This LPIC-2 practice question tests your understanding of network client management. 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.
A user reports they cannot obtain an IP address via DHCP. The DHCP server logs show no client activity, but the network cable is connected. Which configuration is most likely missing on the DHCP server?
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.
deny unknown-clients
Why wrong: This option would block clients, but it is not missing by default.
default-lease-time
Why wrong: Lease time is not required for initial client discovery.
option domain-name
Why wrong: Domain name is not required for IP address assignment.
subnet declaration
A subnet declaration is required to define the pool of addresses.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
subnet declaration
The DHCP server logs show no client activity, meaning the server is not receiving DHCPDISCOVER packets from the client. The most likely missing configuration is a subnet declaration, which defines the network segment the DHCP server should listen on and allocate addresses from. Without a matching subnet declaration in the DHCP configuration (e.g., /etc/dhcp/dhcpd.conf), the server will ignore requests from that subnet, even if the physical cable is connected.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
deny unknown-clients
Why it's wrong here
This option would block clients, but it is not missing by default.
default-lease-time
Why it's wrong here
Lease time is not required for initial client discovery.
option domain-name
Why it's wrong here
Domain name is not required for IP address assignment.
subnet declaration
Why this is correct
A subnet declaration is required to define the pool of addresses.
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.
Common exam traps
The trap here is that candidates often focus on client-side issues or access control (like deny unknown-clients) when the logs show no activity, but the real cause is the server not being configured to listen on the client's subnet at all.
Detailed technical explanation
The DHCP server uses the subnet declaration to bind to a specific network interface and define the pool of addresses (range) and options for that subnet. Without a subnet declaration matching the client's broadcast domain, the server's DHCP daemon will not listen for or process DHCPDISCOVER messages on that interface, as per ISC DHCP server behavior. In real-world scenarios, this often occurs when a new VLAN is added but the corresponding subnet block is not defined in dhcpd.conf, causing silent packet drops at the server level.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
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FAQ
Network Client Management — This question tests Network Client Management — Read the scenario before looking for a memorised answer..
The correct answer is: subnet declaration — The DHCP server logs show no client activity, meaning the server is not receiving DHCPDISCOVER packets from the client. The most likely missing configuration is a subnet declaration, which defines the network segment the DHCP server should listen on and allocate addresses from. Without a matching subnet declaration in the DHCP configuration (e.g., /etc/dhcp/dhcpd.conf), the server will ignore requests from that subnet, even if the physical cable is connected.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This LPIC-2 practice question is part of Courseiva's free LPI 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 LPIC-2 exam.
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