JNCIA-JUNOS Networking Fundamentals Practice Question
This JNCIA-JUNOS practice question tests your understanding of networking fundamentals. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 medium-sized enterprise has its headquarters (HQ) and a remote branch office connected via a dedicated point-to-point link. The HQ router (Juniper MX) has interface ge-0/0/1 with IP 10.0.0.1/30 connected to the branch router (Juniper SRX) interface ge-0/0/0 with IP 10.0.0.2/30. The branch LAN is 192.168.2.0/24, and the HQ LAN is 10.0.1.0/24. The branch router has a default route pointing to 10.0.0.1. The HQ router has a static route for 192.168.2.0/24 with next-hop 10.0.0.2, but it was recently changed incorrectly to point to 10.0.0.10 due to a configuration error. Users at the branch report that they can access the internet via the HQ router but cannot reach the HQ LAN's file server at 10.0.1.100. From the HQ router, you can ping the branch router's interface IP (10.0.0.2) successfully, but you cannot ping any device in the branch LAN (192.168.2.0/24). You check the routing table on the HQ router and see that the static route for 192.168.2.0/24 points to 10.0.0.10. What is the most appropriate corrective action?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Change the static route on the HQ router to point to 10.0.0.2.
Option A is correct. The incorrect static route on the HQ router is pointing to a nonexistent next-hop (10.0.0.10), so traffic to the branch LAN is not forwarded. Changing the next-hop to 10.0.0.2 (the branch router's interface) restores the route. Option B is unnecessary because the branch router's default route already covers the HQ LAN. Option C (proxy ARP) does not fix a routing table issue. Option D would remove the route entirely, breaking connectivity to the branch LAN.
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.
✗
Add a static route on the branch router for 10.0.1.0/24 pointing to 10.0.0.1.
Why it's wrong here
Incorrect. The branch router already has a default route that covers the HQ LAN.
✗
Remove the static route and rely on the default route on the branch router.
Why it's wrong here
Incorrect. Removing the static route leaves the HQ router without a route to the branch LAN.
✗
Enable proxy ARP on the HQ router's ge-0/0/1 interface.
Why it's wrong here
Incorrect. Proxy ARP does not resolve a missing or incorrect route in the routing table.
✓
Change the static route on the HQ router to point to 10.0.0.2.
Why this is correct
Correct. This corrects the next-hop to the branch router's interface, enabling reachability to the branch LAN.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 JNCIA-JUNOS 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 JNCIA-JUNOS exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Networking Fundamentals — This question tests Networking Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Change the static route on the HQ router to point to 10.0.0.2. — Option A is correct. The incorrect static route on the HQ router is pointing to a nonexistent next-hop (10.0.0.10), so traffic to the branch LAN is not forwarded. Changing the next-hop to 10.0.0.2 (the branch router's interface) restores the route. Option B is unnecessary because the branch router's default route already covers the HQ LAN. Option C (proxy ARP) does not fix a routing table issue. Option D would remove the route entirely, breaking connectivity to the branch LAN.
What should I do if I get this JNCIA-JUNOS question wrong?
Identify which JNCIA-JUNOS exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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