LPIC-2 Advanced Networking Configuration Practice Question
This LPIC-2 practice question tests your understanding of advanced networking configuration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company's Linux router uses iptables. The administrator needs to log all dropped packets (by default policy) before they are dropped. Where should the LOG rule be placed?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
In the FORWARD chain with -j LOG --log-prefix 'DROPPED' and then -j DROP
Option D is correct because the LOG rule must be placed in the FORWARD chain before the DROP action to log packets that are dropped by the default policy. In iptables, the LOG target does not terminate the rule; it logs the packet and then continues to the next rule. By placing `-j LOG --log-prefix 'DROPPED'` followed by `-j DROP`, the packet is logged before being explicitly dropped, ensuring that packets matching the default policy (which drops at the end of the chain) are captured in the log. The FORWARD chain is the correct chain for a router handling traffic that is not destined for the router itself.
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.
✗
In the FORWARD chain with target LOG
Why it's wrong here
Only logs, does not drop; packets would still be accepted by default policy.
✗
In the INPUT chain before the drop rule
Why it's wrong here
Does not address FORWARD chain; default drop policy still not logged.
✗
In a custom chain called LOGDROP and jump to it
Why it's wrong here
Custom chain must be called; still need LOG and DROP rules and proper placement.
✓
In the FORWARD chain with -j LOG --log-prefix 'DROPPED' and then -j DROP
Why this is correct
Logs and then explicitly drops packets that reached end of chain, emulating default policy for logging.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think the LOG rule must be placed in the INPUT chain (for incoming traffic) or that a custom chain is required, but the correct placement is in the FORWARD chain with an explicit DROP action after the LOG to ensure logging before the default policy drop.
Detailed technical explanation
How to think about this question
Under the hood, iptables chains are traversed sequentially; the default policy is applied only after all rules in the chain have been evaluated without a match. By placing a LOG rule before the DROP rule, you ensure that packets that would be dropped by the default policy are logged before the chain's final action. In real-world scenarios, this is critical for debugging firewall rules or auditing dropped traffic, as the default policy drop is silent without explicit logging. Note that the LOG target uses the kernel's syslog facility (usually /var/log/messages or /var/log/syslog) and can generate high log volumes if not rate-limited.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: In the FORWARD chain with -j LOG --log-prefix 'DROPPED' and then -j DROP — Option D is correct because the LOG rule must be placed in the FORWARD chain before the DROP action to log packets that are dropped by the default policy. In iptables, the LOG target does not terminate the rule; it logs the packet and then continues to the next rule. By placing `-j LOG --log-prefix 'DROPPED'` followed by `-j DROP`, the packet is logged before being explicitly dropped, ensuring that packets matching the default policy (which drops at the end of the chain) are captured in the log. The FORWARD chain is the correct chain for a router handling traffic that is not destined for the router itself.
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.
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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