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LU4: COMPUTER TECHNOLOGY IN COMMUNICATION (TYPES OF NETWORK (AREA OF…
LU4: COMPUTER TECHNOLOGY IN COMMUNICATION
TYPES OF NETWORK
NETWORK ARCHITECTURE
- configuration of computer, devices & media on network
CLIENT/SERVER
act as server(host computer)
access to the hardware, software and other resources
clients/other computer can request service
provided centralized storage area for programs, data, information
10 or more computer
PEER TO PEER
each computer on network is called peer
all computer have equal responsibilities & capabilities
fewer than 10 computer connected
AREA OF COVERAGE
1. PERSONAL AREA NETWORK (PAN)
individual's workplace using wired & wireless technology
device connected via bluetooth, WIFI, Infrared/cables
2. BODY AREA NETWORK (BAN)
type of PAN that wirelessly connects sensors that placed in human bodies
body sensor network (BSN)
3. LOCAL AREA NETWORK (LAN)
limited geographical area
eg: home,school, office, buildings
both wireless and wired
4.wireless LAN
not use cables
can communicate with wired LAN and wireless
5. METROPOLITAN AREA NETWORK (MAN)
high speed LAN (town/city)
one or more LANS & WLANS
covers small geographical area than WAN
6. WIDE AREA NETWORK (WAN)
large geographical area
eg: city,state, region, country, world
long distance of transmission data
largest WAN: INTERNET
NETWORK TOPOLOGY
- mixed & match topology: hybrid topology
tree, star, bus, ring, mesh
INTERNET
-network
WORLD WIDE WEB
- electronic documents,service on the internet
why we use internet? - access information, send/post messages, communicate with friends and family
NETWORK
set of devices (nodes) connected by communication device and transmission media
node= computer, printer
COMPUTER NETWORK
HARDWARE=access points, routers, cables
SOFTWARE=OS, application
DIGITAL COMMUNICATION
two or more computer or device transfer data or information
involves cables/wires
5 DIGITAL COMPONENTS
SENDER=device that starts instructions to transmit message
RECEIVER=device that accepts transmitted message
MESSAGE=data/information (text,audio,video, picture)
MEDIUM=physical path/communication channel
PROTOCOL=set of rules that govern the communication for both sender/receiver
communication standard & protocol
STANDARD
the way computer access the medium- types of medium used
-speed of networks
types physical cable/ wireless technology used
eg:ethernet, token ring, WI-FI, long term evolution (LTE), ultr-wideband, infrared data association (irDA)
PROTOCOL
data format, coding schemes, error handling , data transfer sequences
eg: transmission control protocol/ internet protocol (TCP/IP)
bluetooth,RFID, near field communication (NFC)