CS0-004 Exam Dumps : CompTIA Cybersecurity Analyst CySA+ V4 (New Version)

The log relationships support two conclusions: ws-57 is scanning dc-1 , and ws-57 is communicating with a service through a non-standard port . Network scanning is normally identified when one source system attempts connections against multiple ports or services on another host over a short period. Here, the directionality of the recorded communications identifies ws-57 as the initiating host and dc-1 as the target, supporting option A rather than B.

Port numbers then need to be interpreted in context. Standard service-port mappings provide useful baselines, but a service can technically operate on a port different from its conventional assignment. Detection logic therefore needs to consider both the actual port number and the protocol or service identified in the traffic. Nmap, for example, classifies scanned ports according to states and attempts to associate ports with known services during network reconnaissance.

The entries do not provide sufficient behavioral evidence for phishing delivery or ransomware infection. Those conclusions would require additional indicators such as SMTP message evidence, malicious attachments, encryption activity, process execution, or endpoint telemetry.

The correct analytical approach is to determine source, destination, connection pattern, and port/service relationship before assigning malicious intent.

Study Guide Reference: Security Operations → Network Log Analysis → Scanning/Enumeration → Source/Destination Interpretation → Ports and Protocols → Non-standard Service Ports.

The analyst should prioritize tlindy because the activity associated with that account presents the strongest anomaly in the supplied access-log evidence. Web access-log analysis is fundamentally contextual: an analyst compares source information, request behavior, authentication activity, timestamps, response codes, geographic indicators, user-agent characteristics, and established behavioral expectations to determine which entry warrants immediate investigation.

The fact that the organization is explicitly identified as being based in the United States is an important contextual clue. Geographic or behavioral activity inconsistent with the expected operating profile of an account can raise investigative priority, particularly when combined with unusual authentication or web-request characteristics. Importantly, geographic deviation alone does not prove compromise; VPN services, business travel, cloud infrastructure, and remote-working arrangements can produce legitimate anomalies. The correct SOC action is therefore investigation rather than immediate attribution.

This question tests the analyst's ability to distinguish normal activity from anomalous activity using log context , rather than simply searching for a particular HTTP status code or username. CySA+ expects analysts to correlate multiple data points before establishing whether activity represents an indicator of compromise.

The uploaded examination material identifies tlindy as the account requiring first investigation.

Study Guide Reference: Security Operations → Log Analysis → Web Application Logs → Behavioral Indicators → Anomaly Detection → User and Entity Context.

The original scan fails because Nmap's host-discovery process concludes that the target appears offline before conducting the intended full port scan. Option C adds -Pn , instructing Nmap to skip normal host discovery and proceed with scanning the target as though it is online. The -p- option then instructs Nmap to test the complete TCP port range rather than only its default set.

This is appropriate when a live host does not respond to discovery probes because ICMP echo traffic or other discovery packets may be filtered by firewalls, host-based controls, or network policy. A system can therefore appear “down” to Nmap's discovery phase while still exposing reachable TCP services.

Option B uses -sn, which performs host discovery without a port scan and therefore contradicts the requirement. Option A scans only a limited set of explicitly identified ports and includes unrelated functionality. Option D unnecessarily changes the scope to an entire /24, performs operating-system detection and DNS resolution, and invokes an SSL cipher script; none of those modifications addresses the immediate host-discovery problem.

Study Guide Reference: Vulnerability Management → Nmap → Host Discovery → -Pn → Full Port Scanning -p- → Firewall/ICMP Filtering → Scan Troubleshooting.