1 networks and internet objectives understand basic concepts in networking network types understand...
Post on 21-Dec-2015
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Networks and Internet
Objectives Understand basic concepts in NetworkingNetwork Types Understand basic concepts in InternetInternet ServicesBecome familiar with Web terminologies
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Computer Networks
Physical part of the definition:–Two or more computers linked together.
Functional Part of the definition:
–Communication
–Sharing resources
–Exchange of data
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Computer Networks
Types of Networks Local Area Network (LAN) – nodes are in close proximityWide Area Network (WAN) – nodes of the network are geographically distantInternet – Network of networks and individual computers
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Going Online
The Internet Internet: worldwide collection of networks ARPANET: network for scientists that evolved into the Internet Internet backbone: major communications lines of the Internet
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Going Online
The InternetNo one group controls the Internet Three Major Organizations:
The Internet Society: Open development for the benefit of the public Internet Corporation for Assigned Names and Numbers (ICANN): Assign names and addresses World Wide Web Consortium (W3C): Creates technical specifications
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Going Online
Connecting to the Internet Bandwidth – amount of information that can be sent over the channel
56,000 bits per second (bps)9M (millions of bits, or megabits per second)
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Going Online
Connecting to the Internet Internet service provider (ISP): Colleges, Schools, Corporations, Communication companies ex. SBC Information service gateway: ex. AOL, MSN, CompuServe
communications software (Interface with their information system) user ID and password
Direct LAN connection T-1 line (1.544 Mbps) T-3 line (44.736 Mbps)
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Going Online
Connecting to the Internet Transmission Control Protocol/Internet Protocol (TCP/IP)
Protocol: set of rules for how computers communicate Packet: the part of a message that contains the data and the address the message is being sent to
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Going Online
Retrieving and Viewing Information on the Internet
Client program – Internet browser: runs on user’s computer Server program – runs on server computer
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Going Online
Retrieving and Viewing Information on the Internet
Domain name: name or abbreviation of the name of the organization Uniform resource locator (URL): address of a web page
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Going Online
Retrieving and Viewing Information on the Internet
URL access protocol domain name
top-level domains: denote affiliation.com .edu
folder filename
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Going Online
Internet Browsers Browsers
retrieve and view Internet-based information interact with servers download and upload information
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Going Online
Internet Browsers Web site pages home page – first page you see at a site hyperlinks – allow user to click on an icon and be taken to other resources on the Internet
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Going Online
Browser Plug-ins Plug-in – gives the browser added capabilities
Shockwave Player Flash Player RealJukebox Liquid Player
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Going Online
Internet Resources and Applications Finding information on the Web
browsing: just looking around searching: trying to find specific information
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Going Online
Internet Applications File Transfer Protocol (FTP) servers
easily download/upload files
Anonymous FTP sitesE-mailChattingOnline conferences