Transport Layer Topics: TCP, Multiplexing & Sockets

What is the Transport Layer?

Why do we need reliability?

How do we transfer data reliably over an unreliable channel?

So what is TCP?

How do we initiate a Transport Layer Connection and manage data flow?

Flow Control

TCP sliding window mechanism —

Network Congestion

At each ‘hop’ in the network, the packet needs to be processed. The router can only process so much data at once, so it has a buffer for the waiting data. If the buffer over-flows, the data packets are dropped. TCP retransmits the lost data. Since retransmission is inefficient, it shrinks the window to avoid dropping more data in future congestion.

TCP Segment Deep Dive

Nesting of segments, packets, and frames — Launch School
Note: This article pertains to IPv4. IPv6 headers don’t include a checksum for TCP because it is implemented at the Transport or Data Link/Link layers.

Why do we care about the source and destination port addresses in the TCP Segment?


Multiplexing & De-Multiplexing

Why is multiplexing necessary?

Thanks for reading my overview of the Transmission Control Protocol. Leave a comment or post if you have any questions!

Journalist and endlessly curious person. One half of @hatchbeat.

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