cpt 123 internet skills class notes internet services session b
Post on 18-Jan-2016
216 Views
Preview:
TRANSCRIPT
CPT 123 Internet Skills
Class NotesInternet Services Session B
CPT 123 Internet Skills
GopherBrowsing service for use on the
InternetOne of the earliest servicesPopular for several reasonsFirst widespread browsing serviceMany sites ran gopher servers
CPT 123 Internet Skills
Provided access to large quantity of information
Popular among novice and non-technical Internet users because the interface was intuitive and easy to use
User did not need to remember commands to use gopher
CPT 123 Internet Skills
Popularized menu-driven approach to information browsing
Displays a menu of choices for the userEach menu item is a short, self-
explanatory phraseEach item on a menu contains a hidden
reference to additional information
CPT 123 Internet Skills
Additional information can correspond to data in a file or to another menu item
After menu is displayed, the browser software waits for the user to read the menu and select an item
If hidden reference points a data file, browsing software obtains a copy of the file and displays its contents
CPT 123 Internet Skills
If hidden reference points to another menu, the browsing software obtains the new menu and displays it, and waits for the user to make another selection
CPT 123 Internet Skills
If hidden reference points to another computer system, the browsing software jumps to the other computer system and displays a menu from that system
CPT 123 Internet Skills
Wide Area Information Servers (WAIS)Similar to Gopher, service provides
one user interfaceWAIS program worries about how to
access information of multiple databases
CPT 123 Internet Skills
User get a menu of documents ranked according to how relevant the server thinks it is to the user’s search
Like Gophers, WAIS client programs can be found on many public access Internet sites
CPT 123 Internet Skills
Internet Relay Chat (IRC)A program that lets you hold live
keyboard conversations with people around the world in real time
Each communication occurs on a separate “channel”
A user can create a channel and choose a topic
CPT 123 Internet Skills
The user specifies whether the channel is open to anyone or restricted to the set of people specified by the channel creator
A user can request a list of IRC channels currently in progress and join one of the channels
User selects an alias that the IRC uses to identify the user to others
CPT 123 Internet Skills
Participant receives each line of text that another participant enters along with participants alias
A participant knows that all other participants will receive a copy of the text on their screens
CPT 123 Internet Skills
MUD, MUCK, and MUSE GamesMultiple-User Dimensions or
Dungeons (MUD) are live, role-playing games in which the user enters, assumes a new identify, and enters an alternate reality through the keyboard
CPT 123 Internet Skills
You explore this alternative reality through a series of simple commands
You run across other users who may engage you in a discussion, enlist your aid in a quest, or try to kill you for no apparent reason
CPT 123 Internet Skills
MUCKs and MUSEs are games related to MUDs
You may be required to apply in advance for a character name and a password
Along with these Classical Board Games which are interactive can also be found on the Internet
CPT 123 Internet Skills
NetfindNetfind is a service that uses finger
and e-mail to locate a personUser enters the name of an
individual and information about the organization for which the individual works
CPT 123 Internet Skills
Netfind consults a list of organizations to obtain the address of a computer at the organization
Then it invokes the finger service at that computer to obtain information about that individual
CPT 123 Internet Skills
The finger program contacts a server on a remote machine to obtain information about a specific user or all user on that machine
Although designed to provide information about users, finger has been extended to locate a given userid at a given computer
CPT 123 Internet Skills
TalkTalk provides interaction between a
pair of usersTalk establishes a connection
between computers and divides the display screens in half
CPT 123 Internet Skills
What the user types on the keyboard appears in the upper half of the user’s screen and in the lower half of the remote screen
Talk sends each keystroke as soon as a user presses the key, so two people can read instantly what the other person types
CPT 123 Internet Skills
TracerouteUsers who are interested in the
structure of the Internet can run the traceroute program
Given the name of a remote computer, traceroute prints the list of Internet routers along the path from the local computer to the remote computer
CPT 123 Internet Skills
Although traceroute was intended for use when installing and maintaining Internet connections, it is interesting to see how many routers separate your computer from a given destination computer
CPT 123 Internet Skills
World Wide Web (WWW)This service is the hottest thing on
the Internet currently
top related