Textbook Notes (368,780)
Canada (162,164)
CIS 1000 (58)
Zoe Zhu (26)
Chapter 3

chapter 3

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Computing and Information Science
CIS 1000
Zoe Zhu

Chapter 3 Using the InternetMaking the Most of the Webs Resources History of the Interneto Developed for secure military communications o Evolved from Advanced Research Projects Agency Network ARPANET o Funded by the US government in the 1960s o Enabled computers at leading universities and research organizations to communicate with each otherScientists were asked to come up with a solution to secure communications between large computer centers in case of a nuclear attack They responded by inventing packet switching and routers By taking data messages and breaking them into small packets each packet could be addressed and sent individually to a destination through a series of routers The routers would send each packet along the optimum path to the next router depending on traffic and availability The Internet is a network of networks that utilizes a common communication protocol so that computers from different manufacturers can communicate Today we cant imagine life without the Internet It is the way we communicate shop research entertain and express ourselvesThe Web vs the Internet o The Web is part of the Internet distinguished byo Common communication protocolso Navigation links o 1989 Web invented by Tim BernersLee o 1993 Mosaic browser released o 1994 Netscape Navigator marked beginning of the Webs major growth o 1997 Internet access was globalThe Web is only one component of the Internet the means we use to access information over the Internet hence the www at the beginning of Web addresses Other components of the Internet include FTP Gopher Telnet and BitTorrent which will be discussed later in this chapter What distinguishes the Web from the rest of the Internet is its use of Common communication protocols enabling different computers to talk to teach other and display information Special links called hyperlinks enabling users to navigate from one place to another on the Web The Web was invented long after the Internet in 1989 by Tim BernersLee at CERN in Switzerland In 1993 the National Center for Supercomputing Applications NCSA released the Mosaic browser Netscape Navigator heralded the beginning of the Webs monumental growthInternet Communications o Emailo Instant messagingo Group communicationo Social networkingo Web logs and video logso Wikiso Podcastso WebcastsForms of Internetbased communication include Email Instant messaging Voice over Internet Protocol VoIP Group communication such as chat rooms newsgroups listservs and social networksEMail o Electronic mailo Asynchronous communicationo Types of email accounts o Clientbased requires client email software o Webbased doesnt require softwareo Not private o Can be printed or forwardedo Employer can monitorEmail became the primary method of electronic communication worldwide because its fast and convenient Initially another attraction to email was that it reduced the costs of postage and longdistance phone calls Currently email is predominately the main means of communication in the business community For social exchanges email often offers a more private conversation away from the very public exchanges on social networks Lastly email accounts are necessary to join and then receive updates of activity on other Web sites With email the sender and receiver dont have to be available at the same time to communicate Some email accounts are clientbased and use programs such as Microsoft Outlook Clientbased systems are normally tied to a local Internet service provider ISP and use that domain for an address If a user changes ISPs his or her email address changes Webbased email on the other hand finds the messages at a host site received by and stored on a mail server and can be accessed from anywhere No special email client software is necessary A Webbased email address will stay the same no matter what ISP is used Free email accounts such as Yahoo or Hotmail use Webbased email clients Be careful what you say in an email message because it might come back to haunt youEmail Etiquette o Be concise and to the pointo Use spellchecko Avoid texting abbreviations
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