IT Security Essentials

A Denial of Service (DoS) attack aims to disrupt or completely shut down a network, service, or server, making it unavailable to its intended users. This is typically achieved by overwhelming the target with a flood of superfluous requests.

Antivirus and malware detection programs scan files looking for specific patterns or signatures in the programming code that match known malware. This signature-based detection helps identify threats that have already been documented by security researchers.

Degaussing uses a powerful magnetic field to disrupt the magnetic domains on a hard drive, completely destroying the data and making the drive unusable. While physical destruction like drilling is also used, formatting and defragging do not securely erase confidential data.

Physical security involves measures designed to safeguard personnel, hardware, programs, networks, and data from physical circumstances and events. Requiring a card key to enter a secure area directly controls physical access to the facility, unlike firewalls, encryption, and software updates, which are logical or digital security measures.

A personal firewall monitors and controls incoming and outgoing network traffic based on predetermined security rules. Its primary job is to block unauthorized access while permitting outward communication, acting as a barrier between a trusted network and untrusted networks.

Disconnecting the host from the network is an immediate way to isolate the device and observe if the network traffic flood stops. If the network performance improves immediately after disconnection, it confirms that the specific host was the source of the traffic.

Adware is a type of software designed to automatically present advertisements, such as pop-ups or banners, on a user's screen. While spyware secretly gathers information and Trojan horses disguise themselves as legitimate software, adware's primary characteristic is displaying unwanted ads.

Spoofing is a technique where an attacker masquerades as another device or user on a network by falsifying data, such as IP or MAC addresses, to bypass access controls. This allows the attacker to intercept traffic or gain unauthorized access to systems.

WEP (Wired Equivalent Privacy) and WPA (Wi-Fi Protected Access) are security protocols designed to secure wireless networks by encrypting data transmitted over the air. They ensure that unauthorized users cannot easily intercept and read wireless network traffic.

A computer virus is a malicious software program designed to alter the way a computer operates and spread from one computer to another. It is written with malicious intent to damage files, steal data, or disrupt system operations.