LC

Implement TCP Sliding Window Flow Control

hard5/8

Add Retransmission for Unacknowledged Segments Implement TCP Connection Teardown (FIN/ACK Sequence)

Language

Compiler

2.0s Limit 256MB

Implementation

Implement a simulation of TCP sliding window flow control.

Requirements:

Define sender window with sequence numbers
Show window size limiting bytes in flight
Send multiple segments until window is full
Process ACK and slide window forward
Track bytes in flight after each operation
Show window update when receiver consumes data
Demonstrate zero-window scenario and probing
Print window state, bytes in flight, and ACK progression

Why This Matters

This is the flow-control half of what makes TCP usable on long-fat networks; RFC 7323's window scaling option exists purely because the 16-bit window field you're modeling here caps throughput at ~5 Mbps on a 100ms-RTT link without it. The Linux kernel auto-tunes this window per socket (net.ipv4.tcp_rmem) instead of using a fixed size, directly building on the mechanism in this task.

Hints

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Validation Suite

main.c

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