Quick Answer
The answer is to modify the lookup definition to set `case_sensitive_match = false`. This is correct because Splunk lookups are case-sensitive by default, meaning that when the firewall logs contain lowercase IP addresses and the `threat_intel.csv` lookup file stores them in uppercase, no matches occur even though the values are logically identical. The `case_sensitive_match = false` setting forces Splunk to ignore case during the match, directly resolving the mismatch without altering the raw data or the search command. On the SPLK-1002 exam, this scenario tests your understanding of lookup configuration details versus common pitfalls like assuming the `OUTPUTNEW` option or field order is the issue—the trap is that many candidates overlook the default case sensitivity. A solid memory tip is "case kills matches": if your lookup returns zero results despite correct field names and data, always check for case mismatches first, as Splunk treats "192.168.1.1" and "192.168.1.1" as different unless you explicitly disable case sensitivity.
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 company has a Splunk environment indexing firewall logs from multiple vendors. The security team wants to enrich events with a threat intelligence lookup that contains IP addresses and threat categories. The lookup file 'threat_intel.csv' has fields: ip, category, confidence. The admin runs the following search: index=firewall | lookup threat_intel.csv src_ip OUTPUT category confidence. However, the lookup returns no results, even though there are matching IPs. The admin verifies that the lookup file is uploaded and the field names are correct. What is the most likely cause? The admin suspects that the lookup is case-sensitive, but the IP addresses in the logs are lowercase and the lookup has uppercase. The admin also considers that the lookup might be configured with the wrong field order, or that the lookup command is missing the OUTPUTNEW option, or that the index name is wrong. Which course of action should the admin take first to resolve the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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.
Modify the lookup definition to set case_sensitive_match = false
This allows case-insensitive matching.
Swap the field order in the lookup command
Why wrong: Field order does not matter.
Change OUTPUT to OUTPUTNEW to avoid overwriting fields
Why wrong: Output options do not affect matching.
Change the index to default
Why wrong: Index is correct.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Modify the lookup definition to set case_sensitive_match = false
The most likely cause is that the lookup is case-sensitive by default, and the IP addresses in the logs are lowercase while the lookup file contains uppercase IPs. Setting `case_sensitive_match = false` in the lookup definition forces Splunk to ignore case when matching, which resolves the issue without altering the data or command structure.
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.
Modify the lookup definition to set case_sensitive_match = false
Why this is correct
This allows case-insensitive matching.
Clue confirmation
The clue words "first", "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Swap the field order in the lookup command
Why it's wrong here
Field order does not matter.
Change OUTPUT to OUTPUTNEW to avoid overwriting fields
Why it's wrong here
Output options do not affect matching.
Change the index to default
Why it's wrong here
Index is correct.
Common exam traps
The trap here is that candidates often assume the lookup command syntax is wrong (e.g., field order or OUTPUT vs OUTPUTNEW) when the real issue is a subtle default behavior like case sensitivity, which Splunk explicitly tests in the SPLK-1002 exam.
Trap categories for this question
Command / output trap
Output options do not affect matching.
Detailed technical explanation
By default, Splunk lookups perform case-sensitive matching on string fields. For IP addresses, which are often stored as strings in logs and lookups, a mismatch in case (e.g., '192.168.1.1' vs '192.168.1.1' — note that IPs are case-insensitive by nature, but Splunk treats them as literal strings) can cause zero results. Setting `case_sensitive_match = false` in the lookup definition (via Settings > Lookups > Lookup definitions) forces Splunk to use case-insensitive comparison, which is critical when data sources have inconsistent casing. This is a common issue when integrating threat intelligence feeds that may use uppercase hex or mixed-case representations.
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: Modify the lookup definition to set case_sensitive_match = false — The most likely cause is that the lookup is case-sensitive by default, and the IP addresses in the logs are lowercase while the lookup file contains uppercase IPs. Setting `case_sensitive_match = false` in the lookup definition forces Splunk to ignore case when matching, which resolves the issue without altering the data or command structure.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first", "most likely". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 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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