SC-200 Manage a security operations environment Practice Question
Your organization uses Microsoft Defender for Cloud Apps and Microsoft Sentinel. You notice that a large number of log entries from Defender for Cloud Apps are being dropped at ingestion due to 'malformed data' errors. The data connector shows a healthy status. What is the most likely cause?
⚠ Common exam trap
The trap here is that candidates see a 'healthy' connector status and assume the issue must be with the log format or connectivity, but Microsoft deliberately tests the nuance that ingestion rate limits can cause data truncation without breaking the connector's health status.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The data volume exceeds the workspace's ingestion capacity, causing data truncation.
When the data volume exceeds the Log Analytics workspace's ingestion capacity, Defender for Cloud Apps log entries can be truncated mid-record, causing them to be malformed and dropped. The connector status remains healthy because the connector itself is still connected and receiving data, but the workspace's ingestion rate limit (typically 500 MB/min per workspace or 2 GB/min per workspace depending on pricing tier) causes truncation, not a connectivity or authentication failure.
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 log type is not supported by Sentinel.
Why it's wrong here
Sentinel's Defender for Cloud Apps connector relies on pre-defined data tables (such as SecurityAlert, SecurityEvent, or McasAlertLogs) with a fixed schema. If a log type were genuinely unsupported, the ingestion pipeline would reject it outright with schema validation or parser errors, not deliver partial or truncated logs. Since the symptom involves data being ingested but malformed, an unsupported log type is not the root cause.
- ✗
The Log Analytics workspace key has expired.
Why it's wrong here
The Log Analytics workspace key is used for agent-based or legacy data collection authentication, but the Sentinel-to-Defender for Cloud Apps connector authenticates via Microsoft Entra ID and Azure Resource Manager, not a workspace key. Even if a legacy connectivity method used a key, an expired key would produce a 401 Unauthorized error and cause a complete transmission failure, visible in the connector health status. Expired keys do not cause throttling-related truncation or partial log ingestion.
- ✓
The data volume exceeds the workspace's ingestion capacity, causing data truncation.
Why this is correct
Log Analytics workspaces enforce ingestion rate limits (for example, 500 MB per minute or a 100 GB per-day cap depending on the pricing tier). When the combined volume from all sources exceeds these thresholds, the platform throttles ingestion and drops or truncates the excess data, which can result in partially written JSON records that appear as malformed logs. This specifically explains why a high data volume scenario would produce parsing or truncation errors without any authentication or connectivity issues.
- ✗
The Defender for Cloud Apps connector is blocked by a firewall.
Why it's wrong here
A firewall block would prevent the Defender for Cloud Apps connector from establishing an outbound connection to Microsoft's public API or ingestion endpoints, resulting in timeouts, TCP resets, or HTTP 403/407 proxy errors. These conditions are reported as connectivity failures in the Sentinel data connector's health monitoring, and they cause a complete loss of data transmission rather than partial or malformed logs. Since the described issue is about data being truncated after ingestion, a firewall is not the correct explanation.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SC-200 practice question is part of Courseiva's free Microsoft 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 SC-200 exam.