Question 79 of 514

Routing Fundamentals →easyMultiple ChoiceObjective-mapped

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.

An administrator configures a static route to 192.168.2.0/24 with next-hop 10.0.0.1. The route does not appear in the routing table. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The next-hop 10.0.0.1 is not reachable.
A static route is only installed if the next-hop is reachable via an active route.
B
The static route has a higher preference than an existing dynamic route.
Why wrong: Static routes have a default preference of 5, which is lower than most dynamic routes, so they would be preferred.
C
The configuration was not committed.
Why wrong: If not committed, the route would not appear, but a commit would be required; the question implies it was configured but not shown.
D
The prefix 192.168.2.0/24 already exists in the forwarding table.
Why wrong: A different route to the same prefix would cause the route to be hidden, but the issue is likely next-hop reachability.

Full breakdown with real-world context →

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

✓

The next-hop 10.0.0.1 is not reachable.

A static route will only be installed in the routing table if the next-hop address is reachable via an active route in the routing table. If 10.0.0.1 is not reachable (e.g., no route to that subnet, or the interface is down), Junos will reject the static route and not place it in the inet.0 table. This is a fundamental validation check in Junos that prevents black-hole routing.

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 next-hop 10.0.0.1 is not reachable.
Why this is correct
A static route is only installed if the next-hop is reachable via an active route.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The static route has a higher preference than an existing dynamic route.
Why it's wrong here
Static routes have a default preference of 5, which is lower than most dynamic routes, so they would be preferred.
✗
The configuration was not committed.
Why it's wrong here
If not committed, the route would not appear, but a commit would be required; the question implies it was configured but not shown.
✗
The prefix 192.168.2.0/24 already exists in the forwarding table.
Why it's wrong here
A different route to the same prefix would cause the route to be hidden, but the issue is likely next-hop reachability.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume a static route is always installed immediately after configuration, forgetting that Junos requires the next-hop to be reachable via an existing route in the routing table before the static route becomes active.

Trap categories for this question

Command / output trap
If not committed, the route would not appear, but a commit would be required; the question implies it was configured but not shown.

Detailed technical explanation

How to think about this question

Junos uses a next-hop resolution mechanism where a static route's next-hop must be recursively resolved to a directly connected next-hop (e.g., an interface address). If the next-hop 10.0.0.1 is not in the routing table (no active route to 10.0.0.0/24 or similar), the static route is placed in a 'hidden' state and can be seen with 'show route protocol static hidden'. This behavior is defined in RFC 4271 and Junos implementation ensures that only routes with resolvable next-hops are active, preventing forwarding loops.

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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.

Visual reference

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.

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FAQ

Questions learners often ask

What does this JNCIA-JUNOS question test?

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 10.0.0.1 is not reachable. — A static route will only be installed in the routing table if the next-hop address is reachable via an active route in the routing table. If 10.0.0.1 is not reachable (e.g., no route to that subnet, or the interface is down), Junos will reject the static route and not place it in the inet.0 table. This is a fundamental validation check in Junos that prevents black-hole routing.

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.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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This JNCIA-JUNOS practice question is part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the JNCIA-JUNOS exam.