1. Networking Continued
Dr. Mahdi Nasereddin

2. Analog Vs Digital Analog: Digital: 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

3. 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

4. Networks Near and Far
There are two general types of computer networks:
LAN (Local Area Network)
WAN (Wide Area Network)

5. 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

6. 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

7. WAN (Wide Area Network)
WANs are often made up of LANs

8. Internet AKA the Net A worldwide collection of Network
Link millions of business, government agencies, educational institutions, and individuals

9. Business Internet Intranet Vs. Extranet
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

10. 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
The website has several good validation tools