LC

Implement TCP Data Transfer with Sequence Numbers and ACKs

hard3/8

Implement the TCP 3-Way Handshake Using Raw Sockets Add Retransmission for Unacknowledged Segments

Language

Compiler

2.0s Limit 256MB

Implementation

Implement a simulation of TCP data transfer with sequence numbers and ACKs.

Requirements:

Simulate sender and receiver exchanging data segments
Show sequence numbers incrementing by bytes sent
Show ACK numbers acknowledging received data
Handle multiple segments with correct SEQ/ACK progression
Demonstrate in-order delivery concept
Show duplicate ACK concept for missing segments
Print each segment and ACK with sequence numbers
Calculate next expected sequence number after each exchange

Why This Matters

This SEQ/ACK bookkeeping is what the Linux kernel's tcp_sock struct maintains per connection, and it's exactly what Wireshark's 'Follow TCP Stream' feature reconstructs when reassembling a byte stream from captured segments. Real production bugs — like the interaction between Nagle's algorithm and delayed ACKs causing 40ms stalls — trace directly back to misunderstanding this sequence-number accounting.

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Sample validation

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main.c

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