LPIC-2 Advanced Networking Configuration Practice Question
This LPIC-2 practice question tests your understanding of advanced networking configuration. 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.
An administrator configures a DHCP relay agent using 'dhcrelay' in a network with multiple VLANs. The relay agent is on a Linux server with interfaces eth0 (VLAN 10) and eth1 (VLAN 20). The DHCP server is on VLAN 10. Which command correctly sets up the relay to forward requests from VLAN 20 to the DHCP server at 192.168.1.5?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Why wrong: This listens on eth0 (server side), so client requests from VLAN 20 will not be received.
B
dhcrelay -i eth1 192.168.1.5
Listens on eth1 (VLAN 20) and relays to the DHCP server at 192.168.1.5.
C
dhcrelay -i eth0 -i eth1 192.168.1.5
Why wrong: This listens on both interfaces, but the server is on eth0, so relaying from eth0 is unnecessary.
D
dhcrelay 192.168.1.5
Why wrong: Without -i, dhcrelay listens on all interfaces, which may cause unintended behavior but technically could work; however, it is not best practice.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
dhcrelay -i eth1 192.168.1.5
Option B is correct because the `-i eth1` flag specifies the interface on which the relay agent should listen for DHCP client broadcasts (VLAN 20). The relay then unicasts those requests to the DHCP server at 192.168.1.5, which resides on VLAN 10. This ensures that only broadcasts from the client-side VLAN are forwarded, not those from the server-side network.
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.
✗
dhcrelay -i eth0 192.168.1.5
Why it's wrong here
This listens on eth0 (server side), so client requests from VLAN 20 will not be received.
✓
dhcrelay -i eth1 192.168.1.5
Why this is correct
Listens on eth1 (VLAN 20) and relays to the DHCP server at 192.168.1.5.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
dhcrelay -i eth0 -i eth1 192.168.1.5
Why it's wrong here
This listens on both interfaces, but the server is on eth0, so relaying from eth0 is unnecessary.
✗
dhcrelay 192.168.1.5
Why it's wrong here
Without -i, dhcrelay listens on all interfaces, which may cause unintended behavior but technically could work; however, it is not best practice.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the relay must listen on the server-side interface (eth0) or on all interfaces, not realizing that the `-i` flag specifies the client-facing interface where broadcasts originate.
Detailed technical explanation
How to think about this question
The DHCP relay agent (dhcrelay) implements RFC 1542, intercepting DHCPDISCOVER broadcasts on the specified interface and unicasting them to the configured server using the giaddr (gateway IP address) field. In multi-VLAN setups, the relay must be placed on the client subnet (VLAN 20) to receive the broadcast; it then rewrites the giaddr with its own IP on that interface so the server knows which subnet to offer an address from. A common real-world pitfall is forgetting that the relay agent itself must have an IP address on the client VLAN for the giaddr to be set correctly.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Advanced Networking Configuration — This question tests Advanced Networking Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: dhcrelay -i eth1 192.168.1.5 — Option B is correct because the `-i eth1` flag specifies the interface on which the relay agent should listen for DHCP client broadcasts (VLAN 20). The relay then unicasts those requests to the DHCP server at 192.168.1.5, which resides on VLAN 10. This ensures that only broadcasts from the client-side VLAN are forwarded, not those from the server-side network.
What should I do if I get this LPIC-2 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: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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