Knowledge on IT Infrastructure


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This is the basic knowledge of an IT Infrastructer.Which help to understand the requirment of IT ,Clients ,server and the work flow of the Information. The network connection and the Layars of OSI model to understand how the data is moving in a network.

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Knowledge on IT Infrastructure

  1. 1.    It can be generally defined as the set of interconnected structural elements that provide framework supporting an entire structure of development. WHAT IS AN IT INFRASTRUCTURE:”IT infrastructure consists of the equipment, systems, software, and services used in common across an organization, regardless of mission/program/project. IT Infrastructure also serves as the foundation upon which mission/program/project-specific systems and capabilities are built.”
  2. 2.     Client Server Networks Connections/Interface
  3. 3.        A client is a Computer system that accesses a (remote) service on another computer by some kind of network. The basic components that work together to execute computer's operation:there are 4 main basic components that shape the basic architecture of computer. INPUT DEVICES MEMORY PROCESSOR OUTPUT DEVICES
  4. 4. It is the computer hardware that produce data. The data had been produced will be sent to the computer’s primary memory. Input devices usually used by end users. The most simple example of input devices is your keyboard and mouse
  5. 5.  Memory in computer can be divided into 2 main types. There are primary memory and secondary memory. Primary Memory It keeps data temporarily, so that it usually called the volatile memory. Once power is off,the data which had been kept in this type of memory get disappeared . The example of primary memory is Random Access Memory (RAM)
  6. 6. Secondary Memory It keeps data permanently, so that it usually called nonvolatile memory, this type of memory is use to store the data for a longer period of time. The example of secondary memory in computer is hard disk ,flash disk,CD.
  7. 7.  PROCESSOR It is the “brain of computer” which play the most important roles. The processor will changes the data produced by input devices into usable information.
  8. 8.  OUTPUT DEVICES It is the computer hardware that displays the information to the end users. The types of information that can be displayed by output devices are video, text, picture, animation, audio and many more. The information displayed can be softcopy or hardcopy.
  9. 9.   In information technology, a server is a physical computer (a Computer hardware system) dedicated to running one or more such services (as a host), to serve the needs of users of the other computers on the network. The "server" performs some computational task on behalf of "clients". The clients either run on the same computer or connect through the network.
  10. 10.     WHAT IS A NETWORK:A computer network is simply a group of computers and or devises linked together. There can be various sizes of networks - from two computers in your home, to millions of computers on the Internet, and anywhere in between. An example of a two computer peer-to-peer network.
  11. 11.  Networks can include computers, servers, printers, file servers, as well as many other types of devises, as shown below.
  12. 12.     At least two computers Server or Client workstation. Networking Interface Card's (NIC) A connection medium, usually a wire or cable, although wireless communication between networked computers and peripherals is also possible. Network Operating system software, such as Microsoft Windows NT or 2000, Novell NetWare, Unix and Linux.
  13. 13. Categories of Network Client-server:The term Client/server refers to the concept of sharing the work involved in processing data between the client computer and the most powerful server computer. Peer-to-Peer:In peer-to-peer networking there are no dedicated servers or hierarchy among the computers. All of the computers are equal and therefore known as peers. Normally each computer serves as Client/Server and there is no one assigned to be an administrator responsible for the entire network.
  14. 14. LAN – LOCAL AREA NETWORK : LANs are networks usually confined to a geographic area, such as a single building or a college campus. LANs can be small, linking as few as three computers, but often link hundreds of computers used by thousands of people.  MAN – METROPOLITAN AREA NETWORK : MAN is a network over a larger geographical area such as the Provincial Government..  WAN – WIDE AREA NETWORK :WAN is a network over an extremely large geographical area such as simple as a modem and remote access server for employees to dial into, or it can be as complex as hundreds of branch offices globally linked using special routing protocols and filters to minimize the expense of sending data sent over vast distances. 
  15. 15.       What is connectivity/Interface:A generic term for connecting devices to each other in order to transfer data back and forth. It often refers to network connections, which embraces bridges, routers, switches and gateways as well as backbone networks. Different types of cables are also use to transfer data such as Fiber channel Twisted-pair Optical-fiber