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Understanding Data Transmission Through Packet Routing**

This lesson covers the fundamentals of how data is transmitted across networks using packet routing. You will learn why data cannot be sent as a single large block and how it is instead divided into smaller packets to prevent blockage. Each packet contains essential components, including addresses, grouping information, position, and hop counts. We will explore the maximum size of packets and how lost packets can be managed through retransmission requests. Gain insights into the journey of data as it hops from one device to another in a network.

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Understanding Data Transmission Through Packet Routing**

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Presentation Transcript

  1. Packet Routing Lesson Objectives: Understand how data is sent though a network Know the different parts to a packet

  2. How is data sent through a network • This is what happens when you try and send data as one big lump through a network!!

  3. How do we stop blockages? • To stop the network to blocking up due to large amounts of data, the data is split into smaller blocks • The blocks are called Packets 750 KB 750 KB 3 MB 750 KB 750 KB

  4. What’s in a packet? • There are a number of things a packet has to have: • Address = Where it’s going e.g. 172.135.0.3 • Group = the group of packets • Position = Where it comes in the group • Hops = How many hops between routers its taken (More on this later) Trailer Header Content Position Address Group Hops Between 500 KB and 1MB

  5. Challenge • A packet has a maximum size (fixed) of 750 KB. • Header is 145KB • Trailer is 45KB • You are trying to send an email that is 3450 KB • How many packets would need to be made and then sent?

  6. A network • How does a bit of data get from one Device A to Device B?

  7. Lost Packets • There is a little bit of a weak link with this system • What happens if the pack never gets to Device B? This is where the magic happens!!! • Every time a packet hops from one switch to another the packet “hop counter” decreases by 1. • The packet has about 100 hops before its destroyed • If the end device doesn’t receive the packet it will request another one.

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