What is the primary purpose of a firewall in a computer network? MCQ with Answer and Explanation

Explanation:
Data exfiltration is the unauthorized transfer of data from a system, often carried out by attackers to steal sensitive information.

Explanation:
Mobile devices face multiple security threats, including malicious apps, physical theft, and unsecured Wi-Fi networks that can be exploited by attackers.

Explanation:
Encryption is a two-way function that can be reversed with a key, while hashing is a one-way function that produces a fixed-size output from input and cannot be reversed to obtain the original data.