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Question 1,242 of 1,052
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CCNA Practice Question: Which TWO statements are true about configuring…
This 200-301 practice question tests your understanding of 200-301 exam topics. 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.
Which TWO statements are true about configuring and verifying VLANs, 802.1Q trunking, native VLAN, and inter-VLAN routing with router-on-a-stick?
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
✓
On a router-on-a-stick configuration, each subinterface must be configured with an IP address and the encapsulation dot1Q command to specify the VLAN ID.
The correct answers are A and D. Option A is correct because on a router-on-a-stick configuration, each subinterface must be assigned an IP address in the respective VLAN's subnet, and the encapsulation dot1Q command is used to associate the subinterface with a specific VLAN ID. Option D is correct because the native VLAN (default VLAN 1) is not tagged on an 802.1Q trunk; frames in the native VLAN are sent untagged, and the switch and router must agree on the native VLAN to avoid miscommunication. Option B is incorrect because the native VLAN is not tagged; tagging applies to all other VLANs. Option C is incorrect because the switchport trunk allowed vlan command only restricts which VLANs are allowed; it does not set the native VLAN. Option E is incorrect because show interfaces trunk displays trunk status and allowed VLANs, but not the IP addresses of subinterfaces (which are shown by show ip interface brief or show running-config).
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.
- ✓
On a router-on-a-stick configuration, each subinterface must be configured with an IP address and the encapsulation dot1Q command to specify the VLAN ID.
- ✗
The native VLAN is always tagged on an 802.1Q trunk link.
Why it's wrong here
This is incorrect because the native VLAN is specifically the VLAN that is not tagged on an 802.1Q trunk; all other VLANs are tagged.
- ✗
The command switchport trunk native vlan 10 is used to restrict which VLANs are allowed on a trunk.
Why it's wrong here
This is incorrect because switchport trunk native vlan 10 sets the native VLAN to 10, not restricts allowed VLANs.
- ✓
When configuring a router-on-a-stick, the native VLAN must match on both the switch and the router subinterface to avoid miscommunication.
Why this is correct
This is correct because if the native VLAN differs, the router may interpret untagged frames incorrectly, leading to connectivity issues.
Related concept
Access ports place end devices into a single VLAN.
- ✗
The command show interfaces trunk displays the IP addresses configured on router subinterfaces.
Why it's wrong here
This is incorrect because show interfaces trunk is a switch command that shows trunk status and allowed VLANs, not router IP addresses.
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.
✓On a router-on-a-stick configuration, each subinterface must be configured with an IP address and the encapsulation dot1Q command to specify the VLAN ID.Correct answer▾
Why this is correct
This is correct because the router needs a subinterface per VLAN, each with an IP address and the dot1Q encapsulation to identify the VLAN.
✗The native VLAN is always tagged on an 802.1Q trunk link.Wrong answer — click to see why▾
Why this is wrong here
The native VLAN is sent untagged to maintain backward compatibility with devices that do not understand 802.1Q tagging.
✗The command switchport trunk native vlan 10 is used to restrict which VLANs are allowed on a trunk.Wrong answer — click to see why▾
Why this is wrong here
The command to restrict allowed VLANs is switchport trunk allowed vlan, not the native VLAN command.
✗The command show interfaces trunk displays the IP addresses configured on router subinterfaces.Wrong answer — click to see why▾
Why this is wrong here
To see IP addresses on subinterfaces, use show ip interface brief or show running-config on the router.
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 show interfaces trunk is a switch command that shows trunk status and allowed VLANs, not router IP addresses.
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?
Access ports place end devices into a single VLAN.
What is the correct answer to this question?
The correct answer is: On a router-on-a-stick configuration, each subinterface must be configured with an IP address and the encapsulation dot1Q command to specify the VLAN ID. — The correct answers are A and D. Option A is correct because on a router-on-a-stick configuration, each subinterface must be assigned an IP address in the respective VLAN's subnet, and the encapsulation dot1Q command is used to associate the subinterface with a specific VLAN ID. Option D is correct because the native VLAN (default VLAN 1) is not tagged on an 802.1Q trunk; frames in the native VLAN are sent untagged, and the switch and router must agree on the native VLAN to avoid miscommunication. Option B is incorrect because the native VLAN is not tagged; tagging applies to all other VLANs. Option C is incorrect because the switchport trunk allowed vlan command only restricts which VLANs are allowed; it does not set the native VLAN. Option E is incorrect because show interfaces trunk displays trunk status and allowed VLANs, but not the IP addresses of subinterfaces (which are shown by show ip interface brief or show running-config).
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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