SPLK-1003 Transactions and Event Correlation Practice Question
This SPLK-1003 practice question tests your understanding of transactions and event correlation. 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.
Refer to the exhibit. A security analyst runs this search to group SSH login events into sessions based on a session_id that is extracted only from 'Accepted publickey' events. However, the resulting transactions contain only the 'Accepted publickey' event and none of the subsequent commands or logouts. What is the most likely cause?
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.
The maxpause=5m is too short, causing the transaction to close before other events occur.
Why wrong: Even if maxpause were longer, other events lack the session_id to join.
B
The session_id field is only populated for the 'Accepted publickey' event, so other events have a different or null session_id and do not join the transaction.
Only the start event gets a session_id; other events have null, so they are not grouped.
C
The transaction command requires that all events have a non-null session_id to be grouped.
Why wrong: Transaction groups events with the same session_id; null values are treated as a group, but only events with null session_id would group together.
D
The sourcetype filter is too restrictive.
Why wrong: The sourcetype is correctly set to linux_secure.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The session_id field is only populated for the 'Accepted publickey' event, so other events have a different or null session_id and do not join the transaction.
Option B is correct because the `transaction` command groups events by the `session_id` field. If `session_id` is only extracted from 'Accepted publickey' events (e.g., via a `rex` or `eval` command), subsequent commands and logout events will have a null or different `session_id`. Since `transaction` requires all events in the group to share the same `session_id` value, those other events cannot join the transaction, resulting in a transaction containing only the single 'Accepted publickey' event.
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 maxpause=5m is too short, causing the transaction to close before other events occur.
Why it's wrong here
Even if maxpause were longer, other events lack the session_id to join.
✓
The session_id field is only populated for the 'Accepted publickey' event, so other events have a different or null session_id and do not join the transaction.
Why this is correct
Only the start event gets a session_id; other events have null, so they are not grouped.
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 transaction command requires that all events have a non-null session_id to be grouped.
Why it's wrong here
Transaction groups events with the same session_id; null values are treated as a group, but only events with null session_id would group together.
✗
The sourcetype filter is too restrictive.
Why it's wrong here
The sourcetype is correctly set to linux_secure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume `maxpause` or timing is the culprit, but the real issue is that the `transaction` command requires all events in the group to share the same value for the specified field(s), and if the field is missing or null on other events, they cannot be correlated.
Detailed technical explanation
How to think about this question
Under the hood, the `transaction` command uses a state machine that opens a transaction when it sees the first event with a given field value (e.g., `session_id=abc123`). It then waits for subsequent events with the same field value within the `maxpause` window. If other events lack that field or have a different value, they are treated as separate transactions or ignored for that group. A common real-world scenario is correlating SSH sessions where `session_id` is derived from a unique identifier in the authentication log, but subsequent command logs (e.g., from `audit.log` or `bash_history`) do not carry that identifier, requiring a different correlation strategy like `append` or `join`.
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-1003 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.
Transactions and Event Correlation — This question tests Transactions and Event Correlation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The session_id field is only populated for the 'Accepted publickey' event, so other events have a different or null session_id and do not join the transaction. — Option B is correct because the `transaction` command groups events by the `session_id` field. If `session_id` is only extracted from 'Accepted publickey' events (e.g., via a `rex` or `eval` command), subsequent commands and logout events will have a null or different `session_id`. Since `transaction` requires all events in the group to share the same `session_id` value, those other events cannot join the transaction, resulting in a transaction containing only the single 'Accepted publickey' event.
What should I do if I get this SPLK-1003 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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