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School/Analyse/IPV4.md
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@ -20,5 +20,15 @@ Packets are encapsulated in data link frames (Ethernet)
## Fragmentation ## Fragmentation
Mostly, data link frames are smaller in size than IP Packets Mostly, data link frames are smaller in size than IP Packets
So the IP Packet does not fit in the data link frame.
In these cases the packet is split up into multiple parts (fragments) and each fragment is send in a separate frame. In these cases the packet is split up into multiple parts (fragments) and each fragment is send in a separate frame.
![[packet-fragmentation.png]]
The receiver host then combines all fragments before using them
Therefore the receiver should know which part of the message each fragment belongs (hence the fragment offset field in IP header)

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