Networks and Communication Part B

Networks and Communication Part B

1. Internet

   • This is not the same as the WWW. The internet is the infrastructure to connect computers together across the world using external communication hardware
   • It uses the TCP/IP protocol for communication between devices
   • Once people are connected they can send emails, instant message, access the WWW and transfer files
     • Dedicated software is needed to use these services

2. Intranet

   • This provides the same services as the internet but it can be used only by those in the organisation, they will also most likely need a username and password
     • This intranet may be provided through as LAN or a virtual network within a WAN, only the computers part of the LAN or virtual network can gain access.
     • Uses the same TCP/IP protocol as the internet
   • It still has the same services such as e-mail, web pages, chat, file transfer but all internally
   • Software is still required
   • Means that users can safely transfer information without worrying about anyone outside the organisation. Meaning that the confidential information stays confidential

3. Extranet

   • The users of this have access to the internet services of the organisation
   • They can gain access by logging onto a secure server from a web page or some will provide secure software that the user can use
   • Only available for communication within the organisation, yet the employees can gain access from any internet connected device
     • This is useful for those who want to access the companies system and intranet, so that they can send an email when they are working away from the office
     • One disadvantage is that the extranet can be hacked as it is available from any internet connected computer