Transcript Introduction to Networking

Introduction to
Networking
Dov Rosenberg
What is a Network?

A network is a collection of
computers that can talk with
one another.

Networks can be made up of just two
computers, or millions of computers. The
Internet is the largest network.
Types of Networks

We use many different types of networks. For
example, schools and businesses usually have
their own private networks that can only be
accessed while in the building. This type of
network, known as a LAN (Local Area Network)
is sometimes referred to as an Intranet, but
most people just call them “The Network.”
Other Types of Networks

LAN- Local Area Network
 used
by schools and businesses
 used to connect around 10-500 computers in
a building
 only accessible from within the building

WAN- Wide Area Network
 networks
consisting of thousands of
computers or more, e.g. the Internet
Network Concepts

Network Hardware


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Servers- powerful computers dedicated to
controlling all of the systems on the network.
All networked computers are connected to
the server in some way
Printers- One of the reasons networks were
developed was to make a single printer
accessible by many different computers
Computers- individual machines that are
connected to the server
Network Interface Card (NIC)- a device that
is installed into a computer to give it a
terminal that can run a cable to access the
network
This is a NIC
Network Software

Network Operating System



the system software run on the server
An operating system (OS) is software that
computers use to run the environment that
allows you to access applications and create
files. Without an OS, a computer is useless.
Networked Applications



computer programs located on the network that
are accessed by individual computers
This makes loading software on individual
computers unnecessary.
A Program Launcher is a networked program
that allows you to open applications on the
network without searching for them.
OS Logos
Network Design

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Most networks today run on
Ethernet cables. Ethernet cables
are similar to phone cables but
are thicker with a larger
connecter. The Ethernet cable is
connected to the back of the NIC.
An Ethernet structure is built into
a building allowing computers to
connect to the network from
various rooms in the building.
Computers can also be connected to a network via a radio
transmission to and from a wireless hub that is connected
to the server.
TCP/IP stands for Transmission Control Protocol/Internet
Protocol

TCP/IP is a collection of protocols used to allow
communication between networks with different types of
computer systems. This allow Mac users and Windows users
to operate on the same network.
Troubleshooting

Network Problems

“I can’t get anything on the network to run.”


“I am out of disk space.”


Delete all unnecessary files on your home
drive.
“I cannot login to the network.”



Check to make sure that the cable in the NIC
is fully connected.
Make sure that your user ID and password
are correct.
Make sure that caps lock is not on.
“My computer won’t turn on.”

Check that the computer is plugged in and all
cables are connected properly.