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300-410 Practice Question: Which TWO statements about DHCPv4 option 82 are…
Which TWO statements about DHCPv4 option 82 are true? (Choose TWO.)
⚠ Common exam trap
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.
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.
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.
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.
- ✓
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.
- ✗
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.
Visual reference
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Related to this question
Learn chapter
Infrastructure Services: DHCP, NAT, and IPv6
Key term
DHCP Relay Configuration
A DHCP relay configuration allows a router to forward DHCP broadcast requests from clients on one subnet to a DHCP server on a different subnet, enabling centralized IP address management across multiple networks.
Key term
DHCP Client and Server
A DHCP client is any device that requests network configuration settings from a DHCP server, which automatically assigns IP addresses and other parameters to devices on a network.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.