Authentic CompTIA Certification Exam CS0-004 Questions Answers

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 -r file.pcap argument instructs TShark to read packets from the specified capture file, while -Y applies a Wireshark display filter . The expression "http or udp" therefore displays packets recognized as HTTP or packets using UDP.

Traditional HTTP traffic is unencrypted and can be dissected directly as HTTP. HTTPS normally carries HTTP inside TLS encryption and therefore is not displayed merely because the filter specifies http. DNS commonly operates over UDP, particularly for standard queries and responses, so ordinary DNS traffic satisfies the udp portion of the expression. Consequently, B is the best answer in the context of the available choices.

A technical distinction is important: the expression does not mean “HTTP or DNS specifically.” The udp portion matches UDP traffic generally, which can include protocols other than DNS. Nevertheless, within the examination scenario, the intended comparison is plaintext HTTP versus encrypted HTTPS together with standard UDP-based DNS.

Wireshark's documentation distinguishes display filters from capture filters, and TShark is the command-line network traffic analyzer within the Wireshark suite. CS0-004 places packet-analysis capabilities within Security Operations.

Study Guide Reference: Security Operations → Packet Analysis → Wireshark/TShark → PCAP Analysis → Display Filters → HTTP, UDP, and DNS.

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