JNCIA-JUNOS Routing Fundamentals Practice Question
This JNCIA-JUNOS practice question tests your understanding of routing fundamentals. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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
[edit]
user@router# run show route 10.10.20.0/24
inet.0: 5 destinations, 5 routes (4 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
10.10.20.0/24 [Static/5] 00:01:00
to 10.10.10.1 via ge-0/0/0.0
(No active path)
user@router# run show route 10.10.10.1
{master:0}
user@router#
Refer to the exhibit. Why is the static route not active?
Exhibit
[edit]
user@router# run show route 10.10.20.0/24
inet.0: 5 destinations, 5 routes (4 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
10.10.20.0/24 [Static/5] 00:01:00
to 10.10.10.1 via ge-0/0/0.0
(No active path)
user@router# run show route 10.10.10.1
{master:0}
user@router#
A
The static route has a high preference.
Why wrong: The preference is 5, which is low and should be preferred.
B
The outbound interface is not up.
Why wrong: The interface ge-0/0/0.0 is listed in the route entry, suggesting it is operational.
C
The static route is not committed.
Why wrong: The route is present in the routing table, so it is committed.
D
The next-hop address is not reachable in the routing table.
The show route command for 10.10.10.1 returns no output, indicating the next-hop is unknown.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The next-hop address is not reachable in the routing table.
Option D is correct because for a static route to be active in the JUNOS routing table, the next-hop address must be reachable via an active route in the routing table. If the next-hop is not reachable, the static route is considered invalid and will not be installed as active, even if the outbound interface is up and the configuration is committed.
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 static route has a high preference.
Why it's wrong here
The preference is 5, which is low and should be preferred.
✗
The outbound interface is not up.
Why it's wrong here
The interface ge-0/0/0.0 is listed in the route entry, suggesting it is operational.
✗
The static route is not committed.
Why it's wrong here
The route is present in the routing table, so it is committed.
✓
The next-hop address is not reachable in the routing table.
Why this is correct
The show route command for 10.10.10.1 returns no output, indicating the next-hop is unknown.
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 assume a static route is always active once configured and committed, forgetting that JUNOS requires the next-hop to be reachable in the routing table for the route to be installed.
Detailed technical explanation
How to think about this question
In JUNOS, a static route with a next-hop address is only installed in the routing table if the next-hop is reachable via an existing route (e.g., a directly connected or learned route). This is validated by the routing protocol process (rpd) performing a recursive lookup. If the next-hop is not reachable, the static route remains hidden (not active) and will not be used for forwarding, which is a common cause of connectivity issues in networks with incomplete routing information.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Routing Fundamentals — This question tests Routing Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The next-hop address is not reachable in the routing table. — Option D is correct because for a static route to be active in the JUNOS routing table, the next-hop address must be reachable via an active route in the routing table. If the next-hop is not reachable, the static route is considered invalid and will not be installed as active, even if the outbound interface is up and the configuration is committed.
What should I do if I get this JNCIA-JUNOS 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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