LPIC-2 Advanced Networking Configuration Practice Question
A Linux router running multiple routing tables is misconfigured. The administrator wants to add a policy routing rule that sends all traffic from subnet 10.10.0.0/16 to routing table 200. Which command should be used?
⚠ Common exam trap
Test-takers frequently confuse adding a route to a table (ip route add ... table 200) with creating a policy rule that directs traffic to that table (ip rule add ... table 200), leading them to pick option D instead of B.
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
✓
ip rule add from 10.10.0.0/16 table 200
The `ip rule` command is used to add policy routing rules in Linux, which direct packets to specific routing tables based on criteria like source address. The `from` parameter specifies the source subnet (10.10.0.0/16), and `table 200` directs matching traffic to routing table 200, enabling policy-based routing beyond the default table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
route add -net 10.10.0.0/16 table 200
Why it's wrong here
'route' command does not support multiple tables.
- ✓
ip rule add from 10.10.0.0/16 table 200
Why this is correct
Creates a routing policy rule based on source address.
- ✗
iptables -A FORWARD -s 10.10.0.0/16 -j table 200
Why it's wrong here
iptables cannot add routing table entries.
- ✗
ip route add 10.10.0.0/16 dev eth0 table 200
Why it's wrong here
Adds a route to table 200, not a rule to select that table.
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Written by Johnson Ajibi, MSc IT Security
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