2.1 The estructure of a data packet

As same as the small door, the internet cables and radio wave have a bandwidth, which is like the size of the door.

The Problem of Large Files

The bandwidth limits the amount of data that can be transfer through internet.

The Problem of Large Files

The data in a file to be transmitted, it is broken down into very small units called packets.

Solution: Breaking Data into Packets

Each packet of data contains three different sections:

Solution: Breaking Data into Packets

Packets

All devices connected to the internet have an IP address.

Knowing a device's IP address is like knowing its location. This allows you to send information to that specific device.

Destination address

Go to the start or press the Windows Key.
Type "cmd" and press Enter key to open the command line.
Type the command > ipconfig
Check your IP address with your classmates.

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Each data packet in the file is given a packet number

Packet Number

The originators or the source address is also normally an IP address.

Originators address

The actual data

Payload

The actual data.

"Hello, What's up?"

Payload

Two pieces of information:

1. Marker to indicate that it is the end of the packet.
2. Data for error detection.

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