� Speed � Accuracy � Efficiency � Versatility � Storing and Retrieving
Hard Disk, Floppy Disk, Magnetic Tape
USB flash drive, Memory card
PS/2 ports, Audio ports , Para ...... rt , RJ 45 port , Serial ports
Transmitting data and information is called data communication.
Sender / Source, Medium, Receiver/ destination
Simplex Mode, Half- duplex Mode, Full Duplex Mode
Guided / Wired, Unguided/Wireless Media
If the medium used for data tr ...... it is called guided or wired.
Twisted Pair, Coaxial Cable, Fiber Optics cable
� Super Computers � Mainframe Computers � Mini Computers � Micro Computers
Data is transmitted as signal ...... alled unguided/wireless media.
Radio waves, Microwaves, Microwaves
Network Interface Card (NIC), ...... Wi-Fi, Router, Modem, Firewall
Local Area Network (LAN), Metropolitan Area Network - (MAN), Wide Area Network - WAN
Star Topology, Bus Topology, Ring Topology, Tree Topology, Mesh Topology
Data and information can be sh ...... d at any time, Electronic mail
Possible security issues, Brea ...... k downs, Training requirements
� Analog Computers � Digital Computers � Hybrid Computers
� Input data � Process and store data � Output data
� Keyboard � Pointing Devices ...... ler Machine - ATM � Microphone
� Monitor/ Screen o Cathode Ra ...... rs o Thermal printers � Sounds
� Arithmetic and Logical Unit (ALU) � Control Unit (CU) � Memory Registers
The memory that can be directl ...... ly Memory (ROM) o Cache Memory
Secondary Memory or the Second ...... also called External Storage.