Computer Science

A firewall is used to protect a network server by controlling incoming and outgoing network traffic based on predetermined security rules, thereby preventing unauthorized access and potential damage from users who log in.

A File Infector Virus specifically attaches itself to executable files and spreads when the infected program is run. Worms, spyware, and adware do not typically attach to executable files in this manner.

A Trojan Horse is a type of malware that disguises itself as legitimate software to trick users into installing it. The other options are unrelated to malware types.

A worm is a type of malware that can replicate itself and spread independently without needing to attach to a host file, unlike viruses such as macro viruses which require a host file to propagate.

Hacking is a form of cybercrime involving unauthorized access to computer systems or networks, which distinguishes it from software or hardware, which are not crimes themselves.

Two-Factor Authentication (2FA) adds an extra layer of security by requiring users to provide two different types of credentials, typically something they know (password) and something they have (a code sent to their phone), making unauthorized access much harder.

Authentication typically involves verifying a user's identity using credentials such as a username and a password. Therefore, both username and password are components of authentication.

Cyber warfare involves the use of digital technologies, such as spyware, hacking, and cyber attacks, to damage systems, infrastructure, or gain advantages during conflicts. Both statements A and B describe aspects of cyber warfare.

A firewall is a security system designed to prevent unauthorized access to or from a private network, which matches option B. The term '630 Firewall' likely refers to a specific firewall model or product, but the general definition of a firewall remains the same.

Crimes committed using computers and the internet are specifically termed 'Cybercrime,' which involves illegal activities conducted through digital means.