Introduction to the transport and application layers. Learn how computer programs talk to each other through a network, with the transport layer addressing traffic, making long-running connections, and ensuring data integrity; while the application layer allows the applications themselves to send and receive data. Go over firewalls, TCP control flags, and connection-oriented vs. connectionless protocols.

0:00 Introduction to the Transport and Application Layers
1:38 The Transport Layer
5:02 Dissection of a TCP Segment
10:17 TCP Control Flags and the Three-way Handshake
15:52 TCP Socket States
18:48 Connection-oriented and Connectionless Protocols
23:02 Firewalls
25:08 The Application Layer
28:04 The Application Layer and the OSI Model
30:06 All the Layers Working in Unison

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