Uses of computer communications

• cybercafe
• voice mail
• GPS
• wireless messaging services

Network

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

˜Advantages of a network include :

• Facilitating communications
• sharing hardware 
• sharing software
• sharing data and information 
• transfer fund

Type of networks 

1. LANS
2. MANS 
3. WANS

Network Architecthures

Client/server 

• One or more computer act as server
• Server - control access to network
• client - other computer that rely on the server for it resources

Peer to Peer

• inexpensive computers that connect fewer than 10 computers
• each computers has responsibilities and capabilities , sharing resouces with other computers .

Network Topologies 

Network topologies refersn to the layout of the computers and devices in a communication network 

1. star network

all of the computers device connect to a central device

     2. bus network

Consists of a single central cable, which all computers and other devices connect

     

     3.ring network

A cable forms a closed loop (ring) with all computers and devices arranged along the ring

Networks

• An intranet is an internal network that uses Internet technologie
• An extranet allows customers or suppliers to access part of its intranet 

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