The answer is that the lookup definition is configured for case-sensitive matching, which causes the lookup to return null for myfield2 even when matching entries exist in the file. This happens because Splunk’s lookup mechanism includes a case-sensitivity setting; by default, lookups are case-insensitive, but when the definition is explicitly set to case-sensitive, the lookup will only succeed if the event field value’s case exactly matches the case in the lookup file. On the SPLK-1002 exam, this question tests your understanding of lookup configuration nuances, often appearing as a trap where candidates assume a matching value guarantees output. A common memory tip is to remember that “case-sensitive lookups demand exact letter-for-letter matches, so a mismatch in uppercase vs. lowercase yields null.”
SPLK-1002 Using Fields and Lookups Practice Question
This SPLK-1002 practice question tests your understanding of using fields and lookups. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 user runs a search and uses `| lookup mylookup myfield OUTPUT myfield2`. The search returns events that have myfield values, but myfield2 is null. The lookup file has matching entries. What is the most likely issue?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The lookup definition is case-sensitive and the event values have different case.
Option A is correct because the lookup definition in Splunk has a case-sensitivity setting. By default, lookups are case-insensitive, but if the lookup definition is configured to be case-sensitive, then the lookup will only match when the case of the event field value exactly matches the case in the lookup file. Since the events have myfield values but myfield2 is null, the lookup is failing to match due to case differences, even though the lookup file has matching entries.
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 lookup definition is case-sensitive and the event values have different case.
Why this is correct
Case mismatch prevents matching.
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 lookup definition is missing the max_matches setting.
Why it's wrong here
Missing max_matches defaults to 1, not null.
✗
The lookup file has duplicate keys.
Why it's wrong here
Duplicates would not cause null; they might cause multiple matches.
✗
The lookup command should use OUTPUTNEW instead of OUTPUT.
Why it's wrong here
OUTPUTNEW only applies if field already exists; null is not from overwrite.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Splunk often tests the nuance between case-sensitive and case-insensitive lookups, and the trap here is that candidates assume lookups are always case-insensitive by default, forgetting that the lookup definition can be explicitly configured for case-sensitive matching.
Trap categories for this question
Command / output trap
OUTPUTNEW only applies if field already exists; null is not from overwrite.
Detailed technical explanation
How to think about this question
Under the hood, Splunk's lookup command uses the lookup table definition's case_sensitive_match attribute. When set to true, the lookup performs a binary comparison of field values, so 'ABC' and 'abc' are treated as different. In real-world scenarios, this often catches users who import CSV files with mixed-case data or who have event data from different sources with inconsistent casing, leading to silent lookup failures.
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 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
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.
Using Fields and Lookups — This question tests Using Fields and Lookups — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The lookup definition is case-sensitive and the event values have different case. — Option A is correct because the lookup definition in Splunk has a case-sensitivity setting. By default, lookups are case-insensitive, but if the lookup definition is configured to be case-sensitive, then the lookup will only match when the case of the event field value exactly matches the case in the lookup file. Since the events have myfield values but myfield2 is null, the lookup is failing to match due to case differences, even though the lookup file has matching entries.
What should I do if I get this SPLK-1002 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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Question Discussion
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