How TCP Knows a Packet Is Lost | Duplicate ACK & Fast Retransmit Explained
Ever wondered how TCP knows a packet was lost even though the network never explicitly reports it?
In this video, you'll learn how TCP detects packet loss using Duplicate ACKs and how Fast Retransmit helps recover lost data without waiting for a timeout. Using simple examples and relative sequence numbers, we break down the entire process step by step so you can clearly understand what happens when a TCP segment goes missing.
Topics covered in this video:
• What happens when a TCP segment is lost
• How the receiver detects missing data
• Understanding cumulative acknowledgments
• What a Duplicate ACK is and why it is generated
• How the sender identifies packet loss
• TCP Fast Retransmit explained
• Why TCP retransmits before a timeout occurs
• Complete packet loss example using relative sequence numbers
This video is perfect for students, network engineers, CCNA learners, interview preparation, and anyone trying to understand how TCP ensures reliable data delivery across the network.
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#TCP #Networking #PacketLoss #TCPRetransmission #DuplicateACK #FastRetransmit #NetworkEngineering #CCNA #ComputerNetworks #TCPSegment #TCPIP #NetworkProtocols