Transcript CIS 321 Data Communications & Networking

CIS 250
Advanced Computer Applications
Internet/WWW Review
Internet Review
Internet – global network of networks
 WWW – system of Internet servers
supporting specially formatted
documents
 HTML – Hypertext Markup Language



Language web documents are formatted in
Weather, sports, email, reference info,
entertainment, financial services and
much more!
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Connecting to the Internet

Three components needed
Communications capability (modem, LAN
connection)
 Internet Account/ISP
 Software

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Activities & Issues
Downloading – transfer from an outside
source to your computer
 Uploading – transfer from your computer
to another device



FTP programs
Vulnerabilities – viruses and worms

Antivirus programs
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Components of the Web
Web Server – stores
hypertext/hypermedia documents and
makes them available
 Web Client – PC or device used to
access files held on web servers
 Web Browser – software application
used to locate and display web docs

Netscape Navigator
 Internet Explorer

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Web Documents and Web Sites

Formatted in HTML
 Hyperlink tags used to link multiple HTML
docs together and to connect to other web
sites
 Web Page – one HTML document
 Web Site – collection of related web pages
 Home Page – main page of a web site; also
defined as the first page displayed when
you open your browser
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Addressing on the Web

Every device on a network has an IP
address

Unique 32-bit numeric address identifying a
specific device
Domain name address – text name
identifying one or more IP addresses (ex:
Microsoft.com represents about a dozen
IP addresses)
 Domain Name Addresses are translated
into IP addresses by a Domain Name

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URLs
Uniform Resource Locator – Identifies
document residing on a web server
 Parts

Transfer protocol (http or ftp)
 Domain name of host server
 Pathname (if applicable)
 File name of document

http://www.webopedia.com/TERM/U/URL.htm
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Elements of a Web Browser

Same program components as many other
apps
 Scroll bars
 Status bars
 Tool bar
 Home, history, back, forward,
reload/refresh, stop, favorites, address
line
 Save web pages to disk or send via email
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CIS 250
Advanced Computer Applications
Internet/WWW Review