- A
Configure 'no ip dhcp server' under the interface associated with the VLAN.
Correct. This command disables the DHCP server functionality on that specific interface, preventing it from responding to DHCP requests on that VLAN.
- B
Configure 'ip dhcp excluded-address' for the entire subnet of the VLAN.
Why wrong: Incorrect. The 'ip dhcp excluded-address' command only prevents the server from assigning those specific addresses; it does not stop the server from offering DHCP services on the VLAN.
- C
Disable DHCP snooping on the VLAN using 'no ip dhcp snooping vlan <vlan-id>'.
Correct. If DHCP snooping is enabled globally, disabling it on a specific VLAN prevents the router from acting as a DHCP server (since snooping is required for server operation in many deployments, but more accurately, disabling snooping on the VLAN stops the router from processing DHCP packets as a server on that VLAN).
- D
Configure 'ip dhcp relay information trusted' on the interface.
Why wrong: Incorrect. This command is used to trust DHCP relay agent information (option 82) and does not affect the router's ability to act as a DHCP server.
- E
Use the global command 'no service dhcp'.
Why wrong: Incorrect. This command disables the DHCP server and relay agent globally on the router, affecting all VLANs, not just a specific one.
Quick Answer
The answer is to disable DHCP snooping on the specific VLAN using the 'no ip dhcp snooping vlan <vlan-id>' command, or to apply the 'no ip dhcp server' command under the interface configuration. These two actions directly prevent the router from offering DHCP services on that VLAN because DHCP snooping acts as a per-VLAN filter for server messages, while the interface-level command explicitly stops the router from acting as a server on that link. On the Cisco CCNP ENARSI 300-410 exam, this question tests your understanding of how to granularly control DHCP server behavior without disabling the global 'service dhcp' process, which would affect all VLANs. A common trap is confusing 'ip dhcp excluded-address' or 'ip dhcp relay information trusted' with VLAN-level prevention—these do not stop the server from responding. Memory tip: think of "snoop or stop the port"—disable snooping on the VLAN or kill the server on the interface.
300-410 DHCP (IPv4 and IPv6) Practice Question
This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 actions will prevent a Cisco IOS router from acting as a DHCPv4 server for a specific VLAN? (Choose TWO.)
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 'no ip dhcp server' under the interface associated with the VLAN.
To prevent a router from offering DHCP services on a VLAN, you can either disable DHCP snooping on that VLAN (if snooping is enabled globally) or use the 'no ip dhcp server' command under the interface. Alternatively, you can configure the interface with 'ip dhcp relay information trusted' but that does not prevent server operation. The 'ip dhcp excluded-address' command only excludes specific addresses from the pool, not entire VLANs. The 'service dhcp' command globally enables or disables DHCP, not per-VLAN.
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.
- ✓
Configure 'no ip dhcp server' under the interface associated with the VLAN.
- ✗
Configure 'ip dhcp excluded-address' for the entire subnet of the VLAN.
- ✓
Disable DHCP snooping on the VLAN using 'no ip dhcp snooping vlan <vlan-id>'.
Why this is correct
Correct. If DHCP snooping is enabled globally, disabling it on a specific VLAN prevents the router from acting as a DHCP server (since snooping is required for server operation in many deployments, but more accurately, disabling snooping on the VLAN stops the router from processing DHCP packets as a server on that VLAN).
Related concept
Access ports place end devices into a single VLAN.
- ✗
Configure 'ip dhcp relay information trusted' on the interface.
Why it's wrong here
Incorrect. This command is used to trust DHCP relay agent information (option 82) and does not affect the router's ability to act as a DHCP server.
- ✗
Use the global command 'no service dhcp'.
Why it's wrong here
Incorrect. This command disables the DHCP server and relay agent globally on the router, affecting all VLANs, not just a specific one.
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
Incorrect. The 'ip dhcp excluded-address' command only prevents the server from assigning those specific addresses; it does not stop the server from offering DHCP services on the VLAN.
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 300-410 questions on switching, trunking, and access-port configuration.
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FAQ
Questions learners often ask
What does this 300-410 question test?
DHCP (IPv4 and IPv6) — This question tests DHCP (IPv4 and IPv6) — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Configure 'no ip dhcp server' under the interface associated with the VLAN. — To prevent a router from offering DHCP services on a VLAN, you can either disable DHCP snooping on that VLAN (if snooping is enabled globally) or use the 'no ip dhcp server' command under the interface. Alternatively, you can configure the interface with 'ip dhcp relay information trusted' but that does not prevent server operation. The 'ip dhcp excluded-address' command only excludes specific addresses from the pool, not entire VLANs. The 'service dhcp' command globally enables or disables DHCP, not per-VLAN.
What should I do if I get this 300-410 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 300-410 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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Last reviewed: Jun 19, 2026
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