Quick Answer
The correct answer is `| lookup users.csv username AS user OUTPUT fullname AS full_name`. This syntax is correct because the `lookup` command first names the lookup file, then maps the lookup file's field (`username`) to the event's field (`user`) using `AS`, and finally uses `OUTPUT` to bring the `fullname` column into the event as a new field called `full_name`, effectively replacing the original `user` value with the full name. On the Splunk Core Certified User SPLK-1002 exam, this question tests your ability to distinguish between `lookup` and `inputlookup`, and a common trap is forgetting the `AS` mapping or placing `OUTPUT` before the field-to-field mapping. Remember the order: file, then field mapping with AS, then OUTPUT for the result. A helpful memory tip is "File, Map, Output" — think of it as telling Splunk where to look, how to connect the fields, and what to bring back.
This SPLK-1002 practice question tests your understanding of using fields and lookups. 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.
A search needs to replace a field value 'user' with 'full name' using a CSV lookup that has 'username' and 'fullname' columns. Which lookup command is correct?
| lookup users.csv username AS user OUTPUTNEW fullname
Why wrong: OUTPUTNEW overwrites existing, but 'full_name' is new field.
| lookup users.csv user AS username OUTPUT fullname
Why wrong: Matching direction reversed.
| lookup users.csv username AS user OUTPUT fullname AS full_name
Correctly matches user to username and outputs fullname as full_name.
| lookup users.csv user AS fullname OUTPUT username
Why wrong: Outputs the wrong field.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
| lookup users.csv username AS user OUTPUT fullname AS full_name
Option C is correct because the `lookup` command syntax requires specifying the lookup file, then the field name in the lookup file (`username`) mapped to the field in the event (`user`) using `AS`, and then `OUTPUT` to bring the `fullname` field into the event as a new field named `full_name`. This matches the requirement to replace the field value 'user' with 'full name' by using the CSV lookup's `fullname` column.
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.
| lookup users.csv username AS user OUTPUTNEW fullname
Why it's wrong here
OUTPUTNEW overwrites existing, but 'full_name' is new field.
| lookup users.csv user AS username OUTPUT fullname
Why it's wrong here
Matching direction reversed.
| lookup users.csv username AS user OUTPUT fullname AS full_name
Why this is correct
Correctly matches user to username and outputs fullname as full_name.
Related concept
Read the scenario before looking for a memorised answer.
| lookup users.csv user AS fullname OUTPUT username
Why it's wrong here
Outputs the wrong field.
Common exam traps
Splunk often tests the exact syntax of the `lookup` command, specifically the order of fields in the `AS` mapping and the difference between `OUTPUT` and `OUTPUTNEW`, causing candidates to confuse which side of `AS` represents the lookup file column versus the event field.
Trap categories for this question
Command / output trap
OUTPUTNEW overwrites existing, but 'full_name' is new field.
Detailed technical explanation
The `lookup` command in Splunk uses a left-to-right mapping: the field name before `AS` is the lookup file's column, and the field name after `AS` is the event field. The `OUTPUT` clause can optionally rename the output field using `AS` (e.g., `OUTPUT fullname AS full_name`). Under the hood, Splunk performs a key-value match on the specified fields and appends the output fields to the event, which is critical for enriching data without altering the original event structure unless explicitly renamed.
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 SPLK-1002 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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Using Fields and Lookups — study guide chapter
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FAQ
Using Fields and Lookups — This question tests Using Fields and Lookups — Read the scenario before looking for a memorised answer..
The correct answer is: | lookup users.csv username AS user OUTPUT fullname AS full_name — Option C is correct because the `lookup` command syntax requires specifying the lookup file, then the field name in the lookup file (`username`) mapped to the field in the event (`user`) using `AS`, and then `OUTPUT` to bring the `fullname` field into the event as a new field named `full_name`. This matches the requirement to replace the field value 'user' with 'full name' by using the CSV lookup's `fullname` column.
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.
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Last reviewed: Jun 30, 2026
This SPLK-1002 practice question is part of Courseiva's free Splunk 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 SPLK-1002 exam.
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