social networking in plain english video
Networking and digital communication
-Artur C. clarkes prophesy: it a scientist says that some thing is possible he is right but if he says that it is not then he is wrong
-he predicted the use of geostationary communication satellites
comp network: system of 2 or more comp. linked together. helps in communication etc
LAN : comp close to each other, local,
-each comp is a node on a network
wireless network: each node has a tiny radio to connect it to the network/
MAN: link s many lans
WAN: extended over large distances
routers: hardware tat route messages as they travel between networks
GPS: global positioning system
024 satellites that go around the earth and give us info
-a network not connected to the internet
ATM: Automated teller machine: special terminal linked to banks computer
network interface card:
-adds additional serial port
-direct network connection
-controls data transfer from ram to network cable
Modem: connects computer port to phone line
transition speed is in bps )bits per second)
computer send s digital signal
modem converts the signal from digital to analog and vice versa
Broadband connection: connection with much greater bandwidth
-DSL, cable modems,high-speed wireless, satellite dishes
fiberoptic connection: better than DSL and cable modems. substitute copper wires. uses speed of light.
wire less: lightning fast connection is useless if you are away from your desk most of the time
fastest growing wireless tech is wi-fi (for lan)
blue tooth allows many device up to 30 ft can communicate with each other
-possible to create a personal area network
possibilities:
-pacemaker and calling 911
- pen scans business cards and sends info to PDA in brief case
-wrist band that gives info of accident victims to the doctor
-phone tells you sales in store for clothes your size as you walk by it
Communication softwares: establishes protocols by hardware
NOS: systems handles communication between workstations
peer to peer
Networks: share hardware ex. printer
Softwares: file servers
people : groupware
Email: send and receive messages through networking uses ASCII code
some don't always show HTML. but risk of web bugs. Mailing list help you subscribe to sites and get info in your inbox
newsgroup; get daily info. there are moderators
asyncronous communication: sender and receiver dont have to be on at the same time
IM : real-time , need to be on a t same time
computer telephony integration: link comps and phones for better
VoIP: use Internet to make voice calls. easy, less expensive
disadvantage: no 911 services, dont work in black out
-no quality guarantee
Social networking: twitter, facebook
Emails problems: spam, junk mail, security, threat to privacy, vulnerable to machine failures
cookies: can be used by snoopers to get info about you
wireless: issues of access, security, privacy
many services will be taken over by digital delivery systems
telecommunication is changing
summary:
LAN: comps are close together, have radio transmitters
WAN are more distant
Computers are connected together by the internet
most comp use Ethernet
wireless revolution is far from over.
