- A
Use iptables to mark packets from the development subnet and then use ip rule to use the main table for marked packets.
Why wrong: Packet marking is not necessary; using ip rule with 'from' selector is simpler. Also, using main table is not isolating the traffic.
- B
Add an ip rule to route traffic from 192.168.10.0/24 to the firewall without creating a new table.
Why wrong: An ip rule must reference a routing table; without a table, the rule is incomplete.
- C
Add a static route to the main routing table for 192.168.10.0/24 pointing to the firewall.
Why wrong: This modifies the main table, affecting all traffic destined to that subnet, not policy routing.
- D
Create a new routing table (e.g., table 100), add a default route via the firewall in that table, and add an ip rule to use table 100 for traffic from 192.168.10.0/24.
This correctly implements policy-based routing by using a separate routing table and a rule.
Quick Answer
The answer is to create a new routing table (e.g., table 100), add a default route via the firewall in that table, and add an ip rule to use table 100 for traffic from 192.168.10.0/24. This is correct because policy-based routing with iproute2 overrides the kernel’s default destination-based routing by matching traffic on attributes like source subnet; the ip rule selects the packet, and the custom routing table then provides an alternate default gateway, allowing the development subnet to bypass the main routing table. On the LPIC-2 exam, this tests your understanding of the ip rule and ip route commands under Topic 212.1, often appearing as a scenario where you must isolate traffic for security or load balancing. A common trap is forgetting that the rule must reference the custom table by number, not by name. Memory tip: “Rule selects, table directs”—the rule matches the source, and the table holds the special default route.
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 has multiple subnets and wants to implement policy-based routing to direct traffic from a specific development subnet (192.168.10.0/24) through a specialized firewall for content filtering, while all other traffic uses the default gateway. Which of the following steps is required to achieve this using iproute2 tools?
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
Create a new routing table (e.g., table 100), add a default route via the firewall in that table, and add an ip rule to use table 100 for traffic from 192.168.10.0/24.
Option D is correct because policy-based routing (PBR) with iproute2 requires creating a separate routing table, adding a default route via the firewall in that table, and then using an ip rule to match traffic from the source subnet (192.168.10.0/24) and direct it to that custom table. This allows traffic from the development subnet to follow a different path than the default gateway, while all other traffic 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.
- ✗
Use iptables to mark packets from the development subnet and then use ip rule to use the main table for marked packets.
Why it's wrong here
Packet marking is not necessary; using ip rule with 'from' selector is simpler. Also, using main table is not isolating the traffic.
- ✗
Add an ip rule to route traffic from 192.168.10.0/24 to the firewall without creating a new table.
Why it's wrong here
An ip rule must reference a routing table; without a table, the rule is incomplete.
- ✗
Add a static route to the main routing table for 192.168.10.0/24 pointing to the firewall.
Why it's wrong here
This modifies the main table, affecting all traffic destined to that subnet, not policy routing.
- ✓
Create a new routing table (e.g., table 100), add a default route via the firewall in that table, and add an ip rule to use table 100 for traffic from 192.168.10.0/24.
Why this is correct
This correctly implements policy-based routing by using a separate routing table and a rule.
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 confuse destination-based static routing (which affects where traffic goes) with source-based policy routing (which affects how traffic leaves), leading them to choose Option C or B instead of recognizing the need for a separate routing table and ip rule.
Detailed technical explanation
How to think about this question
Under the hood, the Linux kernel uses a Routing Policy Database (RPDB) managed by `ip rule`; each rule has a priority and can match on source address, fwmark, or other selectors, then direct lookup to a specific routing table (e.g., table 100). The custom table must contain a default route via the firewall, while the main table retains the default gateway; this separation ensures that only matched traffic uses the firewall path. In real-world scenarios, this is commonly used to force guest or development VLAN traffic through a content filter without affecting production traffic.
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.
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FAQ
Questions learners often ask
What does this LPIC-2 question test?
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: Create a new routing table (e.g., table 100), add a default route via the firewall in that table, and add an ip rule to use table 100 for traffic from 192.168.10.0/24. — Option D is correct because policy-based routing (PBR) with iproute2 requires creating a separate routing table, adding a default route via the firewall in that table, and then using an ip rule to match traffic from the source subnet (192.168.10.0/24) and direct it to that custom table. This allows traffic from the development subnet to follow a different path than the default gateway, while all other traffic 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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Last reviewed: Jun 11, 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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