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This printer has the speed of lines per minute. So, each user manages his own post. Application software cannot run on itself but is dependent on system software to execute. An image map is a file containing information that associates different locations on a specified image with hypertext links. IP Internet Protocol addressing: Circuit-level Gateway 4.
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Be the first to like this. No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Computer Lab 8. When a system administrator assembles ineffective hardware and software such that the system is seriously flawed from a security point of view Protection Layer 1.
Packet Filter 2. Application Gateway 3. Circuit-level Gateway 4. Proxy Server Chassis Repeater Gateway A specialized system that connects terminals to a network It does not include an Internet server, but it does have a built-in web browser and FTP client. Noise absorption: Susceptibility to external noise 2.
Leakage of signal 3. Twisted-pair wire: LAN 2. Coaxial cabling: Cable TV 3. Fiber-optic cabling: Broadband Insulator Teflon in Cat 5 Gigabyte Ethernet Terrestrial 2. Satellite A file system is the underlying structure a computer uses to organize data on a hard disk. If you are installing a new hard disk, you need to partition and format it using a file system before you can begin storing data or programs.
It has many benefits over the earlier FAT32 file system, including: FAT32 does not have the security that NTFS provides, so if you have a FAT32 partition or volume on your computer, any user who has access to your computer can read any file on it.
FAT32 also has size limitations. Input Devices - Keyboard, Mouse, joystick, Scanner, web cam. Keyboard - A keyboard is the set of typewriter-like keys that enables you to enter data into a computer. Computer keyboards are similar to electric-typewriter keyboards but contain additional keys.
The keys on computer keyboards are often classified as follows: The mouse allows an individual to control a pointer in a graphical user interface GUI and manipulate on-screen objects such as icons, files, and folders.
Joystick - A lever that moves in all directions and controls the movement of a pointer or some other display symbol. A joystick is similar to a mouse, except that with a mouse the cursor stops moving as soon as you stop moving the mouse.
With a joystick, the pointer continues moving in the direction the joystick is pointing.
To stop the pointer, you must return the joystick to its upright position. Most joysticks include two buttons called triggers.
Output Devices- Monitors, Printers. Monitor is a standard output devices. Which shows the output information. Monitor is also one of the important parts of computer, because without monitor, system can't work so that this is the standard output device. Monitors are of three types: CRT Monitors.
LCD Monitors. LED Monitors. These are all old model monitors. Main disadvantages are heavy weight, occupy more place, high power consumption, high radiation and supports low resolution.
The main advantage of LCDs are light weighty, occupy less place, 12v power consumption, low radiation and supports high resolutions. Printer is the most popular output device used today to produce hard copy output. There are many types of printers which are used by the users as according to their need. These are very useful nowadays as all the things which are uneasy to read on the monitor screen we used to print those things and read carefully.
Below we describe the various types of Printers. Dot-Matrix Printer- It is a character printer that print one character at a time. This Printer can form characters and all kinds of images as pattern of dots. Since dot matrix printer produce printed output as pattern of dots, they can print any shape of character that a program can describe.
They therefore, can print many special characters, different sizes of print, and also have the ability to print graphics such as charts and graphs. Dot Matrix printer are normally haves slow printing speeds ranging from characters per second. They are available at very low cost.
These types of printers are generally used to print the shipping invoices. Inkjet Printers- It prints characters by spraying patterns of ink on the paper from a nozzle or jet that can heated up selectively. The ink comes out of the nozzle in a form of vapors.
It is also a Character printer but it produces high quality output than dot matrix printers because these printers form characters with very tiny ink dots. Inkjet printers are slower than dot matrix printer as inkjet printing speed is characters per second.
Inkjet printer is also more expensive than dot matrix because it produces the high quality prints with more transformed technology. These printers are very popular because they are less expensive than laser printers and can print faster and accurate than dot matrix and other impact printers.
Drum Printer - Drum printer is a line printers that print one line at a time.
In addition the drum printer is also the impact printer. In this Printer it has a set of hammers mounted in front of the drum in a manner that an inked ribbon and paper can be placed between the hammers and the drum. Than the drum rotates at a high speed. A character is printed at a desired print position. This printer has the speed of lines per minute. A standard character set may have 48, 64 and 96 characters.
It allows the printing to be done in different fonts and styles in the same printer. Laser Printers- Laser printers are the page printers that prints one page at a time.
Main component of the laser printer are a laser beam source, multi sided mirror, a photoconductive drum, and toner. Laser printers produces high quality output because they form characters by very tiny ink particles. The high end laser printer can have a resolution of dpi. Due to the high resolution, these printers give excellent graphics art quality. Laser printers are faster than other printers discussed earlier. Low speed laser printers can print 4 to 12 pages per minute. Owing to their better print quality and printing speed, laser printers are more expensive than the other types of the printers.
These printers are very popular in the market because of its fast printing. Multimedia is the field concerned with the computer-controlled integration of text, graphics, drawings, still and moving images Video , animation, audio, and any other media where every type of information can be represented, stored, transmitted and processed digitally.
A Multimedia Application is an Application which uses a collection of multiple media sources e. Text - text is a human-readable sequence of character s and the words they form that can be encoded into computer-readable formats such as ASCII.
Text is usually distinguished from non-character encoded data, such as graphic images in the form of bitmap s and program code, which is sometimes referred to as being in "binary" but is actually in its own computer-readable format. Graphics - Computer graphics are pictures created using computers and the representation of image data by a computer specifically with help from specialized graphic hardware and software.
Animation — Animation is the technique of photographing successive drawings or positions of puppets or models to create an illusion of movement when the film is shown as a sequence.
Audio - Audio is sound within the acoustic range available to humans. An audio frequency AF is an electrical alternating current within the 20 to 20, hertz cycles per second range that can be used to produce acoustic sound. Images - An image is a visual representation of something. In information technology, the term has several usages: An image can be described in terms of vector graphics or raster graphics. An image stored in raster form is sometimes called a bitmap.
An image map is a file containing information that associates different locations on a specified image with hypertext links.
Video - Refers to recording, manipulating, and displaying moving images, especially in a format that can be presented on a video device like TV, CD player, Mobile phones etc. Names of common multimedia file formats -. Audio Files. Audio Interchange File Format. Interchange File Format. Media Playlist File. MIDI File. MP3 Audio File. Real Audio File. Windows Media Audio File.
Video Files. Advanced Systems Format File. Audio Video Interleave File. Flash Video File. Apple QuickTime Movie. Real Media File.
SubRip Subtitle File. Shockwave Flash Movie. Windows Media Video File. Relationship between Hardware and Software. For a Computer to produce useful output its Hardware and Software must work together.
Nothing useful can be done with the Hardware on its own, and Software cannot be utilized without supporting Hardware. To take an analogy, a cassette player and its cassettes purchased from the market are Hardware. However,the songs recorded on the cassettes are its Software. To listen to a song,that song has to be recorded on one of the cassettes first, which is then mounted on the cassette player and played.
Similarly,to get a job done by a Computer,the corresponding Software has to be loaded in the Hardware first and then executed. Following important points regarding the relationship between Hardware and Software are brought out by this analogy: Both are complementary to each other.
Like we buy new cassettes for newly released songs or for songs whose cassettes, we do not have, we buy, new Software to be run on the same hardware as and when need arises, or funds become available. Computer software, or simply software is any set of machine-readable instructions that directs a computer's processor to perform specific operations.
Computer software includes computer programs, libraries and their associated documentation. The word software is also sometimes used in a more narrow sense, meaning application software only.