Networking Continued Dr. Mahdi Nasereddin.

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Presentation transcript:

Networking Continued Dr. Mahdi Nasereddin

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

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 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