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Switching and Network Access →hardConfigurationObjective-mapped

CCNA Switching and Network Access Practice Question

Exhibit

Current running-config (partial):
!
hostname MLS1
!
interface GigabitEthernet0/1
 switchport mode access
 switchport access vlan 10
 no shutdown
!
interface GigabitEthernet0/2
 switchport mode access
 switchport access vlan 10
 no shutdown
!
interface Vlan1
 ip address 192.168.1.1 255.255.255.0
 no shutdown
!
end

You are connected to a multilayer switch MLS1 via the console. Configure MLS1 so that IP phones connected to interface GigabitEthernet0/1 receive power via PoE, use VLAN 10 for data traffic, and use VLAN 20 for voice traffic, while the access port for an AP on GigabitEthernet0/2 should be placed in VLAN 30 and have PoE disabled. Verify your configuration using appropriate show commands.

⚠ Common exam trap

A common trap is confusing the voice VLAN command with trunking or swapping the access and voice VLANs. Also, remember that IP phones require PoE, while the AP in this scenario does not. Always verify with show commands.

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 20 power inline auto ! interface GigabitEthernet0/2 switchport mode access switchport access vlan 30 power inline never

For the IP phone port (G0/1), you need to enable PoE (power inline auto) and configure the voice VLAN (switchport voice vlan 20) so that the phone uses VLAN 20 for voice and the access VLAN 10 for data. For the AP port (G0/2), you must change the access VLAN to 30 and disable PoE (power inline never) to prevent powering the AP through the switch. Verify with 'show interfaces switchport' to confirm voice VLAN and access VLAN settings, and 'show power inline' to check PoE status.

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 20 power inline auto ! interface GigabitEthernet0/2 switchport mode access switchport access vlan 30 power inline never

    Why this is correct

    This configuration correctly enables PoE on G0/1 for the IP phone, sets the voice VLAN to 20, and uses access VLAN 10 for data. On G0/2, it sets the access VLAN to 30 and disables PoE for the AP. Verification with 'show interfaces switchport' and 'show power inline' confirms the settings.

  • ✗

    interface GigabitEthernet0/1 switchport mode trunk switchport trunk allowed vlan 10,20 power inline auto ! interface GigabitEthernet0/2 switchport mode access switchport access vlan 30 power inline never

    Why it's wrong here

    This is incorrect because the IP phone port should be an access port, not a trunk. Using a trunk port would require the phone to negotiate trunking, which is not the standard Cisco IP phone deployment. The voice VLAN is configured via 'switchport voice vlan', not by trunking.

  • ✗

    interface GigabitEthernet0/1 switchport mode access switchport access vlan 20 switchport voice vlan 10 power inline auto ! interface GigabitEthernet0/2 switchport mode access switchport access vlan 30 power inline never

    Why it's wrong here

    This is incorrect because the voice VLAN should be 20, not the access VLAN. The access VLAN is for data traffic (typically VLAN 10), and the voice VLAN is for voice traffic. Swapping them would put voice traffic in VLAN 10 and data in VLAN 20, which is not the requirement.

  • ✗

    interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 switchport voice vlan 20 power inline never ! interface GigabitEthernet0/2 switchport mode access switchport access vlan 30 power inline auto

    Why it's wrong here

    This is incorrect because PoE is disabled on the IP phone port (G0/1) and enabled on the AP port (G0/2), which is the opposite of what is required. The IP phone needs PoE to power on, and the AP should have PoE disabled.

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 20 power inline auto ! interface GigabitEthernet0/2 switchport mode access switchport access vlan 30 power inline neverCorrect answer▾

Why this is correct

This configuration correctly enables PoE on G0/1 for the IP phone, sets the voice VLAN to 20, and uses access VLAN 10 for data. On G0/2, it sets the access VLAN to 30 and disables PoE for the AP. Verification with 'show interfaces switchport' and 'show power inline' confirms the settings.

✗interface GigabitEthernet0/1 switchport mode trunk switchport trunk allowed vlan 10,20 power inline auto ! interface GigabitEthernet0/2 switchport mode access switchport access vlan 30 power inline neverWrong answer — click to see why▾

Why this is wrong here

The specific factual error is that IP phones typically use an access port with a voice VLAN, not a trunk port. Trunking is unnecessary and can cause compatibility issues.

Why candidates choose this

Candidates might think that because the phone uses two VLANs (data and voice), a trunk is needed to carry both, but Cisco's voice VLAN feature handles this without trunking.

✗interface GigabitEthernet0/1 switchport mode access switchport access vlan 20 switchport voice vlan 10 power inline auto ! interface GigabitEthernet0/2 switchport mode access switchport access vlan 30 power inline neverWrong answer — click to see why▾

Why this is wrong here

The specific factual error is confusing the access VLAN and voice VLAN assignments. The voice VLAN is configured with 'switchport voice vlan', and the access VLAN with 'switchport access vlan'.

Why candidates choose this

Candidates may misread the requirement or think the voice VLAN is the same as the access VLAN, leading to the swap.

✗interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 switchport voice vlan 20 power inline never ! interface GigabitEthernet0/2 switchport mode access switchport access vlan 30 power inline autoWrong answer — click to see why▾

Why this is wrong here

The specific factual error is reversing the PoE settings: 'power inline never' on the phone port and 'power inline auto' on the AP port.

Why candidates choose this

Candidates might confuse which device needs PoE or mistakenly think the AP requires PoE, but the question explicitly states the AP should have PoE disabled.

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?”

Visual reference

Switch VLAN 10 Sales (192.168.10.0/24) PC-A PC-B VLAN 20 HR (192.168.20.0/24) PC-C PC-D Router VLANs isolate traffic — inter-VLAN routing requires a Layer 3 device

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JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This 200-301 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-301 exam.