Quick Answer
The answer is except, match, and count. These three Junos CLI pipe modifiers are correct because they each filter or transform command output in a distinct way: the match modifier displays only lines containing a specified regular expression, the except modifier does the opposite by excluding lines that match a pattern, and the count modifier provides a numeric summary of the total lines instead of displaying the actual output. On the JNCIA-Junos exam, this question tests your ability to distinguish between pipe modifiers that genuinely filter output versus those that simply reformat it, such as display set or display detail. A common trap is confusing count with a filter—remember that count does not show lines but still filters by summarizing them. For a quick memory tip, think of the three Fs: Find (match), Forget (except), and Figure (count).
This JNCIA-JUNOS practice question tests your understanding of user interfaces. 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 THREE pipe modifiers can be used to filter command output? (Choose three.)
no-more
Why wrong: Disables paging, not a filter.
count
Counts the number of lines in the output.
display set
Why wrong: Changes output format, not a filter.
match
Displays lines that match a regular expression.
except
Displays lines that do not match a regular expression.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
count
Option B is correct because the 'count' pipe modifier in Junos counts the number of lines in the command output, effectively filtering by providing a numeric summary rather than displaying the actual lines. This is a valid pipe modifier used to filter or transform command output in the Junos CLI.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
no-more
Why it's wrong here
Disables paging, not a filter.
count
Why this is correct
Counts the number of lines in the output.
Related concept
Read the scenario before looking for a memorised answer.
display set
Why it's wrong here
Changes output format, not a filter.
match
Why this is correct
Displays lines that match a regular expression.
Related concept
Read the scenario before looking for a memorised answer.
except
Why this is correct
Displays lines that do not match a regular expression.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse pipe modifiers that change display behavior (like 'no-more' or 'display set') with those that actually filter the output content, leading them to select 'no-more' as a filtering modifier when it only controls pagination.
Trap categories for this question
Command / output trap
Changes output format, not a filter.
Detailed technical explanation
Pipe modifiers in Junos are processed by the CLI's output pipeline, which can filter, count, or transform the output before it is displayed. The 'count' modifier uses a line-counting mechanism that is independent of the command's normal output, making it useful for quickly determining the number of matching entries (e.g., 'show interfaces terse | count' returns only the line count). In contrast, 'match' and 'except' use regular expression pattern matching to include or exclude lines, respectively, and are commonly used to narrow down large outputs like routing tables or log files.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
User Interfaces — This question tests User Interfaces — Read the scenario before looking for a memorised answer..
The correct answer is: count — Option B is correct because the 'count' pipe modifier in Junos counts the number of lines in the command output, effectively filtering by providing a numeric summary rather than displaying the actual lines. This is a valid pipe modifier used to filter or transform command output in the Junos CLI.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
About these practice questions
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO statements are true regarding the Junos CLI? (Choose two.)
mediumWhy A: Option A is correct because the pipe (|) in the Junos CLI is used to filter command output, allowing you to apply modifiers like 'match', 'except', 'count', or 'display set' to refine the displayed information. This is a fundamental feature for efficiently managing large amounts of operational or configuration data.
Last reviewed: Jun 24, 2026
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