- A
Enable Dynamic ARP Inspection on VLAN 10.
Why wrong: Enabling DAI will not permit DHCP server replies because DAI validates ARP packets against the DHCP snooping binding table; it does not change the trust state of the DHCP server port. DHCP offers will still be blocked.
- B
Configure interface Gi0/1 as a DHCP snooping trusted port.
DHCP snooping blocks DHCP server messages on untrusted ports. Since the legitimate server is on Gi0/1, trusting the port allows the switch to forward DHCP offers from that port, resolving the issue.
- C
Add an ip helper-address on the VLAN 10 SVI pointing to the DHCP server.
Why wrong: An ip helper-address is used to forward DHCP broadcasts across IP subnets. Here, clients and server are in the same VLAN, so no forwarding is needed; the server's replies are simply being blocked by snooping.
- D
Reconfigure the DHCP server scope to include DHCP Option 82.
Why wrong: DHCP Option 82 is inserted by relay agents, not by the server itself. Modifying the scope does not affect whether the switch drops DHCP offers due to snooping port trust.
CCNA Switching and Network Access Practice Question
This 200-301 practice question tests your understanding of switching and network access. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
After configuring DHCP snooping on VLAN 10 to prevent rogue DHCP servers, all clients in the VLAN stop receiving DHCP offers from the legitimate DHCP server that is connected to port Gi0/1. The administrator verifies the DHCP server is operational and reachable. What should the technician do next?
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
Configure interface Gi0/1 as a DHCP snooping trusted port.
By default, DHCP snooping marks all ports as untrusted, which blocks DHCP server replies (including offers) from those ports. Since the legitimate server is connected to Gi0/1, the port must be explicitly trusted to allow DHCP offers through. This step directly addresses the Layer 2 access control mechanism.
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.
- ✗
Enable Dynamic ARP Inspection on VLAN 10.
Why it's wrong here
Enabling DAI will not permit DHCP server replies because DAI validates ARP packets against the DHCP snooping binding table; it does not change the trust state of the DHCP server port. DHCP offers will still be blocked.
- ✓
Configure interface Gi0/1 as a DHCP snooping trusted port.
Why this is correct
DHCP snooping blocks DHCP server messages on untrusted ports. Since the legitimate server is on Gi0/1, trusting the port allows the switch to forward DHCP offers from that port, resolving the issue.
Related concept
Access ports place end devices into a single VLAN.
- ✗
Add an ip helper-address on the VLAN 10 SVI pointing to the DHCP server.
- ✗
Reconfigure the DHCP server scope to include DHCP Option 82.
Why it's wrong here
DHCP Option 82 is inserted by relay agents, not by the server itself. Modifying the scope does not affect whether the switch drops DHCP offers due to snooping port trust.
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.
✓Configure interface Gi0/1 as a DHCP snooping trusted port.Correct answer▾
Why this is correct
DHCP snooping blocks DHCP server messages on untrusted ports. Since the legitimate server is on Gi0/1, trusting the port allows the switch to forward DHCP offers from that port, resolving the issue.
✗Enable Dynamic ARP Inspection on VLAN 10.Wrong answer — click to see why▾
Why this is wrong here
Misunderstanding that DAI controls DHCP traffic rather than ARP packets.
✗Add an ip helper-address on the VLAN 10 SVI pointing to the DHCP server.Wrong answer — click to see why▾
Why this is wrong here
Assuming DHCP snooping introduces routing changes or that the server is on a different subnet.
✗Reconfigure the DHCP server scope to include DHCP Option 82.Wrong answer — click to see why▾
Why this is wrong here
Confusing DHCP snooping with DHCP relay agent functionality and option 82 insertion.
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.
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?
Switching and Network Access — This question tests Switching and Network Access — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Configure interface Gi0/1 as a DHCP snooping trusted port. — By default, DHCP snooping marks all ports as untrusted, which blocks DHCP server replies (including offers) from those ports. Since the legitimate server is connected to Gi0/1, the port must be explicitly trusted to allow DHCP offers through. This step directly addresses the Layer 2 access control mechanism.
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.
About these practice questions
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Last reviewed: Jun 14, 2026
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