A network administrator is a person who is responsible to maintain to hardware and software that comprise a network. It usually a technical or network staff in an organization but rarely involved with direct user support.
Sunday, 26 June 2011
Network Operating System is the software that runs on a server and enables the server to manage data, users, groups, security, applications, and other networking functions. It allows to share files and printer access among multiple computers in a network, generally a local area network(LAN), or private network or to another network.
Saturday, 25 June 2011
Modulatioon is the process of conveying a message signal. It used to transform a baseband message signal into passband signal. A device that performs modulation is known as a modulator, and a device that performs the inverse operation of modulation is known as a demodulator (sometimes detector or demod). A device that can do both operations is a modem (modulator–demodulator).
Friday, 24 June 2011
Monday, 20 June 2011
Optical disk drives hold over 50 gigabytes of data. There are three types : Compact Disc (CD), Digital Versatile Disc (DVD), and Hi-Def Disc. Compact Disc is optical format which memory from 650MB to 1GB capacity with rotation speeds vary. Digital Versatile Disc known as Digital Video Disc (DVD) which similar to CDs, but can store more data from 4.7GB to 17GB on the single disc. Hi-Def Disc is the next generation of optical disc which far greater capacity than DVDs.
Disk caching improves hard disk performance by anticipating data needs. In modern disk drives, it includes a small amount of internal cache. Its function is similar to cache memory. When a program needs to access new data, the operating system first checks to see if the data is in the cache before reading it from the disk.
Sunday, 19 June 2011
Optical-character recognition (OCR) is the mechanical or electronic translation of scanned images of handwritten, typewritten or printed text into machine-encoded text. It is commonly used to convert books and documents into electronic files, to computerize a record-keeping system in an office, or to publish the text on a website.
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