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 network administrator is configuring source-based routing. They have created a new routing table and added a default route. They then run: ip rule add to 10.0.0.0/24 lookup 100. Traffic from 10.0.0.0/24 still uses the main table. What is the problem?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The rule uses 'to' instead of 'from' to match the source subnet.
The `ip rule add to 10.0.0.0/24 lookup 100` command uses the `to` keyword, which matches the destination address, not the source address. For source-based routing, you must use the `from` keyword to match the source subnet. Since the rule matches destination 10.0.0.0/24 instead of source, traffic originating from 10.0.0.0/24 is not matched by this rule and continues to use the main routing table.
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.
✓
The rule uses 'to' instead of 'from' to match the source subnet.
Why this is correct
For source-based routing, the rule should specify 'from' to match the source address. Using 'to' matches the destination.
Related concept
Read the scenario before looking for a memorised answer.
✗
The rule is not persistent.
Why it's wrong here
Persistence affects reboot behavior, not immediate application.
✗
The rule priority is too high.
Why it's wrong here
Priority is optional and not the cause; even without explicit priority, the rule should apply if it matches.
✗
The routing table 100 does not have a default route.
Why it's wrong here
The table has a default route, so that is not the issue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the `to` and `from` keywords in `ip rule`, mistakenly thinking `to` refers to the source subnet when it actually refers to the destination, leading them to select a rule that never matches the intended traffic.
Detailed technical explanation
How to think about this question
In Linux policy routing, the `ip rule` command uses `from` to match the source IP address and `to` to match the destination IP address. The rule is evaluated against packet attributes; if the `to` keyword is used, only packets destined for 10.0.0.0/24 are matched, not packets sourced from that subnet. A real-world scenario is when an administrator wants to route outbound traffic from a specific source subnet through a different gateway (e.g., for VPN or multi-homing), which requires `from` to match the source.
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: The rule uses 'to' instead of 'from' to match the source subnet. — The `ip rule add to 10.0.0.0/24 lookup 100` command uses the `to` keyword, which matches the destination address, not the source address. For source-based routing, you must use the `from` keyword to match the source subnet. Since the rule matches destination 10.0.0.0/24 instead of source, traffic originating from 10.0.0.0/24 is not matched by this rule and continues to use the main routing table.
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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