- A
The relay information option should not be configured on the server interface; it is intended for relay agents and may cause DHCP packets to be dropped or misprocessed.
The ip dhcp relay information option is meant for interfaces acting as DHCP relay agents. On a server interface, it can cause the server to add Option 82 to its own packets, leading to confusion or packet rejection.
- B
The lease duration of 7 days is invalid; valid lease values are in hours or minutes only.
Why wrong: The lease can be specified in days, hours, or minutes. A value of 7 means 7 days, which is valid.
- C
The default-router address is missing the subnet mask, which will cause clients to receive an incomplete configuration.
Why wrong: The default-router command only requires the IP address; the subnet mask is not needed here.
- D
The DNS server address is on the same subnet as the clients, which is not allowed.
Why wrong: The DNS server can be on the same subnet; there is no restriction against it.
Quick Answer
The answer is that the `ip dhcp relay information option` command is misconfigured on the DHCP server interface, as it should only be applied to relay agents, not the server itself. This command instructs the device to insert Option 82 (Relay Agent Information) into DHCP packets, but when placed on a server-facing interface, the server begins expecting and processing this option on incoming requests, which can cause malformed packets, dropped DHCP offers, or misrouted replies. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of DHCP relay operations versus server roles—a common trap is assuming any interface can use this command without consequence. The key distinction is that Option 82 is for relay agents to add location or circuit ID data, not for servers to generate it. Memory tip: "Relay adds the tag, server just brags"—meaning the relay inserts the information option, while the server only processes it, never generates it.
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.
Router R3 has the following DHCP configuration: ip dhcp pool POOL2 network 10.10.10.0 255.255.255.0
default-router 10.10.10.1 dns-server 10.10.10.2 lease 7 !
interface GigabitEthernet0/0 ip address 10.10.10.1 255.255.255.0 ip dhcp relay information option no shutdown
What is the problem with this configuration?
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 relay information option should not be configured on the server interface; it is intended for relay agents and may cause DHCP packets to be dropped or misprocessed.
The 'ip dhcp relay information option' command is intended for DHCP relay agents to insert Option 82 (Relay Agent Information) into DHCP packets. When configured on a DHCP server interface, it causes the server to expect and process Option 82, but since the server itself is not a relay agent, this can lead to malformed packets, dropped requests, or misprocessing of DHCP messages. In this scenario, R3 is acting as the DHCP server on GigabitEthernet0/0, so the command should be removed to ensure normal DHCP operation.
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 relay information option should not be configured on the server interface; it is intended for relay agents and may cause DHCP packets to be dropped or misprocessed.
Why this is correct
The ip dhcp relay information option is meant for interfaces acting as DHCP relay agents. On a server interface, it can cause the server to add Option 82 to its own packets, leading to confusion or packet rejection.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The lease duration of 7 days is invalid; valid lease values are in hours or minutes only.
Why it's wrong here
The lease can be specified in days, hours, or minutes. A value of 7 means 7 days, which is valid.
- ✗
The default-router address is missing the subnet mask, which will cause clients to receive an incomplete configuration.
Why it's wrong here
The default-router command only requires the IP address; the subnet mask is not needed here.
- ✗
The DNS server address is on the same subnet as the clients, which is not allowed.
Why it's wrong here
The DNS server can be on the same subnet; there is no restriction against it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that 'ip dhcp relay information option' is a generic DHCP feature that can be applied anywhere, when in fact it is strictly for relay agents and causes problems if enabled on a DHCP server interface.
Trap categories for this question
Command / output trap
The default-router command only requires the IP address; the subnet mask is not needed here.
Detailed technical explanation
How to think about this question
The 'ip dhcp relay information option' command enables RFC 3046 (DHCP Relay Agent Information Option) support, which is used by relay agents to add Option 82 for subnet selection or security. On a server, this command can cause the server to insert Option 82 into replies or to expect it in requests, leading to interoperability issues if clients or relays do not support it. In real-world deployments, misconfiguring this on a server can result in DHCPNAK messages or silent packet drops, especially when the server is directly connected to clients.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
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DHCP (IPv4 and IPv6) — study guide chapter
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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 relay information option should not be configured on the server interface; it is intended for relay agents and may cause DHCP packets to be dropped or misprocessed. — The 'ip dhcp relay information option' command is intended for DHCP relay agents to insert Option 82 (Relay Agent Information) into DHCP packets. When configured on a DHCP server interface, it causes the server to expect and process Option 82, but since the server itself is not a relay agent, this can lead to malformed packets, dropped requests, or misprocessing of DHCP messages. In this scenario, R3 is acting as the DHCP server on GigabitEthernet0/0, so the command should be removed to ensure normal DHCP operation.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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