Viruses
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/ /A virus is a type of malicious software that is able to replicate itself and spread by inserting copies of its code into other executable programs without the user's consent or knowledge. It consists of a small set of instructions that allow it to reproduce and spread throughout an infected computer. There are two phases for a virus - an inert phase when it resides on a storage device, and an active phase when it is loaded into memory and can begin carrying out its programmed actions. Trojans are another type of malware that masquerade as legitimate programs to trick users into running them and allowing the malicious code to execute. In the past, virus programmers would exchange source code through websites called VX sites to share new programming techniques.
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OBJECTIVES
Introduction
What Is Virus?
Why Virus Are Called “Virus”?
How Do Virus Spread?
Virus Operation
How Virus work?
Common Virus Entry Points
Symptoms Of Virus Attack
Types of Computer Virus
Techniques used by Viruses
Anti-Virus Software
Methods used by Antivirus Software
Actions to Prevent Virus Infection
Conclusion
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this serious problem.
Computer Virus
This document discusses computer viruses, including what they are, the types of viruses, and how to prevent and remove them. It defines a computer virus as a program that can copy itself and infect other applications and files. The main types are boot sector viruses, which infect boot drives; program viruses, which infect executable files; and multipartite viruses, which combine the two. The document also lists some of the top sources of virus attacks and recommends using antivirus software like Norton, McAfee, and Kaspersky to scan for and remove viruses, as well as maintaining regular updates and safe digital practices.
Computer viruses
The document discusses computer viruses, including their history, how they spread, symptoms, and prevention methods. It notes that viruses are created by individuals to copy themselves and infect other computers. Today, 87% spread through the internet within hours or days. Symptoms include computers not booting, slowing down, or crashing. The best prevention methods involve using updated antivirus software, being cautious of unexpected files/attachments, and educating others to limit spread.
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History of the Internet
The document discusses the history and origins of the Internet. It began in 1969 as the ARPANET project funded by the US Department of Defense to create a decentralized network connecting computers. ARPANET linked the first four nodes and used early networking protocols. In the 1980s and 1990s, the Internet became available for civilian and commercial use. Tim Berners-Lee introduced the World Wide Web in 1991 using HTTP and the first web browser. By 2000, the number of devices connecting to the Internet grew so large that the original IP addressing system neared exhaustion, though new techniques helped avoid that problem and allowed migration to the new IPv6 system.
Java
Java was first created in 1991 under the name Oak and was officially announced in 1995 by Sun Microsystems. Sun Microsystems first released Java and its compiler in November 2006 and later released additional tools like bookcases in May 2007. The document then provides examples of basic Java programming concepts like variables, methods, and classes to explain object-oriented programming in Java.
Apple History
Apple Computer was founded in 1976 by Steve Jobs and Steve Wozniak to create personal computers. In 1984, Apple introduced the Macintosh, the first commercially successful computer with a graphical user interface and mouse. Throughout the 1980s and 1990s, Apple saw fluctuations in market share as Microsoft Windows became dominant. In 1998, Apple introduced the iMac which helped the company recover. Later products like the iPod, iPhone, and Intel-based Macs were also large commercial successes.
System Programming
The operating system is a set of programs that manages the software and hardware resources of a computer. It simplifies machine use through friendly graphics interfaces. An operating system organizes itself into different levels including the hardware, kernel, central memory, device manager, file system, shell commands, and application programs. Common types of operating systems include single-user systems for one person, multi-user systems for multiple people, and real-time systems that meet processing deadlines.
Electronics
Electronics refers to the flow of charge through semiconductors, whereas electrical refers to flow through metals. This field was originally called "Radio techniques" until 1950, as its main application was radio transmitters and receivers. Digital circuits use Boolean algebra and are the basis for digital computers, typically using two voltage levels of "Low" and "High" to represent 0 and 1. Most analog circuits are built from basic amplifier circuits and use a continuous range of voltages, though the distinction between analog and digital can be blurred as they both use linear and non-linear elements.
Graphic Tablet
A graphics tablet allows users to draw directly on a flat surface and includes buttons to zoom, rotate, and perform other functions to aid in artwork creation. While offering increased control and comfort, graphics tablets can be quite expensive, costing upwards of $1,999 as indicated by the seller in this case.
Platform Virtualization
Platform virtualization allows you to create virtual machines that behave like physical computers, enabling you to install multiple operating systems and programs on a single machine at once. It uses hypervisor software to emulate hardware and allocate resources to guest systems, while the actual hardware resources belong to the host system. Popular virtualization platforms include Xen, Microsoft Virtual PC, Qemu, VirtualBox, and VMWare, and virtualization provides benefits like safe testing of new software and running multiple systems simultaneously on a single server.
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Viruses
- 1. Virus