This week was all about the transport layer.
UDP and TCP protocols live on the transport layer. If you are running a game and need to send player information updates between the client and server as fast as possible you're going to use UDP. TCP on the other hand is more reliable and bounces back and forth between two hosts to ensure the data is sent properly. So this layer is what you can use to build higher level protocols for your applications.
I haven't done a lot of programming at this layer so I enjoyed the labs this week going more in depth examining packets used for DNS. It is interesting to see how data moves through the transport layer to implement these higher level protocols.
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