CCNA Switching and Network Access Practice Question
Network Topology
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.
⚠ Common exam trap
The exam trap is mixing up the voice VLAN and access VLAN assignments, or confusing PoE priority levels. Remember that the voice VLAN is configured with switchport voice vlan, not as the access VLAN. Also, note that IP phones typically use access ports with voice VLAN, not trunks. PoE priority critical is reserved for critical devices like phones, while high is for other important devices like APs.
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.
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.
- ✗
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?”
Visual reference
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Related to this question
Learn chapter
Configuring Switch Ports for Desktops, VoIP Phones, APs, IoT, and Virtualized Hosts
Key term
Switch
A switch is a networking device that connects devices on a local area network and uses MAC addresses to forward data only to the intended recipient.
Key term
Access Point
An access point is a device that creates a wireless local area network, usually by connecting to a wired network and broadcasting a Wi-Fi signal for computers, phones, and tablets to join.
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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.