Lesson 10 - Data Encoding

Data Encoding

Now in a network message is always travel in a transmission medium, every node send data to one another node. So if there is no proper method in a network to protect the message so it can be read by any one in a network. So thus to prevent this and to make network secure, the message is encoded or encrypted so no one other than an addressed receiver can read that message.

Here, the path of data signal is something like -

1. 1. Message send by - Sender end
2. 2. Go through Encoder - to encode our data, then its goes to,
3. 3. Transmitter - to transmit our data, and for transmission they need.
4. 4. Transmission medium - which helps data in moving, then its reaches to Receiver end.
5. 5. Decode - Here, data will be decode back to original form

And thus message reached to addressed node.

Formatting and Encapsulation of Data –

There is a format of everything, like when we write a letter to anyone then there is a proper format of writing letter (like content of letter, ending indication of letter and a signature of sender etc.) and then on an envelope we write our address (sender address) and a destination addressed (receiver addressed). So it goes to a right place. Similarly while sending message to anyone in a network there is a format like,

• 1. Sender location
• 2. Receiver location
• 3. Message content
• 4. Source identifier
• 5. Acknowledgement of receiving message.