Question 1,626 of 2,152

DHCP (IPv4 and IPv6) →hardMultiple ChoiceObjective-mapped

300-410 DHCP (IPv4 and IPv6) Practice Question

This 300-410 practice question tests your understanding of dhcp (ipv4 and ipv6). The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

An engineer configures DHCP snooping on a switch to prevent rogue DHCP servers. After enabling, legitimate DHCP clients on VLAN 10 cannot obtain addresses. The DHCP server is connected to a trusted port. The switch shows 'show ip dhcp snooping binding' with no entries. Which is the most likely explanation?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1hardmultiple choice

Open the full VLAN trunking answer →

A
The DHCP server is on a different subnet, and no DHCP relay is configured; the switch only snoops broadcast traffic within the VLAN.
Correct: DHCP snooping relies on seeing the DHCP packets. Without a relay, the server may not be reachable, or the packets may not traverse the switch.
B
The trusted port is configured as an access port in VLAN 10, but the server is in VLAN 20.
Why wrong: Incorrect: The trusted port should be in the same VLAN as the server, but the issue is about relay.
C
The switch has 'ip dhcp snooping information option' disabled, preventing binding creation.
Why wrong: Incorrect: Option 82 is not required for binding creation; it is an additional feature.
D
The DHCP server is using a different MAC address than expected, causing the switch to drop the packets.
Why wrong: Incorrect: DHCP snooping does not filter based on server MAC unless configured.

Full breakdown with real-world context →

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

✓

The DHCP server is on a different subnet, and no DHCP relay is configured; the switch only snoops broadcast traffic within the VLAN.

DHCP snooping builds a binding database by snooping DHCPACK messages. If the switch does not see the DHCPACK (e.g., due to asymmetric routing or the server responding on a different VLAN), no bindings are created. A common edge case is that the DHCP server is on a different subnet and the relay agent is not configured, so the DHCP requests are broadcast and not forwarded.

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.

✓
The DHCP server is on a different subnet, and no DHCP relay is configured; the switch only snoops broadcast traffic within the VLAN.
Why this is correct
Correct: DHCP snooping relies on seeing the DHCP packets. Without a relay, the server may not be reachable, or the packets may not traverse the switch.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Access ports place end devices into a single VLAN.
✗
The trusted port is configured as an access port in VLAN 10, but the server is in VLAN 20.
Why it's wrong here
Incorrect: The trusted port should be in the same VLAN as the server, but the issue is about relay.
✗
The switch has 'ip dhcp snooping information option' disabled, preventing binding creation.
Why it's wrong here
Incorrect: Option 82 is not required for binding creation; it is an additional feature.
✗
The DHCP server is using a different MAC address than expected, causing the switch to drop the packets.
Why it's wrong here
Incorrect: DHCP snooping does not filter based on server MAC unless configured.

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 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: The DHCP server is on a different subnet, and no DHCP relay is configured; the switch only snoops broadcast traffic within the VLAN. — DHCP snooping builds a binding database by snooping DHCPACK messages. If the switch does not see the DHCPACK (e.g., due to asymmetric routing or the server responding on a different VLAN), no bindings are created. A common edge case is that the DHCP server is on a different subnet and the relay agent is not configured, so the DHCP requests are broadcast and not forwarded.

What should I do if I get this 300-410 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Access ports place end devices into a single VLAN.

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