CompTIA Updated CS0-003 Exam Questions and Answers by minnie

TCPDump is the best tool to prove whether the server was experiencing a DoS attack related to half-open TCP sessions consuming memory. TCPDump is a command-line tool that can capture and analyze network traffic, such as TCP, UDP, and ICMP packets. TCPDump can help the administrator to identify the source and destination of the traffic, the TCP flags and sequence numbers, the packet size and frequency, and other information that can indicate a DoS attack. A DoS attack related to half-open TCP sessions is also known as a SYN flood attack, which is a type of volumetric attack that aims to exhaust the network bandwidth or resources of the target server by sending a large amount of TCPSYN requests and ignoring the TCP SYN-ACK responses. This creates a backlog of half-open connections on the server, which consume memory and CPU resources, and prevent legitimate connections from being established12. TCPDump can help the administrator to detect a SYN flood attack by looking for a high number of TCP SYN packets with different source IP addresses, a low number of TCP SYN-ACK packets, and a very low number of TCP ACK packets34. References: SYN flood DDoS attack | Cloudflare, What is a SYN flood attack and how to prevent it? | NETSCOUT, TCPDump - A Powerful Tool for Network Analysis and Security, How to Detect a SYN Flood Attack with TCPDump

Comprehensive and Detailed Explanation From Exact Extract:

The behavior described is a high-level objective: gain unauthorized access to a vulnerable system. In MITRE ATT&CK, tactics represent the attacker’s high-level goals (the “why”), such as gaining initial access. That makes this observation a tactic-level description rather than a technique/procedure.

The All-in-One CS0-003 guide defines tactics as high-level goals and explicitly includes “gaining initial access” as an example:Exact extract (All-in-One Exam Guide): “Tactics The high-level goals attackers are trying to achieve, such as gaining initial access, persistence, or exfiltrating data.”

It also describes Initial access as the goal of gaining a foothold (i.e., unauthorized access) into a target system/network:Exact extract (All-in-One Exam Guide): “Initial access. Tactics used by attackers to gain a foothold within a target network or system…”

Why the other options are not correct:

B (Techniques): Techniques are the specific methods used to accomplish a tactic (the “how”), not the high-level goal itself.Exact extract (All-in-One Exam Guide): “Techniques The specific methods and procedures attackers use to achieve their goals.”

A (Procedures): Procedures are the step-by-step sequences for executing techniques (an attacker’s “attack playbook”), not the high-level goal statement.

D (Subtechniques): Subtechniques are more granular breakdowns under a technique; your statement doesn’t describe a specific technique, so it can’t be placed at the subtechnique level.

References (CompTIA CySA+ CS0-003 documents / study guides used):

Mya Heath et al., CompTIA CySA+ All-in-One Exam Guide (CS0-003): tactics are high-level goals (e.g., gaining initial access); initial access definition; techniques definition; procedures as step-by-step sequences

Transfer is the risk management principle that is accomplished by purchasing cyber insurance. Transfer is a strategy that involves shifting the risk or its consequences to another party, such as an insurance company, a vendor, or a partner. Transfer does not eliminate the risk, but it reduces the potential impact or liability of the risk for the original party. Cyber insurance is a type of insurance that covers the losses and damages resulting from cyberattacks, such as data breaches, ransomware, denial-of-service attacks, or network disruptions. Cyber insurance can help transfer the risk of cyber incidents by providing financial compensation, legal assistance, or recovery services to the insured party. Official References:

https://partners.comptia.org/docs/default-source/resources/comptia-cysa-cs0-002-exam-objectives

https://www.comptia.org/certifications/cybersecurity-analyst

https://www.comptia.org/blog/the-new-comptia-cybersecurity-analyst-your-questions-answered