BASIC CONCEPT
 ARCHICTECTURE
 TOPOLOGY
NETWORK
A COLLECTION OF COMPUTER AND MOBILE DEVICES CONNECTED TOGETHER VIA COMMUNICATION DEVICES AND TRANSMISSION MEDIA, OFTEN WIRELESSLY ALLOWING TO SHARE RESOURCES
COMMUNICATION DEVICE
HARDWARE COMPONENT THAT ENABLES A COMPUTER TO SEND AND RECEIVE DATA, INSTRUCTIONS, AND INFORMATION TO AND FROM ONE TO MORE COMPUTERS
 TRANSMISSION MEDIA
THE MATERIALS OR SUBSTANCE CAPABLE OF CARRYING ONE OR MORE SIGNAL
MODEM
WIRELESS ACCESS POINT
ROUTER
HUB
SWITCH
NETWORK INTERFACE CARDS
PHYSICAL:
TWISTED-PAIR CABLE
COAXIAL CABLE
FIBER OPTIC
WIRELESS:
INFRARED
MICROWAVES
CELLULAR RADIO
BLUETOOTH
      
ADVANTAGES OF NETWORK
 DISADVANTAGES OF NETWORK
HARDWARE SHARING :
NETWORK FACILITATE THE SHARING OF HARDWAREE DEVICES SUCH AS PRINTER
INTERNET ACCESS SHARING :
SMALL COMPUTER NETWORKS ALLOW MULTIPLE USER TO SHARE A SINGLE INTERNET CONNECTION
 UNDESIRABLE SHARING :
VIRUSES ARE EASILY SPREAD OVER NETWORK AND THE INTERNET
SECURITY ISSUES :
A COMPUTER HACKER CAN GET UNAUTHORIZED ACCESS BY USING DIFFERENT TOOLS