Networking Continued
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Transcript Networking Continued
Networking Continued
Dr. Mahdi Nasereddin
Analog Vs Digital
Analog:
A continuous electrical wave
Make frequency
Used in the telephone wire
Digital:
Individual electrical pulses that represent the
bits grouped together into byte
Used Binary number (0,1) in computer
How a Modem Works
-The word modem comes from the terms
modulation and demodulation
-A device that switches electronic signal from
digital to analog or from analog to digital
Modulation
Demodulation
Networks Near and Far
There are two general types of computer
networks:
LAN
(Local Area
Network)
WAN
(Wide Area Network)
LAN (Local Area Network)
A LAN is a network in which the
computers are physically close to each
other
They typically share peripherals
(printers and servers)
Each computer and shared peripheral is
a node on the LAN
A LAN might contain PCs with different OSs
WAN (Wide Area Network)
A WAN is a network in which the computers
are a great distance from one another
Connections are made via telephone lines,
satellites, and/or microwave relay towers
Each network site is a node
Example: The internet
WAN (Wide Area Network)
WANs are often made up of LANs
Internet
AKA the Net
A worldwide collection of Network
Link millions of business, government agencies,
educational institutions, and individuals
Business Internet
Intranet Vs. Extranet
Intranet
an internal network that uses
Internet technologies
A private network
Make company information
accessible to employee and
facilities
Extranet
A similar to Intranet
To facilitate communication
and trade between an
organization and business
partners
allows customers or supplies
to access part of intranet
World Wide Web Consotium(W3C)
In 1994, found an organization by Tim Berners-Lee
Make the Web University accessible
Included (Extensible) Hypertext Markup Language
(XHTML), Cascading Style Sheet (CSS), Extensible
Markup Language(XML)10
Provides extensive resources on Internet and Web
technology
http://www.w3.org
The website has several good validation tools