CPT 123 [299] Internet Skills Overview of the Internet Session One Class Notes DMWilliamson 1998
Jan 12, 2016
CPT 123 [299] Internet Skills
Overview of the Internet
Session OneClass 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 WWWDefine a URL and give specific
examplesDescribe how to enter a URL
address in a browser
Objectives
Define a hyperlinkExplain 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 communicationThree Basic characteristics
Immediacy, Two-way nature, and Global nature of medium
Internet Services
E-mailMost commonly used Internet service.Allows exchange of electronic messages
among users.Multi-platform environmentSome mail applications allow attachments
with electronic messagesAn 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 formatuserid@[email protected]
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
Internet Services
E-mail 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