CCNA Switching and Network Access Practice Question
Exhibit
Switch port requirement: - IP phone and PC share one physical access connection - Voice and data must remain logically separate
A switchport connected to an IP phone and a PC must carry user traffic and voice traffic separately. Which feature is designed for that purpose on a Cisco access port?
⚠ Common exam trap
Be cautious not to confuse VLAN-related terms. Understand that voice VLAN is specifically designed for separating voice and data traffic on access ports.
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
✓
Voice VLAN
The correct feature is a voice VLAN. In plain language, a voice VLAN lets the switch treat the IP phone’s traffic differently from the user PC’s traffic even though both devices may be connected through the same physical access port. The phone can tag voice traffic for the voice VLAN while the PC remains in the normal data access VLAN. This is a practical design because it keeps voice traffic logically separate, which helps with policy, QoS, and management. This is a classic CCNA switching concept because it shows that one physical edge port can still support more than one logical traffic type in a controlled way. A standard access VLAN by itself would not provide the same voice/data separation. EtherChannel, SPAN, and native VLAN concepts solve different problems. The best answer is the feature specifically built to support phones and workstations together on one access connection while keeping their traffic logically distinct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Voice VLAN
Why this is correct
A voice VLAN is the correct feature because it lets a single access switchport carry both an IP phone's 802.1Q-tagged voice frames and the PC's untagged data frames in the native/configured access VLAN. The phone is configured to tag its media with the Voice VLAN ID while leaving PC traffic untagged, enabling logical separation of voice and data on one physical port.
- ✗
EtherChannel
Why it's wrong here
EtherChannel is a method of aggregating multiple physical switchports into a single logical link to increase bandwidth and provide redundancy, typically between switches or to a server. It does not classify or separate traffic by VLAN or device type on a single edge port, so it cannot address the requirement to carry distinct voice and user data from one PC-and-phone combination.
When this WOULD be correct
If the exam question asked about increasing bandwidth for a connection between a switch and a server by aggregating multiple links, then EtherChannel would be the correct answer, as it allows for load balancing and redundancy across those links.
- ✗
SPAN
Why it's wrong here
SPAN (Switch Port Analyzer) is used to duplicate traffic from a source port or VLAN to a destination port for monitoring, troubleshooting, or security analysis—not to forward normal production traffic. Configuring SPAN would not designate a separate VLAN for voice; it would only create a mirror stream of existing frames, leaving the phone and PC without the required VLAN separation.
When this WOULD be correct
If the question were about monitoring traffic for troubleshooting purposes on a switch port, SPAN would be the correct answer. For example, a question might ask which feature allows an administrator to capture and analyze traffic from a specific port without affecting the normal operation of the network.
- ✗
Native VLAN
Why it's wrong here
The native VLAN is an 802.1Q trunking concept, not an access-port separation mechanism. On a link with a phone and PC, you would still be on an access port; using a native VLAN would only define which VLAN receives untagged traffic on a trunk and would not provide the specialized voice-specific handling that a voice VLAN offers for the phone's tagged traffic.
When this WOULD be correct
If the question asked about configuring a trunk port to carry multiple VLANs, including untagged traffic, the Native VLAN would be the correct answer. In that scenario, it would refer to the VLAN that carries untagged frames on a trunk link.
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.
✓Voice VLANCorrect answer▾
Why this is correct
A voice VLAN is the correct feature because it lets a single access switchport carry both an IP phone's 802.1Q-tagged voice frames and the PC's untagged data frames in the native/configured access VLAN. The phone is configured to tag its media with the Voice VLAN ID while leaving PC traffic untagged, enabling logical separation of voice and data on one physical port.
✗EtherChannelWrong answer — click to see why▾
Why this is wrong here
EtherChannel is a technology used to combine multiple physical links into a single logical link for increased bandwidth and redundancy, but it does not separate user and voice traffic on a switchport. Therefore, it does not fulfill the requirement of carrying voice and user traffic separately.
★ When this WOULD be the correct answer
If the exam question asked about increasing bandwidth for a connection between a switch and a server by aggregating multiple links, then EtherChannel would be the correct answer, as it allows for load balancing and redundancy across those links.
Why candidates choose this
Candidates may choose EtherChannel because they associate it with improving network performance and may overlook the specific requirement of separating voice and user traffic, leading to confusion about the correct technology for the scenario presented.
✗SPANWrong answer — click to see why▾
Why this is wrong here
SPAN (Switched Port Analyzer) is used for monitoring and capturing traffic on a switch port, not for separating user and voice traffic. It does not provide the necessary functionality to handle VLANs for voice and data traffic on a single port.
★ When this WOULD be the correct answer
If the question were about monitoring traffic for troubleshooting purposes on a switch port, SPAN would be the correct answer. For example, a question might ask which feature allows an administrator to capture and analyze traffic from a specific port without affecting the normal operation of the network.
Why candidates choose this
Candidates may choose SPAN because they associate it with traffic management and monitoring, thinking it could help in separating or analyzing voice and data traffic, despite it not being the correct feature for VLAN separation.
✗Native VLANWrong answer — click to see why▾
Why this is wrong here
The Native VLAN is used for untagged traffic on a trunk port and does not separate voice and user traffic on an access port. It is not designed to handle the specific requirements of carrying both voice and data traffic separately.
★ When this WOULD be the correct answer
If the question asked about configuring a trunk port to carry multiple VLANs, including untagged traffic, the Native VLAN would be the correct answer. In that scenario, it would refer to the VLAN that carries untagged frames on a trunk link.
Why candidates choose this
Candidates may confuse the Native VLAN with the concept of VLANs in general, thinking it plays a role in traffic separation, especially if they are familiar with VLAN configurations but not the specific requirements for voice and data separation.
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?”
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Related to this question
Learn chapter
Configuring Switch Ports for Desktops, VoIP Phones, APs, IoT, and Virtualized Hosts
Key term
Cisco Discovery Protocol
A proprietary Layer 2 network protocol used by Cisco devices to discover information about directly connected neighbor devices.
Key term
Voice VLAN
A Voice VLAN is a separate virtual local area network configured on a network switch to carry voice traffic, such as from IP phones, ensuring quality of service and security by isolating it from data traffic.
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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.