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CompTIA CS0-003 Practice Test 35

Question 340

An API fuzzing job includes destructive DELETE operations in production. What is the MOST appropriate analyst action based on the evidence?

  1. Resolve stable asset identifiers and IP ownership before launching probes.
  2. Update the scanning scope and required reporting obligations with governance approval.
  3. Seek written permission or use contractually available security assurance evidence.
  4. Disable state-changing tests until safe authorization and data-reset conditions exist.

Explanation

Correct Answer

D:

API security testing can delete real records when methods are misused. Avoid destructive API fuzzing.

Incorrect Answers

A:

Name ambiguity can result in probing unintended critical systems. It would prevent wrong-target scan from name collision, but it would not avoid destructive API fuzzing.

B:

Scan coverage must reflect current regulated system boundaries. It could help incorporate newly scoped regulated subnet, but it would not avoid destructive API fuzzing.

C:

Defensive intent does not authorize probing another organization's systems. That is relevant to scope drift and legal constraints, not to avoid destructive API fuzzing.

Question 341

An application uses anti-CSRF tokens that a scanner fails to refresh during forms submission. Which next step is MOST defensible for the security team?

  1. Configure stateful token handling and retest representative workflows.
  2. Limit payload creation and use dedicated sandbox accounts or staging where equivalent.
  3. Authenticate with approved API credentials and verify intended endpoint coverage.
  4. Adjust crawl authentication and excluded paths with application owners.

Explanation

Correct Answer

A:

Dynamic testing must maintain valid session and form state to reach functionality. Account for anti-CSRF token in DAST.

Incorrect Answers

B:

Active scanning must avoid destructive business-record side effects. That is relevant to web scanning scope and safety, not to account for anti-CSRF token in DAST.

C:

Denied scanning traffic does not test the business logic behind protected routes. It would improve API scanner coverage beyond 403, but it would not account for anti-CSRF token in DAST.

D:

Stateful apps need controlled scan paths to avoid destructive session effects. It could help prevent scanner disruption from logout routes, but it would not account for anti-CSRF token in DAST.

Question 342

An industrial controller reboots when a port scanner sends unusual probes. Which action BEST aligns with sound security operations?

  1. Verify asset presence and firmware through approved current inventory before prioritizing.
  2. Rely on passive traffic observation and vendor-approved OT discovery methods.
  3. Throttle scan concurrency and schedule a scoped assessment with network owners.
  4. Arrange approved active discovery within a bounded maintenance window.

Explanation

Correct Answer

B:

Legacy controllers may not tolerate ordinary active scan traffic. Scan fragile industrial systems safely.

Incorrect Answers

A:

Passive observations can become stale when devices are replaced or upgraded. That is relevant to passive network versus active discovery, not to scan fragile industrial systems safely.

C:

Scan-rate limits prevent assessment traffic from exhausting constrained links. It could help adjust scan rate for constrained network, but it would not scan fragile industrial systems safely.

D:

Passive discovery cannot identify silent assets absent observed network transmissions. That is relevant to passive network versus active discovery, not to scan fragile industrial systems safely.

Question 343

A vulnerability program schedules the same sensitive database scan twice without owner coordination. Which response BEST addresses the security problem described?

  1. Restore authorized management reachability and repeat the incomplete checks.
  2. Report reachable-target coverage and retry authorized unreachable groups through approved paths.
  3. Consolidate approved scan windows and communicate operational change impact.
  4. Reconcile address leases, MAC observations and owner records before deciding it is one device.

Explanation

Correct Answer

C:

Duplicated intrusive assessments create avoidable load and business interruption risk. Eliminate uncoordinated overlapping scans.

Incorrect Answers

A:

Scanning a blocked service cannot validate the underlying configuration. It would remediate blocked credentialed scan coverage, but it would not eliminate uncoordinated overlapping scans.

B:

Job completion does not establish exhaustive asset assessment. It could help distinguish scan job completion from coverage, but it would not eliminate uncoordinated overlapping scans.

D:

IP reuse and sensor vantage can produce ambiguous asset identities. It would resolve ambiguous discovered device identity, but it would not eliminate uncoordinated overlapping scans.

Question 344

An IPv4 discovery scan misses services bound only to IPv6. Which investigative or response action BEST fits the evidence?

  1. Integrate image assessment and orchestration inventory into the scanning workflow.
  2. Map backend pool members and scan each in authorized scope.
  3. Record third-party service inventory and assess vendor assurances through agreed channels.
  4. Expand authorized assessment to IPv6 address space and firewall policies.

Explanation

Correct Answer

D:

IPv6-only exposure remains invisible to an IPv4-only scan. Include IPv6 in asset discovery.

Incorrect Answers

A:

Ephemeral containers can disappear before ordinary network scans reach them. It could help include ephemeral container assets, but it would not include IPv6 in asset discovery.

B:

A shared virtual IP can hide different underlying versions. That is relevant to asset discovery completeness, not to include IPv6 in asset discovery.

C:

Asset management extends to externally hosted dependencies, subject to contractual authority. It would include SaaS dependencies in vulnerability program, but it would not include IPv6 in asset discovery.

Question 345

A DAST scanner follows logout links and repeatedly invalidates every user test session. What is the MOST appropriate analyst action based on the evidence?

  1. Adjust crawl authentication and excluded paths with application owners.
  2. Authenticate with approved API credentials and verify intended endpoint coverage.
  3. Configure stateful token handling and retest representative workflows.
  4. Limit payload creation and use dedicated sandbox accounts or staging where equivalent.

Explanation

Correct Answer

A:

Stateful apps need controlled scan paths to avoid destructive session effects. Prevent scanner disruption from logout routes.

Incorrect Answers

B:

Denied scanning traffic does not test the business logic behind protected routes. It would improve API scanner coverage beyond 403, but it would not prevent scanner disruption from logout routes.

C:

Dynamic testing must maintain valid session and form state to reach functionality. It could help account for anti-CSRF token in DAST, but it would not prevent scanner disruption from logout routes.

D:

Active scanning must avoid destructive business-record side effects. That is relevant to web scanning scope and safety, not to prevent scanner disruption from logout routes.

Question 346

A golden VM image is patched but new instances install outdated packages from a startup script. Which next step is MOST defensible for the security team?

  1. Move credentials to approved encrypted vault integration with rotation.
  2. Scan deployed instances and review bootstrap configuration, not just base images.
  3. Include the authorized hypervisor control plane in the scope and assess it separately.
  4. Regenerate unique agent identities and reconcile duplicate asset records.

Explanation

Correct Answer

B:

Post-boot automation can reintroduce vulnerabilities. Find vulnerabilities added by bootstrap script.

Incorrect Answers

A:

Assessment credentials themselves require protection and controlled access. It would secure stored scan credentials, but it would not find vulnerabilities added by bootstrap script.

C:

Virtualization host security is not covered by scanning guests alone. That is relevant to virtual assets and scanning credentials, not to find vulnerabilities added by bootstrap script.

D:

Shared agent IDs collapse or duplicate evidence across distinct machines. It would correct cloned VM scanner identity collision, but it would not find vulnerabilities added by bootstrap script.

Question 347

A VM image passes scan but deployment security groups make an admin service public. Which action BEST aligns with sound security operations?

  1. Review cloud IAM and control-plane posture with authorized configuration assessment.
  2. Assess endpoint access controls and private connectivity independently of IAM privileges.
  3. Validate effective runtime network configuration after deployment.
  4. Reject the recommendation and optimize retention or filtering under monitoring requirements.

Explanation

Correct Answer

C:

Secure images cannot compensate for permissive cloud network policy. Verify deployment-time external exposure.

Incorrect Answers

A:

Network probes alone cannot enumerate cloud account policies and entitlements. It could help assess cloud permission posture, but it would not verify deployment-time external exposure.

B:

Network reachability is a separate security boundary from database role grants. That is relevant to cloud assessment approaches, not to verify deployment-time external exposure.

D:

Cost controls should not erase mandatory audit visibility. It could help preserve cloud audit coverage during optimization, but it would not verify deployment-time external exposure.

Question 348

A decommissioned machine continues reporting vulnerabilities due to an orphaned scanner agent ID. Which response BEST addresses the security problem described?

  1. Supplement agent findings with authorized dynamic application testing.
  2. Tune agent scheduling and resource usage with kiosk owners.
  3. Deploy approved endpoint agents that report over sanctioned cloud management channels.
  4. Reconcile agent identity and disposal evidence in authoritative asset inventory.

Explanation

Correct Answer

D:

Old agent records can falsely inflate active exposure. Remove stale decommissioned scan agent.

Incorrect Answers

A:

Host package inspection does not cover every application-layer vulnerability. That is relevant to agent-based scanning design, not to remove stale decommissioned scan agent.

B:

Endpoint assessment must consider business performance impact. It would reduce agent scanner operational disruption, but it would not remove stale decommissioned scan agent.

C:

Agents can assess roaming endpoints without requiring internal network reachability. It could help cover remote roaming assets with agents, but it would not remove stale decommissioned scan agent.

Question 349

A customer portal is reachable through a public reverse proxy but internal scan misses its real hostname. Which investigative or response action BEST fits the evidence?

  1. Include sanctioned external DNS and virtual-host context in the assessment scope.
  2. Validate from an authorized external partner vantage, then narrow source controls.
  3. Perform approved inside-segment assessment and correct inappropriate trust exposure.
  4. Document scan vantage and intermediary certificates before comparing vulnerability findings.

Explanation

Correct Answer

A:

Host-header routing changes which application attack surface is tested. Test public virtual-host exposure.

Incorrect Answers

B:

Cloud reachability depends on network policy and source address. It could help assess partner-reachable SSH exposure, but it would not test public virtual-host exposure.

C:

External results do not measure lateral movement opportunities inside the network. That is relevant to internal and external scan differences, not to test public virtual-host exposure.

D:

Middleboxes can modify observed service and certificate characteristics. It would reconcile scan findings across proxies, but it would not test public virtual-host exposure.

Question 350

A compliance boundary changes and a previously excluded storage subnet now holds regulated records. What is the MOST appropriate analyst action based on the evidence?

  1. Disable state-changing tests until safe authorization and data-reset conditions exist.
  2. Update the scanning scope and required reporting obligations with governance approval.
  3. Resolve stable asset identifiers and IP ownership before launching probes.
  4. Seek written permission or use contractually available security assurance evidence.

Explanation

Correct Answer

B:

Scan coverage must reflect current regulated system boundaries. Incorporate newly scoped regulated subnet.

Incorrect Answers

A:

API security testing can delete real records when methods are misused. It could help avoid destructive API fuzzing, but it would not incorporate newly scoped regulated subnet.

C:

Name ambiguity can result in probing unintended critical systems. It would prevent wrong-target scan from name collision, but it would not incorporate newly scoped regulated subnet.

D:

Defensive intent does not authorize probing another organization's systems. It could help obtain third-party scan authorization, but it would not incorporate newly scoped regulated subnet.


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