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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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.”

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Client
Server
Networks
Connections/Interface

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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

5. 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

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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)

7. 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.

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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.

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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.

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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.

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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.

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Networks can include
computers, servers, printers, file servers, as
well as many other types of devises, as shown
below.

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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.

17. 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.

19. 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.
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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