INTERNET TECHNOLOGY

 INTERNET TECHNOLOGY


WHAT IS NETWORK ?

          A network is a collection of computers and devices connected together via communications devices and transmission media.

COMMUNICATION DEVICE AND TRANSMISSION MEDIA

  

What is communication media ?

Communications device is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device.

Types of communication devices

• Dial up modem 

• Wireless modem

• Network card

• Digital modem(SDN,DSL and cable modem)

• Wireless access point

• Router

• Switch

• Hub

what is transmission media ?

Materials or substances capable of carrying one or more signals in a communications channel.

Two types of transmission media:

1.Physical transmission media/Guided media/Wired
•Twisted-Pair Cable, Coaxial Cable, Fiber-Optic Cable.

2.Wireless transmission media/Unguided media/ Wireless
•Infrared, Broadcast Radio, Cellular Radio, Microwave, communications satellite.



PHYSICAL TRANSMISSION MEDIA

Twisted pair cable

Coaxial cable

Fiber optic

WIRELESS TRANSMISSION MEDIA

Infrared

Broadcast radio (Bluetooth, Ultra Wideband(UWB), Wifi, WIMAX)











Cellular Radio











Microwave

Communication satellite

ADVANTAGES OF NETWORK

•Easy Communication and Speed

-People can communicate efficiently by using a network such as emails, instant messaging, telephony, video conferencing, chat rooms, etc

•Ability to Share Files, Data and Information

-It can benefit large organizations to maintain their data in an organized manner and facilitate access for desired people

• Sharing Hardware

-By sharing hardware it can reduce the cost of purchasing hardware because there’s no need to have individual  hardware such as printer for each and every computer in the company.

•Sharing Software

-It can reduce the cost of buying software by networking their computers because networkable versions of software are available.

         •Security

        -Sensitive files and programs on a network can be password protected and can only be accessed by the authorized users.

         •Speed

         -Sharing and transferring files within networks is very rapid, depending on the type of network.

         -This will save time while maintaining the integrity of files.

DISADVANTAGE OF NETWORK

•Breakdowns and Possible Loss of Resources

-Breakdown of the whole network due to an issue of the server may lead to loss of important data of the server.

•Expensive to Build

-Building a network  for large scale organizations are very pricey especially to buy and replace cables and other hardware .

•Security Threats

-There are hackers who are trying to steal valuable data of large companies for their own benefit.

•Bandwidth Issues

-Heavy users who consume a lot more bandwidth will affect other users.