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CompTIA CS0-003 Practice Test 22

Question 210

A security team risks capturing employee credentials during a broad full-packet investigation. What is the MOST appropriate analyst action based on the evidence?

  1. Confirm mirror-port direction and packet-loss counters before inferring a failed response.
  2. Minimize scope and restrict pcap access in accordance with evidence policy.
  3. Use a scoped tcpdump capture filter and preserve the output pcap.
  4. Apply a Wireshark stream filter and follow the matching TCP stream.

Explanation

Correct Answer

B:

Packet payloads may contain sensitive authentication and personal data. Minimize sensitive packet evidence collection.

Incorrect Answers

A:

Sensor vantage point can omit reverse traffic when mirroring is incomplete. That is relevant to wireshark and tcpdump operational choice, not to minimize sensitive packet evidence collection.

C:

Command-line packet capture can collect targeted traffic on headless systems. It could help capture DNS evidence via tcpdump, but it would not minimize sensitive packet evidence collection.

D:

Stream reassembly exposes application exchange across multiple packets. That is relevant to wireshark and tcpdump operational choice, not to minimize sensitive packet evidence collection.

Question 211

Object storage audit shows denied reads but no successful object retrieval. Which next step is MOST defensible for the security team?

  1. Correlate credential ID, source service and API actions to identify the actual principal.
  2. Normalize all event timestamps and validate time source before building the incident chronology.
  3. Distinguish access attempts from successful data access using response codes and byte counts.
  4. Preserve the change evidence and assess exposure window rather than asserting theft.

Explanation

Correct Answer

C:

Denied operations are not proof that data was exfiltrated. Classify failed versus successful cloud reads.

Incorrect Answers

A:

Service credentials can be copied across environments without changing identity name. It would detect cloud workload identity credential misuse, but it would not classify failed versus successful cloud reads.

B:

Clock and timezone differences can produce false event sequences. It could help reconcile cloud API versus app trace time, but it would not classify failed versus successful cloud reads.

D:

Misconfiguration creates risk even absent observed object download. It would assess cloud exposure without observed theft, but it would not classify failed versus successful cloud reads.

Question 212

An EDR alert attributes activity to `cmd.exe` without showing a parent or file path. Which action BEST aligns with sound security operations?

  1. Correlate the registry write with process ancestry and payload execution.
  2. Preserve command-line, downloaded content and account scope before containment.
  3. Verify actual file mode and associated execution records to investigate privilege risk.
  4. Request full process-tree and command-line enrichment before assigning malicious intent.

Explanation

Correct Answer

D:

Command interpreter use is too common to classify without execution context. Avoid unsupported conclusion from cmd.exe alone.

Incorrect Answers

A:

Persistence requires both the autorun configuration and its associated file context. It could help analyze Run key creation from command evidence, but it would not avoid unsupported conclusion from cmd.exe alone.

B:

Downloaded script plus privileged execution identity creates a concrete investigation chain. That is relevant to malware triage with command history, not to avoid unsupported conclusion from cmd.exe alone.

C:

Setuid changes can elevate execution privileges when effective and executable semantics apply. It would investigate suspicious setuid permission change, but it would not avoid unsupported conclusion from cmd.exe alone.

Question 213

A sensor drops packets under high load during suspected exfiltration analysis. Which response BEST addresses the security problem described?

  1. Measure capture loss and supplement with NetFlow and endpoint byte counters.
  2. Document the recording interval and avoid claiming the DNS event initiated the session.
  3. Set a narrow BPF capture filter for the host, destination direction and TCP port.
  4. Repeat capture with protocol-aware wider criteria and retain precise acquisition notes.

Explanation

Correct Answer

A:

Packet loss invalidates assumptions about complete content or transfer volume. Corroborate network transfer amid capture loss.

Incorrect Answers

B:

A partial trace cannot establish the true first event. It would recognize incomplete packet chronology, but it would not corroborate network transfer amid capture loss.

C:

Capture filters minimize irrelevant packets while preserving suspected C2 transactions. It could help target forensic packet capture by host and port, but it would not corroborate network transfer amid capture loss.

D:

Multi-channel protocols may use additional ports beyond their control connection. That is relevant to network filtering capture choices, not to corroborate network transfer amid capture loss.

Question 214

A WAF detects an injection string but the backend parameter is strictly typed and rejected. Which investigative or response action BEST fits the evidence?

  1. Inspect application response bodies and authentication audit outcomes before treating 200 as successful access.
  2. Verify actual backend execution and response evidence before concluding exploitation.
  3. Correlate device interface and flow records to determine inbound versus outbound origin.
  4. Join device GUID and reimage inventory instead of relying on hostname alone.

Explanation

Correct Answer

B:

Detection of a malicious request does not establish that it succeeded. Assess blocked injection exploit outcome.

Incorrect Answers

A:

HTTP success codes can describe delivered pages rather than authenticated sessions. It would separate HTTP 200 from successful login, but it would not assess blocked injection exploit outcome.

C:

Direction matters for attributing source, victim and exfiltration. That is relevant to application response and normalizer choice, not to assess blocked injection exploit outcome.

D:

Stable identifiers prevent merging unrelated devices or splitting one historical host. It would correlate endpoint across hostname change, but it would not assess blocked injection exploit outcome.

Question 215

A service identity begins accessing HR records that its normal role never queries. What is the MOST appropriate analyst action based on the evidence?

  1. Correlate device ID, VPN gateways and token history to test impossible-travel accuracy.
  2. Update the behavior baseline only after validating role change and legitimate scope.
  3. Compare behavior against historic role baselines and current approved change requests.
  4. Correlate authorized job duties, file access volumes and time without assuming guilt.

Explanation

Correct Answer

C:

Behavioral deviation is useful when tied to permission and business context. Detect abnormal service-account data reach.

Incorrect Answers

A:

VPN egress geography can differ from the user's physical location. It could help reduce VPN travel false positive, but it would not detect abnormal service-account data reach.

B:

Legitimate entitlement changes require contextual recalibration, not wholesale alert suppression. That is relevant to user behavior analytics, not to detect abnormal service-account data reach.

D:

Insider-risk signals require contextual examination and privacy-aware handling. It could help assess potential insider mass download, but it would not detect abnormal service-account data reach.

Question 216

A SIEM parser labels a source IP as destination IP after a new connector update. Which next step is MOST defensible for the security team?

  1. Normalize identity fields before running a time-bounded correlation.
  2. Narrow correlation windows using observed attack timings and clock accuracy.
  3. Deduplicate source event IDs and validate ingestion pipelines before tuning severity.
  4. Validate normalized fields against raw source logs before trusting correlation results.

Explanation

Correct Answer

D:

Incorrect field extraction reverses directionality and contaminates detections. Repair reversed SIEM network fields.

Incorrect Answers

A:

Field-format differences can hide otherwise related authentication and execution. That is relevant to siem query correlation and time windows, not to repair reversed SIEM network fields.

B:

Overly broad joins can attribute unrelated user actions to execution. It would reduce false joins from broad time window, but it would not repair reversed SIEM network fields.

C:

Ingestion duplication inflates alert counts without new adversary activity. It could help correct duplicate SIEM alert source, but it would not repair reversed SIEM network fields.

Question 217

A packet capture shows an HTTP exploit request but response logs indicate 403 and no server child process. Which action BEST aligns with sound security operations?

  1. Classify it as a likely blocked attempt pending any contradictory host evidence.
  2. Compare actual event IDs and host identifiers before treating them as one infection.
  3. Inspect underlying behavioral evidence and reproduction steps, not the label alone.
  4. Verify provenance and review behavior before creating an enterprise block rule.

Explanation

Correct Answer

A:

Attack payload submission does not mean a vulnerability was exploited. Distinguish exploit attempt from successful compromise.

Incorrect Answers

B:

Correlation group IDs can group separate activities and should not replace host evidence. It could help distinguish grouped alert from single infected host, but it would not distinguish exploit attempt from successful compromise.

C:

Automated verdicts require underlying artifacts for defensible conclusions. That is relevant to detection evidence validation, not to distinguish exploit attempt from successful compromise.

D:

External intelligence may incorrectly classify internal custom binaries. It would validate indicator before global blocking, but it would not distinguish exploit attempt from successful compromise.

Question 218

An analyst uses an overly narrow capture filter that excludes dynamically negotiated FTP data ports. Which response BEST addresses the security problem described?

  1. Document the recording interval and avoid claiming the DNS event initiated the session.
  2. Repeat capture with protocol-aware wider criteria and retain precise acquisition notes.
  3. Set a narrow BPF capture filter for the host, destination direction and TCP port.
  4. Measure capture loss and supplement with NetFlow and endpoint byte counters.

Explanation

Correct Answer

B:

Multi-channel protocols may use additional ports beyond their control connection. Recover missing negotiated data-channel traffic.

Incorrect Answers

A:

A partial trace cannot establish the true first event. It could help recognize incomplete packet chronology, but it would not recover missing negotiated data-channel traffic.

C:

Capture filters minimize irrelevant packets while preserving suspected C2 transactions. It would target forensic packet capture by host and port, but it would not recover missing negotiated data-channel traffic.

D:

Packet loss invalidates assumptions about complete content or transfer volume. It could help corroborate network transfer amid capture loss, but it would not recover missing negotiated data-channel traffic.

Question 219

A query joins IP strings where IPv4 and IPv6 representations differ across sources. Which investigative or response action BEST fits the evidence?

  1. Test rule output against documented benign and malicious examples before enabling paging.
  2. Anchor and constrain the expression to the actual malicious pattern with benign test cases.
  3. Normalize address types and representation before aggregation.
  4. Implement case-insensitive matching and test equivalent command variants.

Explanation

Correct Answer

C:

Text formatting mismatches can hide related network entities. Normalize address formats in SIEM rule.

Incorrect Answers

A:

Rule validation should measure signal quality, not just successful execution. That is relevant to regex and detection engineering, not to normalize address formats in SIEM rule.

B:

Overly permissive expressions create broad false positives. It would refine overly broad URL regex, but it would not normalize address formats in SIEM rule.

D:

Command-line switches can vary capitalization without changing behavior. That is relevant to regex and detection engineering, not to normalize address formats in SIEM rule.

Question 220

A sandbox produces a credential-theft label but the report has no evidence of credential access. What is the MOST appropriate analyst action based on the evidence?

  1. Compare actual event IDs and host identifiers before treating them as one infection.
  2. Verify provenance and review behavior before creating an enterprise block rule.
  3. Classify it as a likely blocked attempt pending any contradictory host evidence.
  4. Inspect underlying behavioral evidence and reproduction steps, not the label alone.

Explanation

Correct Answer

D:

Automated verdicts require underlying artifacts for defensible conclusions. Challenge unsupported sandbox verdict.

Incorrect Answers

A:

Correlation group IDs can group separate activities and should not replace host evidence. It would distinguish grouped alert from single infected host, but it would not challenge unsupported sandbox verdict.

B:

External intelligence may incorrectly classify internal custom binaries. It could help validate indicator before global blocking, but it would not challenge unsupported sandbox verdict.

C:

Attack payload submission does not mean a vulnerability was exploited. That is relevant to detection evidence validation, not to challenge unsupported sandbox verdict.


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