attaching themselves to other programs (e.g.‚ word processors or spreadsheets application files) or to the boot sector of a disk. When an infected file is activated - or executed - or when the computer is started from an infected disk‚ the virus itself is also executed. Often‚ it lurks in computer memory‚ waiting to infect the next program that is activated‚ or the next disk that is accessed. What makes viruses dangerous is their ability to perform an event. While some events are harmless (e.g. displaying
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storage devices are not attached to the computer’s CPU‚ it takes a longer time for the CPU to access them. These devices need to be formatted before they can store data Examples of secondary storage devices include CD and DVD‚ flash memory‚ floppy disks etc Tertiary Computer Storage Devices Its main use is for storing data at a very large-scale. These devices require a database to organize the data that are stored in them‚ and the Example :tape libraries. SECONDARY STORAGE
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The Power On Self Test When the system is powered on‚ the BIOS will perform diagnostics and initialize system components‚ including the video system. (This is self-evident when the screen first flicks before the Video Card header is displayed). This is commonly referred as POST (Power-On Self Test). Afterwards‚ the computer will proceed its final boot-up stage by calling the operating system. Just before that‚ the user may interrupt to have access to SETUP. To allow the user to alter the CMOS
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stands for Random Access Memory or Read and Write Memory. This contains the information the computer needs to carry out the particular task you want. When you switch off the computer‚ RAM empties itself. You can save your work on CD-ROM‚ DVD ROM Disk‚ Floppy Disk‚ Flash Drives‚ etc. Storing Information: Each memory cells stores binary digits. It is easy to see that the size of computers RAM is important because the computer can only do the amount of work that it has room for. Computer Memory
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John von Neumann was a Hungarian-American pure and applied mathematician‚ physicist‚ and polymath. He made major contributions to a number of fields‚ including mathematics‚ physics‚ economics‚ computing and statistics. The basic concept behind the von Neumann architecture is the ability to store program instructions in memory along with the data on which those instructions operate. The von Neumann machine was developed by John Von Neumann and others in the 1940s that allow for input‚ output‚ processing
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VOIP OVERVIEW This particular project is a solution developed to communicate between the users across worldwide through Internet. A message or information can be sent via many medias such as it can be telephonic‚ telegrams‚ fax etc to the recipient. Each such information requires a high level of security. To maintain such security and smooth completion of any communication it requires more time and human effort in manual systems. The entire process has been automated using JAVA
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1. What is a Virus? A computer virus is a program that can copy itself and infect a computer without the user knowing. Some viruses are made to damage the computer by damaging programs‚ deleting files‚ or reformatting the hard disk. Others are not designed to do any damage‚ but replicate themselves and perhaps make their presence known by displaying text‚ video‚ or audio messages. Even these benign viruses can create problems for the computer. They usually take up computer memory used by other programs
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cameras‚ a user downloads the stored pictures from the digital camera to a computer using special software included with the camera. With others‚ the camera stores the pictures directly on a floppy disk or on a PC Card. A user then copies the pictures to a computer by inserting the floppy disk into the disk drive or the PC Card into a PC Card slot (Chambers and Norton 134). Once stored on a computer‚ the pictures can be edited with photo-editing software‚ printed‚ faxed‚ sent via electronic mail
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| |Secondary Storage; | | |floppy disks‚ | | |hard disk‚ | | |CD-ROM |
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What risks and safeguards are associated with wireless communication? What is “war driving” or “war flying”? Are you comfortable (or would you use) a wireless “hot spot” to do computer work? What safeguards might you use in accessing an unprotected (public) wireless communications? Are you more at risk using a wireless connection via laptop or a connection via a smart phone? Transmissions over wireless networks can be intercepted by any suitable device within the transmission radius. If a network
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