Basics Of Network

Basics Of Network

Before we see how internet works first we can see what is an Internet.
so , what is Internet?

•    Simply we can say that internet is a  Inter Connection of large number of networks.

Now you may have a question , what is a network?

• In simple term network can be defines as It is a Collection of nodes connected with each other through a wired( Fibre optic cable) or wireless (Radio waves)connection.
• Each network has a hub or switch and a router that transfer data to a another network.

Now you may have a question , what is a node and what is hub and switch?

• A node is any devices such as a Computer , laptop , mobile phones etc.
• A  router is a device which guides in sending the data packet from its source to destination i.e. from one network to another network.
• data packet sent from one node will be send through a switch or a hub to the destination node with in a particular network. 

So what is a packet?

• packet - as we use packets in our daily life it will hold something here it hold the data.
• example : you are sending hello message to your friend ."hello" is the data and it is put inside a packet and sent over the network.

You may now ask ,why we need a packet ,we can send data directly?

• The reason is that packet holds additional information in addition to the data(hello) .they are sender address ,receiver address,size of packet etc.

How Internet works.

• let assume you are sending a 'Hi' message to your friend in US.
• first the data 'Hi' is put in a packet with your friends address(Destination Address) .
• The switch Checks whether the destination address is in your network is so the switch will redirect the packet to the destination.else it forwards the packet to router and the router look at the destination address and forward packer to that respective networks router then it sends the packet to the corresponding network switch and then it send the packet to the destination(your friend receives 'Hi' message).

Note:We can discuss about destination and source address ,routing some other details in next post .

If any doubts ask in the comment section below...Thank you