Learn about TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) in this comprehensive video lecture from the CCNA 200-301 course. Explore Layer 4 basics, port numbers, session multiplexing, TCP overview, header structure, connection establishment and termination processes, sequencing, acknowledgment, and flow control. Compare TCP and UDP, memorize important port numbers, and test your knowledge with quizzes. Gain essential networking knowledge for the CCNA certification exam through clear explanations and practical examples.