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• A network consists of computers connected to each other through another type of special computer called a router.
  • A router can be connected to other routers to further increase the amount of connected computers.
  • It is responsible for sending information to the correct computer in a network!
• But how do we connect to networks that are outside our area of networks? Connecting to networks far far away?
  • Since our telephone line is used to connect one home to any home in the world, we can use this system of connection.
  • We can attach our routers (with connected computers) to a modem that uses our telephone line!
• In order to send messages from one network to another, we need to connect our network to a ISP (Internet Service Provider).
  • This company manages special routers that have connections to other ISP's routers.
  • Our message is sent through a network of ISP's!
• Computer A -> Router A -> ISPA ....other ISP's.... -> ISPB -> Router B -> Computer B

Specifying the computer to send information to

• Any computer linked to a network has a unique address that identifies it!
  • This address is called a IP address (Internet Protocol)
  • Address contains a series of 4 numbers separated by dots: 192.168.2.10
• To make this easier for us to read, as humans: we can alias our IP Address to a domain name. For example, google's IP Address is 173.194.121.32 and its domain name is google.com
• The internet is an infrastructure of computers connected together, the web is a service built on top of the internet (which uses special computers called web servers to send messages to browsers)