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Internet servinternet_xl - Coggle Diagram

- - - - Electronic mail, E-mail
        
        It is probably the most widespread service on the Internet. There is always a simple and cheap way to communicate by e-mail. This service allows the exchange of electronic messages with any user of the Internet (and other networks). There are multimedia extensions (MIME) that allow you to send any type of information associated with a message: data, text, sound, images, etc.
      - Stakeholders, News
        
        This service can be used to create discussion platforms on a variety of topics, since it allows questions to be sent out into the world to be answered by someone, giving rise to virtual round tables.
        
        The service operates on a client-server model. Numerous programs exist for a user to act as a client, and to establish news sessions for both multi-user computers and personal computers.
        
        The most common operations are:
        
        Subscribe to the desired interest group(s).
        
        Select a group for consultation.
        
        Browse the headlines of the group's articles.
        
        Read, save or print selected articles.
        
        Send a reply or a new message to the group.
        
        Reply privately by e-mail to the author of a new article.
    - - Allows the client station to become a user terminal of the target machine, to use its utilities or access its data. Its use is usually restricted for security reasons.
        
        ¿What happens in the telnet client?
        
        A TCP/IP connection to the server is established.
        
        Accepts data from the local terminal (keyboard).
        
        Converts the local data to a standard format.
        
        Sends it over the network to the server.
        
        Accepts data from the server in a standard format.
    - - FTP applications offer a file transfer service, allowing the transfer of information (anything that can be stored in a file) between two computers.
  - - - Archie is one of the oldest search services that allows you to locate a program or document on the Internet, files, especially in "anonymous" FTP servers, returning information about where it is located, generating a database, so that it can be accessed later.
        
        Geographical distribution
        
        archie.rutgers.edu: NE USA
        
        archie.sura.net: SE USA
        
        archie.unl.edu: W USA
        
        archie.mcgill.ca: Canada
        
        archie.au: Australia
        
        archie.switch.ch: Europe
        
        archie.doc.ic.ac.uk: Europe
        
        archie.rediris.es: Europe
    - - This service is oriented to take a look at the resources available, rather than to search for something specific. It was developed at the University of Minnesota, and allows you to search for resources using menus and browsing inside computers, going through their directories, as if you were a gopher.
        
        How Gopher works:
        
        The user contacts his local server.
        
        The local server sends the menu.
        
        The corresponding menu item is selected.
        
        The server informs about the type of selection:
        
        Path to a file and host for FTP.
        
        Host and login for Telnet.
        
        Directory server.
        
        Other submenu
        
        The user saves his current state to return to it if needed.
        
        Gopher accesses the selected resource.
        
        Subsequently it is possible to return to the previous state. if it was saved. In many cases states can be stored stably.
- - - - The gateways, using their own protocol (within TCP-IP) are in charge of routing data packets. To do this, the memories of these machines store information related to the sub-networks that hang from all the other Internet gateways and, of course, from their own.
        
        Servers. These are the machines on which the applications of the different services that can be used on the Internet reside. For example: World Wide Web servers, e-mail servers, chat servers.
        
        DNS (domain name servers): Their function is to relate IP addresses to domain names.
        
        End users: By connecting to their servers, which are the Internet access providers, they form a local network.
        
        Client: These are the programs that reside on the end users' computers, and which, connected to the corresponding server, allow them to use the services that exist on the network.
- - - - company-company
      - company-consumer
      - company-administration
      - consumer-administration