Network Security Unit 1 Quiz

Study Notes

Data transmitted between computers is vulnerable to unauthorized access, modification, or forgery, highlighting the need for security mechanisms.
Security systems are essential to ensure data remains protected when leaving its physical confines.

Computer Security: Refers to tools and measures designed to protect data from unauthorized access and prevent hacking.
Network Security: Involves both hardware and software measures to protect an organization's computer network and data during transmission.
Internet Security: Focuses on safeguarding systems and activities of users while connected to the internet, protecting against cyber threats.
Threat: A potential violation of security that may exploit vulnerabilities, posing risks to data integrity.
Attack: An attempt to gain unauthorized access to or alter information, signifying a breach in security protocols.
Hacker: An individual who uses computer systems to gain unauthorized access for personal gain or disrupt services.

A virus is malicious code that replicates and disrupts the functionality of the system it infects.
Entry methods for viruses include email attachments, misleading advertisements, and software downloads from untrusted sources.
Objective: Viruses aim to replicate and steal sensitive data from infected systems.

Parasitic Virus: Attaches to executable files, replicating when the program runs and seeking other targets to infect.
Memory-Resident Virus: Resides in the main memory and infects every program executed thereafter.
Boot Sector Virus: Infects the master boot record and spreads when the system is started from the infected disk.
Stealth Virus: Designed to evade detection by disguising its presence from antivirus software.
Polymorphic Virus: Changes its appearance with each infection, complicating detection based on signature analysis.
Metamorphic Virus: Mutates entirely with each iteration, further enhancing evasion tactics and potentially altering behavior.

Install anti-malware programs to prevent unauthorized software installations.
Avoid downloading software from unreliable sources and scanning email attachments before opening.
Steer clear of cracked or hacked software, which often contains malware.
The most effective defense against viruses is up-to-date antivirus software that regularly scans and removes malicious entities.
Antivirus software can be obtained via online downloads or by purchasing physical copies for installation.