JNCIA-JUNOS Routing Fundamentals Practice Question
This JNCIA-JUNOS practice question tests your understanding of routing fundamentals. 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
show route 10.1.1.0/24
inet.0: 10 destinations, 12 routes (10 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
10.1.1.0/24 *[Direct/0] 1d 02:00:00, metric 0
> via ge-0/0/1.0
[OSPF/10] 1d 02:00:00, metric 2
> to 10.2.2.2 via ge-0/0/0.0
[Static/10] 1d 02:00:00, metric 0
to 10.3.3.3 via ge-0/0/2.0
Refer to the exhibit. How many active routes exist for 10.1.1.0/24?
Exhibit
show route 10.1.1.0/24
inet.0: 10 destinations, 12 routes (10 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
10.1.1.0/24 *[Direct/0] 1d 02:00:00, metric 0
> via ge-0/0/1.0
[OSPF/10] 1d 02:00:00, metric 2
> to 10.2.2.2 via ge-0/0/0.0
[Static/10] 1d 02:00:00, metric 0
to 10.3.3.3 via ge-0/0/2.0
A
1
Only the direct route is active, indicated by the asterisk.
B
2
Why wrong: Only one route is marked active, not two.
C
0
Why wrong: There is an active route, as shown.
D
3
Why wrong: There are three routes total, but only one is active.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
1
The route 10.1.1.0/24 appears in the routing table with a next-hop of 192.168.1.1 and a preference of 5 (directly connected). Only one active route is present because the routing table shows a single entry for this prefix. Junos selects the active route based on the lowest preference value; here, there is no competing route, so only one route is active.
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.
✓
1
Why this is correct
Only the direct route is active, indicated by the asterisk.
Related concept
Read the scenario before looking for a memorised answer.
✗
2
Why it's wrong here
Only one route is marked active, not two.
✗
0
Why it's wrong here
There is an active route, as shown.
✗
3
Why it's wrong here
There are three routes total, but only one is active.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may count multiple routes for the same prefix if they see multiple next-hops or paths in the output, but Junos only considers the route with the lowest preference as active, and the question specifically asks for active routes, not all routes in the table.
Trap categories for this question
Command / output trap
There is an active route, as shown.
Detailed technical explanation
How to think about this question
In Junos, the routing table (inet.0) stores all routes, but only the route with the lowest preference (administrative distance) is installed as active. For directly connected routes, the preference is 0 (or 5 in some configurations), and they are always preferred over static or dynamic routes unless overridden. The 'active route' count in the output of 'show route 10.1.1.0/24' reflects only the route that is used for forwarding, not all possible paths.
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: 1 — The route 10.1.1.0/24 appears in the routing table with a next-hop of 192.168.1.1 and a preference of 5 (directly connected). Only one active route is present because the routing table shows a single entry for this prefix. Junos selects the active route based on the lowest preference value; here, there is no competing route, so only one route is active.
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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