Definition and Functions of Internet

Definition of Internet :

The Internet is a global system of interconnected computer networks that use the standard Internet Protocol Suite (TCP/IP) to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless and optical networking technologies. The Internet carries a vast range of information resources and services, such as the inter-linked hypertext documents of the World Wide Web (WWW) and the infrastructure to support electronic mail.

Functions of Internet :

1. Domain Name Service DNS
    

    Name Servers
    DNS Protocol Overview
    Resource Records RRs
    Theory of Operation

2. File Sharing
    

    NFS Protocol Overview

3. File Transfer
    

    FTP Protocol Overview
    TFTP Protocol Overview

4. Mail     

    a. Mail Format
        MIME Protocol Overview
        PGP Protocol Overview

    b. Transport
        SMTP Protocol Overview
        POP Protocol Overview
        IMAP Protocol Overview

5. Network Management
    

    Management Information Base MIB
    SNMP Protocol Overview

6. News

    
    News Message Format
    NNTP Protocol Overview

7. Publication
   

    a. Anonymous FTP
    b. Gopher
    c. World Wide Web
       -HTML Language Overview
       -HTTP Protocol Overview
       -Uniform Resource Locators
    d. Streaming Media

8. Remote Login

    RLOGIN Protocol Overview
    TELNET Protocol Overview

9. Routing

    Routing Tables
    Distance-Vector Routing Protocols
    Link State Routing Protocols
    Interior Routing
    Exterior Routing
    BGP-4 Protocol Overview
    OSPF-2 Protocol Overview
    RIP Protocol Overview

10. Security

      Trusted Ports
      SSL/TLS Protocol Overview
      SSH Protocol Overview
      IPSEC Protocol Overview
      Kerberos Protocol Overview

11. Session Management

      RPC Protocol Overview
      TCP Protocol Overview
      UDP Protocol Overview

12. Transport

      ICMP Protocol Overview
      IGMP Protocol Overview
      IP Protocol Overview

13. Windowing Systems

      X Windows Protocol Overview