchport mode access
 switchport access vlan 10
 spanning-tree portfast
!
interface GigabitEthernet0/2
 switchport mode access
 switchport access vlan 20
 spanning-tree portfast
!

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

✓

interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 switchport voice vlan 110 power inline priority critical ! interface GigabitEthernet0/2 switchport mode access power inline priority high

The IP phone requires a voice VLAN configured with the switchport voice vlan command. PoE priority is set per interface using power inline priority. For the phone, the priority is critical; for the AP, it is high. Verification with show interfaces switchport confirms voice VLAN, and show power inline shows priority settings.

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.

  • ✓

    interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 switchport voice vlan 110 power inline priority critical ! interface GigabitEthernet0/2 switchport mode access power inline priority high

    Why this is correct

    This configuration correctly sets the IP phone port (Gi0/1) with voice VLAN 110 and PoE priority critical, and the AP port (Gi0/2) with PoE priority high. The switchport voice vlan command is used to assign the voice VLAN, and power inline priority sets the PoE priority. The access VLAN (vlan 10) is also configured for the phone's data traffic.

    Related concept

    Access ports place end devices into a single VLAN.

  • ✗

    interface GigabitEthernet0/1 switchport mode trunk switchport trunk allowed vlan 10,110 power inline priority critical ! interface GigabitEthernet0/2 switchport mode access power inline priority high

    Why it's wrong here

    This is incorrect because the IP phone port is configured as a trunk, which is not necessary for a single IP phone. The phone uses the voice VLAN feature on an access port, not a trunk. Additionally, the voice VLAN should be configured with the switchport voice vlan command, not by trunking.

  • ✗

    interface GigabitEthernet0/1 switchport mode access switchport access vlan 110 switchport voice vlan 10 power inline priority critical ! interface GigabitEthernet0/2 switchport mode access power inline priority high

    Why it's wrong here

    This is incorrect because the voice VLAN and access VLAN are swapped. The access VLAN should be the data VLAN (e.g., VLAN 10) and the voice VLAN should be VLAN 110. The switchport voice vlan command assigns the voice VLAN, not the access VLAN.

  • ✗

    interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 switchport voice vlan 110 power inline priority high ! interface GigabitEthernet0/2 switchport mode access power inline priority critical

    Why it's wrong here

    This is incorrect because the PoE priorities are reversed. The IP phone should have critical priority, and the access point should have high priority. The question specifies that the phone gets critical and the AP gets high.

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.

✓interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 switchport voice vlan 110 power inline priority critical ! interface GigabitEthernet0/2 switchport mode access power inline priority highCorrect answer▾

Why this is correct

This configuration correctly sets the IP phone port (Gi0/1) with voice VLAN 110 and PoE priority critical, and the AP port (Gi0/2) with PoE priority high. The switchport voice vlan command is used to assign the voice VLAN, and power inline priority sets the PoE priority. The access VLAN (vlan 10) is also configured for the phone's data traffic.

✗interface GigabitEthernet0/1 switchport mode trunk switchport trunk allowed vlan 10,110 power inline priority critical ! interface GigabitEthernet0/2 switchport mode access power inline priority highWrong answer — click to see why▾

Why this is wrong here

The specific factual error is using trunk mode for an IP phone port instead of access mode with voice VLAN.

Why candidates choose this

Candidates might think that because the phone uses two VLANs (data and voice), a trunk is required, but Cisco IP phones use CDP to negotiate the voice VLAN on an access port.

✗interface GigabitEthernet0/1 switchport mode access switchport access vlan 110 switchport voice vlan 10 power inline priority critical ! interface GigabitEthernet0/2 switchport mode access power inline priority highWrong answer — click to see why▾

Why this is wrong here

The specific factual error is reversing the VLAN assignments: the access VLAN should be data, and the voice VLAN should be voice.

Why candidates choose this

Candidates may confuse which VLAN is for data and which is for voice, especially if the question does not specify the data VLAN number.

✗interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 switchport voice vlan 110 power inline priority high ! interface GigabitEthernet0/2 switchport mode access power inline priority criticalWrong answer — click to see why▾

Why this is wrong here

The specific factual error is swapping the PoE priority values: the phone should be critical, the AP high.

Why candidates choose this

Candidates might assume the AP needs higher priority because it serves multiple clients, but the question explicitly states the phone gets critical.

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 the IP phone port is configured as a trunk, which is not necessary for a single IP phone. The phone uses the voice VLAN feature on an access port, not a trunk. Additionally, the voice VLAN should be configured with the switchport voice vlan command, not by trunking.

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: interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 switchport voice vlan 110 power inline priority critical ! interface GigabitEthernet0/2 switchport mode access power inline priority high — The IP phone requires a voice VLAN configured with the switchport voice vlan command. PoE priority is set per interface using power inline priority. For the phone, the priority is critical; for the AP, it is high. Verification with show interfaces switchport confirms voice VLAN, and show power inline shows priority settings.

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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