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Implementation & Simulation

Socket Code & Live Demo

Explore annotated Python UDP socket code and watch packets travel in real time through our interactive simulation.

python
1import socket
2
3SERVER_HOST = '127.0.0.1'
4SERVER_PORT = 9000
5
6# Create UDP socket
7sock = socket.socket(
8 socket.AF_INET,
9 socket.SOCK_DGRAM
10)
11
12# NOTE: No connect() call!
13# No SYN, no SYN-ACK, no ACK.
14
15message = 'Hello, UDP Server!'
16
17# Send datagram directly
18sock.sendto(
19 message.encode('utf-8'),
20 (SERVER_HOST, SERVER_PORT)
21)
22
23# Optionally receive a reply
24data, addr = sock.recvfrom(1024)
25print(f'Server replied: {data.decode()}')
26
27sock.close()

Line Explanation

Hover over a line to see its explanation.

Highlighted Lines

12There is NO handshake — we send immediately
21
24Wait for server echo response

Network Topology

Interactive Node Diagram

Drag nodes to explore the architecture. UDP operates strictly on a "fire and forget" mechanism, passing datagrams directly through the IP layer.

React Flow

Live Simulation

Connection-less Packet Demo

Client127.0.0.1:EPHEMERAL
No SYN • No ACK • Fire & Forget
Server127.0.0.1:9000
System Log
04:38:05UDP socket initialized. No connection required.