The answer is that the stacked option misinterprets null values as negative, causing impossible negative values in your stacked area chart. This occurs because Splunk’s stacked area chart treats missing data points—such as when a department has no wait time records for a given day—as zero by default, but when combined with the stacking logic, those zeros can be rendered as negative values to maintain the visual stack order. On the SPLK-1003 exam, this tests your understanding of how null handling affects timechart visualizations, a common trap where candidates assume raw data integrity guarantees chart accuracy. Remember that timechart with stacked area charts requires explicit null handling, such as using `fillnull` or `usenull=f` to prevent misinterpretation. Memory tip: “Stacked charts stack nulls into negatives—fill the gaps to fix the facts.”
SPLK-1003 Advanced Visualization and Lookups Practice Question
This SPLK-1003 practice question tests your understanding of advanced visualization 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.
You are a Splunk power user working for a healthcare organization. You have created a visualization that shows patient wait times by department over the last 30 days. The chart uses a timechart command with a 'stacked' option. Recently, the chart started showing negative values for some departments, which is impossible because wait times cannot be negative. You have verified that the raw data is correct and contains only positive wait times. The search is: index=healthcare sourcetype=patient_wait | timechart span=1d avg(wait_time) by department. The chart is displayed as a stacked area chart. The negative values appear only for a few departments sporadically. You suspect the issue is related to how null values are handled. What could be causing the negative values?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The 'stacked' option is misinterpreting null values as negative.
Option C is correct because stacked area charts can misrepresent null values as negative when there are gaps in data. Option A is wrong because timechart limit=0 does not cause negatives. Option B is wrong because overlapping time ranges would affect counts, not produce negatives. Option D is wrong because 'other' category does not cause negatives.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 timechart command is using 'limit=0' which causes overcounting of series.
Why it's wrong here
limit=0 includes all series, does not create negatives.
✗
There is a counting error in the search due to overlapping time ranges from data indexing delays.
Why it's wrong here
Overlapping would affect counts but not produce negative values.
✗
The use of 'other' category in stacked charts can cause negative values when there are many series.
Why it's wrong here
The 'other' category aggregates, not causes negatives.
✓
The 'stacked' option is misinterpreting null values as negative.
Why this is correct
Stacked charts can interpret nulls as negative for series with gaps.
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related SPLK-1003 OSPF questions on adjacency and route selection.
Advanced Visualization and Lookups — This question tests Advanced Visualization and Lookups — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The 'stacked' option is misinterpreting null values as negative. — Option C is correct because stacked area charts can misrepresent null values as negative when there are gaps in data. Option A is wrong because timechart limit=0 does not cause negatives. Option B is wrong because overlapping time ranges would affect counts, not produce negatives. Option D is wrong because 'other' category does not cause negatives.
What should I do if I get this SPLK-1003 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related SPLK-1003 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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