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.

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 its binding database by monitoring DHCPACK messages from trusted ports. If the DHCP server is on a different subnet than the clients (VLAN 10) and no DHCP relay (ip helper-address) is configured, the server's unicast reply never reaches the switch, so no snooping bindings are created. The switch only snoops broadcast DHCP traffic within the VLAN; without relay, the server's response is unicast and may not be seen by the snooping switch, leaving the binding table empty and clients unable to obtain addresses.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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
Read the scenario before looking for a memorised answer.
✗
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: answer the scenario, not the keyword

Cisco often tests the misconception that DHCP snooping automatically works across subnets, when in fact a DHCP relay (ip helper-address) is required for the switch to see the server's unicast reply and build bindings.

Detailed technical explanation

How to think about this question

DHCP snooping relies on the switch seeing the DHCPACK from the server to populate its binding table. When the server is on a different subnet, the DHCPDISCOVER broadcast is relayed by the switch (if ip helper-address is configured) as a unicast to the server, and the server's reply is unicast back to the relay agent, which then forwards it as a unicast to the client. Without relay, the server never receives the broadcast, so no DHCPOFFER or ACK is generated, and the binding table remains empty. This scenario is common in multi-VLAN designs where the DHCP server is centralized.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.

Visual reference

What to study next

Got this wrong? Here's your next step.

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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) — Read the scenario before looking for a memorised answer..

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 its binding database by monitoring DHCPACK messages from trusted ports. If the DHCP server is on a different subnet than the clients (VLAN 10) and no DHCP relay (ip helper-address) is configured, the server's unicast reply never reaches the switch, so no snooping bindings are created. The switch only snoops broadcast DHCP traffic within the VLAN; without relay, the server's response is unicast and may not be seen by the snooping switch, leaving the binding table empty and clients unable to obtain addresses.

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

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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?

Read the scenario before looking for a memorised answer.

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