CCNA Switching and Network Access Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  It separates voice and data traffic on the same edge port by assigning them to different VLANs.

  Why this is correct

  The `switchport voice vlan 150` command marks the port as a Cisco Unified Communications access port, so it instructs an attached IP phone to tag its voice frames with VLAN 150 while the PC behind the phone remains untagged on the data VLAN. As a result, voice and data traffic share the same physical cable but are isolated into separate Layer 2 broadcast domains, allowing distinct QoS policies, subnets, and security controls to be applied independently.

• ✗

  It turns the port into a routed WAN interface.

  Why it's wrong here

  This command operates in Layer 2 switching context; it does not assign an IP address or convert the interface into a routed port. A routed WAN interface would be a Layer 3 port with an IP configuration, typically using point-to-point protocol encapsulation or a WAN-capable interface, none of which is implied by a voice VLAN assignment on an access switchport.

  When this WOULD be correct

  In a different scenario, a question might ask about the configuration of a switch port in a router-on-a-stick setup, where the context involves routing between VLANs. In that case, a response indicating that the port is configured as a routed WAN interface could be correct if it explicitly states that the port is configured for inter-VLAN routing.

• ✗

  It forces the phone to use CAPWAP before receiving power.

  Why it's wrong here

  CAPWAP is a control/forwarding protocol used between wireless LAN controllers and access points to manage tunneling; it has no role in wired phone VLAN assignment. An IP phone learns the voice VLAN through CDP/LLDP or via local configuration after receiving Power over Ethernet, not through CAPWAP, so this command does not force any CAPWAP behavior.

  When this WOULD be correct

  If the question were about the configuration of a wireless access point that requires a specific protocol for power delivery and management, such as CAPWAP, then this option could be correct. For example, a question might ask about the setup of a VoIP phone connected to a wireless network that utilizes CAPWAP for device management.

• ✗

  It makes VLAN 150 the native VLAN on all trunks automatically.

  Why it's wrong here

  The voice VLAN configuration is scoped to a single edge access port and its attached phone, not to the switch's trunk infrastructure. Native VLAN behavior on trunk ports is configured separately with `switchport trunk native vlan`, and in fact voice traffic is normally tagged with VLAN 150 while data remains untagged, so VLAN 150 is not the native VLAN on any link unless expressly designed that way.

  When this WOULD be correct

  In a different question, if it asked about the behavior of a switch when configuring a trunk port with 'switchport trunk native vlan 150', this option would be correct as it would indicate that VLAN 150 is set as the native VLAN for all trunk links.

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.

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?”