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How the Internet Started The ARPANET, created in 1969,
connected computers at UCLA, Stanford, University of Utah, and University of California at Santa Barbara.
Then, the military liked the idea for distributed decision centers.
Today, the Internet connects computers all over the globe and supplies information to people of all ages and interests.
The Internet is not owned or operated by any single corporation or government.
The Internet is based on a network of networks.
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IP AddressesStatic IP address – permanently assigned
IP address
Dynamic IP address – temporarily assigned
An IP address is a series of numbers, such as 204.127.129.001It is separated into four sections by
periodsEach section’s number cannot exceed 255
Domain NamesPeople find it difficult to remember long
strings of numbers, so host computers also have names called domain names
Domain name – “fully qualified domain name” (FQDN), usually typed in all lowercaseKey component of URLs and e-mail
addressesLallylab2.mgmt.rpi.edu/mis
lallylab2.mgmt.rpi.edu is the domain name (128.113.9.243)
Registering a Domain Namehttp://www.google.com/a/cpanel/domain/ne
w
http://www.register.com/
http://smallbusiness.yahoo.com/domains/
TCP - IPTransmission Control Protocol (TCP)
Breaks messages into packets and specifically into octets (eight bits) reliably and in the correct order.
Internet ProtocolAddresses packets from one computer to
another.
Internet StatisticsWorld Statistics
http://www.internetworldstats.com/stats.htm
Language Statisticshttp://www.internetworldstats.com/stats7.ht
m
Top 20 Countrieshttp://www.internetworldstats.com/
top20.htm
WWWList of www browsers
http://en.wikipedia.org/wiki/List_of_web_browsers
Web Server Statisticshttp://news.netcraft.com/archives/
web_server_survey.html
FTP – File Transfer ProtocolBasic Facts
http://en.wikipedia.org/wiki/File_Transfer_Protocol#Software
FTP Clientshttp://en.wikipedia.org/wiki/
Comparison_of_FTP_clients
Email ServersList of email servers
http://en.wikipedia.org/wiki/Comparison_of_mail_servers
SMTP – POP protocols
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DSL, ISDN, and Dedicated Lines
DSL is a high-speed, digital, always-on Internet access technology that runs over standard phone lines.
Chapter 6: The Internet13
Cable Internet ServiceCable Internet service distributes always-on
broadband Internet access over the same infrastructure that offers cable television service
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Intrusion AttemptsAn intrusion is any access to data or
programs by hackers, criminals, or other unauthorized persons
Looking for open ports is one of the most common ways of gaining unauthorized access to a network-based computer.
A port is associated with an IP address of the host computer.
A web port:http://lallylab2.mgmt.rpi.edu:80/mis/
A list of ports:http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
Port ScannersSoftware used by network administrators
and hackers to identify open ports of computers in the network.
http://www.radmin.com/products/previousversions/portscanner.php
IntranetsWhat is an IntranetTechnical AdvantagesBusiness AdvantagesService PlatformsIntranets in today’s economyMeasuring Intranet ROI
What is an IntranetIt is a private information systemBuilt on Internet technologiesClient-server system architectureBased usually on three-tier systemIt is not a telecommunications network
Technical AdvantagesEasy to learnFast to buildEasy to deployEasy to maintainEasy to updateEasy to personalize
Business AdvantagesCheaper than deploying traditional systemsShrinks distancesAdds to the company’s business
intelligence
Business AdvantagesCan link to other sources of information.Adds “time” to a company
Through document sharing (text, drawings).Online collaboration
Cheaper than deploying traditional systems.
Shrinks distances.Adds to the company’s business
intelligence.
Intranet Services PlatformMail serverWeb serverIndexing serverTransaction serverDB serverData Warehouse server