- A
The `commit confirmed` command saves the configuration permanently.
Why wrong: `commit confirmed` makes a temporary commit that reverts automatically if not confirmed.
- B
The pipe character (|) can be used to filter command output.
This is a standard Junos CLI feature for filtering output.
- C
The `run` command allows operational mode commands to be executed from configuration mode.
The `run` prefix is used in configuration mode to execute operational commands.
- D
The `set cli screen-length 0` command disables command-line editing features.
Why wrong: This command disables paging, not editing features.
- E
The `rollback 0` command reverts to the previous committed configuration.
Why wrong: `rollback 0` loads the current active configuration; `rollback 1` loads the previous.
Quick Answer
The correct answers are that the pipe character filters output in operational mode, and the `run` command allows operational mode commands to be executed from configuration mode. The pipe is a fundamental Junos CLI basics tool that lets you refine command output by passing it through filters like `match`, `except`, or `count`, which is essential for efficient troubleshooting. The `run` command bridges the gap between configuration and operational modes, enabling you to verify changes without leaving configuration mode—a critical workflow for the JNCIA-Junos exam. This question tests your understanding of Juniper’s modal architecture, a common trap being confusion with `rollback 0`, which reverts to the current active configuration, not the previous one. Remember: `run` lets you “run around” in config mode, while the pipe is your “filter friend” for output.
JNCIA-JUNOS User Interfaces Practice Question
This JNCIA-JUNOS practice question tests your understanding of user interfaces. 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.
Which TWO statements about the Junos CLI are correct?
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 pipe character (|) can be used to filter command output.
Option A is correct because the pipe character filters output in operational mode. Option D is correct because the `run` command allows executing operational commands from configuration mode. Option B is wrong because `commit confirmed` requires a subsequent commit to make changes permanent. Option C is wrong because `rollback 0` reverts to the current active configuration, not the previous one. Option E is wrong because `set cli screen-length 0` disables paging, not command-line editing.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 `commit confirmed` command saves the configuration permanently.
Why it's wrong here
`commit confirmed` makes a temporary commit that reverts automatically if not confirmed.
- ✓
The pipe character (|) can be used to filter command output.
Why this is correct
This is a standard Junos CLI feature for filtering output.
Related concept
Authentication checks who the user is.
- ✓
The `run` command allows operational mode commands to be executed from configuration mode.
Why this is correct
The `run` prefix is used in configuration mode to execute operational commands.
Related concept
Authentication checks who the user is.
- ✗
The `set cli screen-length 0` command disables command-line editing features.
Why it's wrong here
This command disables paging, not editing features.
- ✗
The `rollback 0` command reverts to the previous committed configuration.
Why it's wrong here
`rollback 0` loads the current active configuration; `rollback 1` loads the previous.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Trap categories for this question
Command / output trap
This command disables paging, not editing features.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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. Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access. 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.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related JNCIA-JUNOS questions on access control and AAA configuration.
- →
User Interfaces — study guide chapter
Learn the concepts, then practise the questions
- →
User Interfaces practice questions
Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this JNCIA-JUNOS question test?
User Interfaces — This question tests User Interfaces — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The pipe character (|) can be used to filter command output. — Option A is correct because the pipe character filters output in operational mode. Option D is correct because the `run` command allows executing operational commands from configuration mode. Option B is wrong because `commit confirmed` requires a subsequent commit to make changes permanent. Option C is wrong because `rollback 0` reverts to the current active configuration, not the previous one. Option E is wrong because `set cli screen-length 0` disables paging, not command-line editing.
What should I do if I get this JNCIA-JUNOS question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related JNCIA-JUNOS questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Last reviewed: Jun 24, 2026
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