- A
Option 82 is inserted by the DHCP client to identify itself to the server.
Why wrong: Incorrect. Option 82 is inserted by the DHCP relay agent, not the client.
- B
The relay agent must be configured with the 'ip dhcp relay information option' command to insert option 82.
Correct. This command enables the relay agent to add option 82 to DHCP packets before forwarding them to the server.
- C
The DHCP server can use option 82 to select an IP address from a specific pool based on the circuit ID.
Correct. The server can be configured to match the circuit ID or remote ID in option 82 to a specific pool, allowing per-interface or per-VLAN address assignment.
- D
Option 82 is only supported in DHCPv6.
Why wrong: Incorrect. Option 82 is defined for DHCPv4 (RFC 3046) and is also used in DHCPv6 as option 18 (interface-id) and option 37 (remote-id).
- E
The 'ip dhcp relay information trusted' command must be configured on the relay agent to insert option 82.
Why wrong: Incorrect. The 'ip dhcp relay information trusted' command is used on the server side to trust option 82 information received from relay agents, not to insert it.
DHCPv4 Option 82 (Relay Agent Information)
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 statements about DHCPv4 option 82 are true? (Choose TWO.)
Quick Answer
The correct answer is that the DHCP server can use option 82 to select an IP address from a specific pool based on the circuit ID. This works because DHCPv4 option 82, known as the Relay Agent Information option, allows a relay agent to insert identifying data—such as the circuit ID and remote ID—into client DHCP packets. The DHCP server then reads this location-specific information to assign an address from a pool that matches the client’s network segment, enabling policy-based IP allocation. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how relay agents interact with DHCP servers in complex enterprise networks; a common trap is confusing the relay agent as the source of option 82 insertion versus the client. Remember that the client never uses or sees option 82—it is strictly added by the relay agent using the `ip dhcp relay information option` command. A helpful memory tip: “Relay inserts, server selects—client never inspects.”
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 agent must be configured with the 'ip dhcp relay information option' command to insert option 82.
Option B is correct because the 'ip dhcp relay information option' command must be explicitly configured on a Cisco IOS DHCP relay agent to enable the insertion of DHCP option 82 (Relay Agent Information). Without this command, the relay agent will forward DHCP packets without adding option 82, even if the server expects it. This command is required to allow the relay agent to insert the circuit ID and remote ID sub-options into DHCPv4 packets.
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.
- ✗
Option 82 is inserted by the DHCP client to identify itself to the server.
Why it's wrong here
Incorrect. Option 82 is inserted by the DHCP relay agent, not the client.
- ✓
The relay agent must be configured with the 'ip dhcp relay information option' command to insert option 82.
Why this is correct
Correct. This command enables the relay agent to add option 82 to DHCP packets before forwarding them to the server.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
The DHCP server can use option 82 to select an IP address from a specific pool based on the circuit ID.
Why this is correct
Correct. The server can be configured to match the circuit ID or remote ID in option 82 to a specific pool, allowing per-interface or per-VLAN address assignment.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Option 82 is only supported in DHCPv6.
Why it's wrong here
Incorrect. Option 82 is defined for DHCPv4 (RFC 3046) and is also used in DHCPv6 as option 18 (interface-id) and option 37 (remote-id).
- ✗
The 'ip dhcp relay information trusted' command must be configured on the relay agent to insert option 82.
Why it's wrong here
Incorrect. The 'ip dhcp relay information trusted' command is used on the server side to trust option 82 information received from relay agents, not to insert it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between the command that inserts option 82 ('ip dhcp relay information option') and the command that trusts incoming option 82 ('ip dhcp relay information trusted'), leading candidates to confuse the two.
Trap categories for this question
Command / output trap
Incorrect. The 'ip dhcp relay information trusted' command is used on the server side to trust option 82 information received from relay agents, not to insert it.
Detailed technical explanation
How to think about this question
Option 82, defined in RFC 3046, allows a DHCP relay agent to insert sub-options like circuit ID (identifying the incoming interface or VLAN) and remote ID (identifying the client's access node). This enables the DHCP server to assign IP addresses from a specific pool based on the client's physical location, which is critical in service provider or enterprise networks with multiple subnets behind a single relay agent. The relay agent must be configured to add this information, and the server must be configured to parse it, often using the 'ip dhcp class' and 'ip dhcp pool' commands to match the circuit ID.
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 practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Visual reference
What to study next
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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 agent must be configured with the 'ip dhcp relay information option' command to insert option 82. — Option B is correct because the 'ip dhcp relay information option' command must be explicitly configured on a Cisco IOS DHCP relay agent to enable the insertion of DHCP option 82 (Relay Agent Information). Without this command, the relay agent will forward DHCP packets without adding option 82, even if the server expects it. This command is required to allow the relay agent to insert the circuit ID and remote ID sub-options into DHCPv4 packets.
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: Jul 4, 2026
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