CompTIA CySA+ Practice Test 2026 – The Comprehensive All-in-One Guide to Exam Success!

A botnet is defined as a network of compromised computers that are remotely controlled to perform coordinated tasks, often malicious in nature. Typically, these tasks include launching Distributed Denial of Service (DDoS) attacks, sending out spam emails, or distributing malware to other systems. The device owners often remain unaware that their systems are part of a botnet, as they have been infected with malware that enables the attacker to take control.

The other options describe different cybersecurity concepts. A secure network protecting against malware would not inherently involve the malicious activities associated with a botnet. Encrypting sensitive data pertains to safeguarding information but does not involve the collective efforts of compromised devices in an attack. Finally, a firewall's primary role is to monitor and control incoming and outgoing network traffic based on predetermined security rules, which is unrelated to the nature of a botnet. Understanding the role of a botnet emphasizes the importance of cybersecurity measures to prevent infection and mitigate risks.