LPIC-2 Advanced Networking Configuration Practice Question
This LPIC-2 practice question tests your understanding of advanced networking configuration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Refer to the exhibit.
# ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:11:22:33:44:55 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.100/24 brd 192.168.1.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::211:22ff:fe33:4455/64 scope link
valid_lft forever preferred_lft forever
Which command would add the default gateway 192.168.1.1 to this interface?
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.
Refer to the exhibit.
# ip addr show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:11:22:33:44:55 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.100/24 brd 192.168.1.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::211:22ff:fe33:4455/64 scope link
valid_lft forever preferred_lft forever
A
ip route add 0.0.0.0/0 via 192.168.1.1 dev eth0
Why wrong: Correct syntax but less common; 'default' is preferred.
B
ip route add default via 192.168.1.1 dev eth0
Standard iproute2 command with dev specified.
C
route add default gw 192.168.1.1
Why wrong: Deprecated route command; works but not modern.
D
ip route add default via 192.168.1.1
Why wrong: Missing dev eth0; if multiple default routes, may conflict.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ip route add default via 192.168.1.1 dev eth0
Option B is correct because the `ip route add default via 192.168.1.1 dev eth0` command explicitly specifies both the gateway address and the outgoing interface, which is necessary when multiple interfaces exist or when the kernel needs to resolve the next-hop without ambiguity. The `default` keyword is a shorthand for `0.0.0.0/0` in IPv4, and the `dev eth0` clause ensures the route is bound to the correct interface.
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.
✗
ip route add 0.0.0.0/0 via 192.168.1.1 dev eth0
Why it's wrong here
Correct syntax but less common; 'default' is preferred.
✓
ip route add default via 192.168.1.1 dev eth0
Why this is correct
Standard iproute2 command with dev specified.
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.
✗
route add default gw 192.168.1.1
Why it's wrong here
Deprecated route command; works but not modern.
✗
ip route add default via 192.168.1.1
Why it's wrong here
Missing dev eth0; if multiple default routes, may conflict.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose the legacy `route` command (Option C) out of habit, forgetting that the modern `ip` command is required for LPIC-2 exams, and they may overlook the necessity of specifying the interface (`dev eth0`) to avoid ambiguous routing when multiple network interfaces are present.
Trap categories for this question
Command / output trap
Deprecated route command; works but not modern.
Detailed technical explanation
How to think about this question
The `ip route` command from the iproute2 suite manipulates the kernel's routing table (FIB). When adding a default route, the `dev` parameter is critical because the kernel performs a neighbor lookup (ARP/ND) on the specified interface to resolve the next-hop MAC address; without it, the kernel may use an incorrect interface or fail if the gateway is not directly connected. In real-world scenarios, such as multi-homed servers or containers, omitting `dev` can cause asymmetric routing or black-hole 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 practitioner preparing for the LPIC-2 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: ip route add default via 192.168.1.1 dev eth0 — Option B is correct because the `ip route add default via 192.168.1.1 dev eth0` command explicitly specifies both the gateway address and the outgoing interface, which is necessary when multiple interfaces exist or when the kernel needs to resolve the next-hop without ambiguity. The `default` keyword is a shorthand for `0.0.0.0/0` in IPv4, and the `dev eth0` clause ensures the route is bound to the correct interface.
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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