CST311 Module 3

 This week we primarily looked at the transport layer -- with protocols such as UDP and TCP. Overall between the two of them, it seems as though TCP is used most often due to a couple of its features but UDP still has it place in the internet. TCP and UDP both original from and are targeted towards certain ports on two systems. From the source system, packets are multiplexed and on the target system packets are demultiplexed. In contrast to UDP which is a connectionless protocol, TCP has a good basis for reliable data transfer through its use of sequence and acknowledge numbers which allow two systems to determine if packets had been successfully received or not. Beyond this, TCP has a section for specific flags such as the FIN flag which can help systems communicate to each other that a transmission is ending.

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