Download powerpoint

Unit 5 Introduction to
Networking
• Group of computers connected together in such
a way as to allow resources to be shared.
• What do you know about networks?
• Describe a network – what are components?
• Compare a stand-alone PC to a network PC.
• Two or more computers that are linked together
in order to:
• share resources (such as printers and CD-ROMs)
• exchange files
• allow electronic communication.
•
•
•
•
Cables
Telephone lines
Fiber Optic (visible light)
Radio waves (WiFi - Wireless
local area network that uses
radio signals to transmit data)
• Satellites (GPS)
Cables
Network Interface cards
Modem
A device that allows computers
to communicate over telephone
lines
A card installed in a computer
that allows you to connect to a
network (can be Ethernet,
telephone, or wireless)
Switches
Hubs
like a tiny telephone
company that lets pairs of
devices make direct
connections.
simply connects all of the
devices on its ports
together
Router
Server
a device that transfers
data from one network to
another in an intelligent
way
computer or device on a
network that manages
network resource
• LAN
• MAN
• WAN
• Local Area Network
• Confined to a relatively small area
•Generally limited to the same building
• Computers can be no more than a mile apart
• A file server – stores all of the software that
controls the network, as well as the software
that can be shared by the computers attached
to the network
• A workstation – computer connected to the file
server
• Cables – used to connect the network interface
cards in each computer
• Metropolitan (Metro) Area Network
• Covers small geographical areas, such as
cities
•Often used by libraries and government
agencies to connect to citizens and private
business industries
• Wide Area Network
•Connects larger geographical areas
•Examples include: RCSD and Internet
• Each ICT I lab and ICT II lab have switches in them that
control the data that flows in and out of the lab.
• There is a hub switch in all the ICT II labs. The cable from
each lab’s switch plugs in to a port on the hub switch. The
hub is connected to the ICT server which is located in the
main office.
• The ICT server is connected to a router that gives us
access to the Internet.
• All of the computer labs & all of the individual computers
in other classrooms make up the OGMS LAN.
• Mrs. Lanyon’s lab, Mr. Lee’s lab, and Mrs. Weathersby’s
lab (and all of the ICT I labs) are considered LAN
segments because the computers in each lab are
connected together in a kind of smaller network.
• The computer workstations in each ICT I lab and each ICT
II lab are connected by ethernet cables. The cables plug
into the network card in each computer.
• The main server at OGMS is connected to the
main server at the county office.
• All of the schools in the Lamar County School
District are connected to the main server in the
technology building at Jefferson Todd which
makes LCSD a WAN.