What is TCP Header in Networking? | CCNA TCP/IP Concept

This video explains the TCP Header—the control information added to each TCP segment to provide reliable, ordered, and error-checked delivery. You’ll learn every key field (ports, sequence/ack numbers, flags, window size, checksum) and how they work together for flow control, congestion control, and session management—essential for CCNA and real troubleshooting.

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What you'll learn:
TCP header purpose
Source & destination ports
Sequence and acknowledgment numbers
TCP flags (SYN, ACK, FIN, RST, PSH, URG)
Window size & flow control
Checksum and reliability
CCNA exam relevance

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