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Packet Routing

Packet Routing. Lesson Objectives: Understand how data is sent though a network Know the different parts to a packet. How is data sent through a network. This is what happens when you try and send data as one big lump through a network!!. How do we stop blockages?.

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Packet Routing

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  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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