- A
It has a prefix of 0.0.0.0/0
The default route matches all destinations.
- B
It can only be learned dynamically
Why wrong: It can be configured statically or learned via routing protocols.
- C
Its default preference is 0
Why wrong: The default preference for a static default route is 10, not 0.
- D
It can be added via a static route
Static route configuration can define a default route.
- E
It is always present in the routing table
Why wrong: The default route is present only if explicitly configured or learned.
Question 138 of 514
Understanding the Default Route in Junos
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.
Which TWO statements are true about the default route in JunOS? (Choose two.)
Quick Answer
The correct answer is that the default route in Junos can be added via a static route. This is because the default route is defined by the prefix 0.0.0.0/0, which matches any destination IP address not found in the routing table, and Junos allows you to configure this route statically using the `set routing-options static route 0.0.0.0/0 next-hop` command. On the JNCIA-Junos exam, this question tests your understanding of how Junos handles default routing, often appearing as a multiple-select trap where candidates mistakenly think the default route is always present or has a preference of 0. A common pitfall is confusing the static default route’s default preference of 5 (or 10 for a static route with a next-hop) with the preference of a direct interface route. Remember the memory tip: “Default is 0.0.0.0/0, static adds it, preference is not zero.”
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
✓
It has a prefix of 0.0.0.0/0
Option A is correct because the default route in JunOS is represented by the prefix 0.0.0.0/0, which matches any destination IP address. This is the standard IPv4 default route notation used in routing tables to forward packets when no more specific route exists.
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.
- ✓
It has a prefix of 0.0.0.0/0
Why this is correct
The default route matches all destinations.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
It can only be learned dynamically
Why it's wrong here
It can be configured statically or learned via routing protocols.
- ✗
Its default preference is 0
Why it's wrong here
The default preference for a static default route is 10, not 0.
- ✓
It can be added via a static route
Why this is correct
Static route configuration can define a default route.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
It is always present in the routing table
Why it's wrong here
The default route is present only if explicitly configured or learned.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the default route's prefix (0.0.0.0/0) with its preference, mistakenly thinking a default route has a preference of 0 like a directly connected route, or assuming it is always present in the routing table.
Detailed technical explanation
How to think about this question
In JunOS, the default route 0.0.0.0/0 can be added using 'set routing-options static route 0.0.0.0/0 next-hop <gateway>' and its preference defaults to 5 for static routes. Dynamic default routes from OSPF have a preference of 150, while BGP default routes have a preference of 170. The route is only present if explicitly configured or received, making it absent by default.
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.
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Routing Fundamentals — study guide chapter
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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: It has a prefix of 0.0.0.0/0 — Option A is correct because the default route in JunOS is represented by the prefix 0.0.0.0/0, which matches any destination IP address. This is the standard IPv4 default route notation used in routing tables to forward packets when no more specific route exists.
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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Last reviewed: Jul 4, 2026
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.
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