CPT 123 [299] Internet Skills Overview of the Internet Session One Class Notes DMWilliamson 1998

Objectives  Describe the Internet and its history; and explain how to access the Internet  Describe the WWW in context of hypertext and hypermedia  Distinguish between a Web server and a Web client

Objectives  Distinguish between HTTP and HTML  Use a browser to access the WWW  Define a URL and give specific examples  Describe how to enter a URL address in a browser

Objectives  Define a hyperlink  Explain why hyperlinks within a document appear in two different colors  Describe the various buttons on a browser  Explain how to create a bookmark

Overview of Internet  The internet is a network of networks that connects computers across the country and around the world

Overview of Internet  Begun in 1969 to test the feasibility of a wide area computer network (WAN) over which people could share data and messages

Overview of Internet  Grew out of DOD experiment  No central authority  Each computer attached to the network (node) is equal to all others

Overview of Internet  Originally known as ARPAnet which consisted of four computers  Today the Internet includes millions of computers worldwide  Brings a worldwide library of on-line information resources concerning a myriad of topics to anyone who has connectivity to the Internet

Overview of Internet  Primary capabilities are information retrieval and worldwide communication  Three Basic characteristics  Immediacy,  Two-way nature, and  Global nature of medium

Internet Services   Most commonly used Internet service.  Allows exchange of electronic messages among users.  Multi-platform environment  Some mail applications allow attachments with electronic messages  An address of the message recipient is the major thing one needs to send electronic mail

Internet Services  Recipient’s address is usually the userid on the system, if system permanently attached to Internet or a user ID on an Internet Service Provider’s (ISP) system that holds mail until the user connects or requests mail.  Example format  

Internet Services  Some mail applications allow the establishment of mailing lists or aliases for groups of Internet users  Mailing lists or group aliases are similar to bulk mailings  Electronic message is addressed to list and mailer routes the message to each user on the mailing list  Example 

Internet Services  messages arrive at the mail server from a remote PC or from a node on a LAN.  The message then leaves the local mail server and travels through a router (a special purpose computer) that ensures each message is sent to its correct destination.  The mail message will pass through several networks to get to its destination.

Internet Services  Each network has its own router that determines how best to transmit the message closer to its destination.  The network router considers the traffic on the network.  A message passes from network to network until it arrives at the destination network.  The message is then sent to the recipient, who has a mailbox on that network.

Internet Services