Internet Structure

Internet Structure

1. Client

   • ISP
     • Point of presence
       • Server
     • Router got us to ISP

2. Defintions

   • Router is a piece of hardware that allows connection between two or more networks
   • ISP Internet Service Provider allows cost effective internet access
   • Client is a computer that uses the services provided by server
   • Server is a program or computer that exists purely for use of clients all info goes through server
   • Internet protocal is whats used to route packets of info to be sent through the internet.
   • Connecting backbone links all the major interent servers together.
   • TCP Transfer Control Provider takes data form clients application and sends it to IP.
   • FTP File transfer protocal. Allows files to be transfered to two different clients through the use of a TCP Server.
   • POP Point of Presence acts as a door to the server. Usually needs to authenticated and accessed through the use of a Password or Firewall.
   • NAP Network access protocal allows interchange and connection between two or more ISPs
   • Bandwidth is a measure of a servers data capacity. Measures in bits per second

3. Client

   • ISP
     • NAP
       • Allows connection between ISP
     • router also links us here

4. Different types of connection

   • Wireless- Using a wirelss access to a server
     • Advantages-A mobile system. Can be used anywhere where there is wi-Fi and is very convenient
       • Disadvantages- Can only be used where there is Wi-Fi. Can be less secure than wired connection and tends to have slower transmission
   • Broadband-wired connection to a server
     • Advantages-Better reception. You have instant internet access and is usaully faster than dial up.
       • Disadvantages-Requires a base so it is less flexible
   • Dial Up-Connection to the internet via a telephone line which neeeds a modern to convert to and from transmissions
     • Advantages-Low cost. Easy setup as there is simple and easy equipment and can be existing telephone lines

5. VOIP

   • Voice Over Internet Protocol
   • Used to send files,Free video calling and calls to anywhere in the world
   • Google offers VOIP
   • Skype is an example of VOIP
     • You speak into a micorphone that is connected to a sound card. The sound card has a analogue to digital converter that translates your speech into a digital steam. The data is given a destination address and off it goes along with any other data stream. The receiving computer has the right VOIP software to convert the incoming data back to speech.
     • You would use it to connect with other people and send them files. It is also profoundly inexpensive
     • Limitations to Skype. 1.Both ends have the right software and hardware to speak to one another 2.If it uses packet switching so the pockets get dropped along the way so will the voice quality
       • Benefits to skype. At its most basic the system is essentially free as long as both parties have internet connection. They may offer a free services if you call different other subscribers.