TCP - UDP - Draft

TCP - UDP #

UDP #

User Datagram Protocol

Overview #

udp

  • Message Based Layer 4 protocol
  • Ability to address processes in a host using ports
  • Simple protocol to send and receive messages
  • Prior communication not required (double edge sword)
  • Stateless no knowledge is stored on the host
  • 8 byte header Datagram

Demo # 

// server.js
import dgram from "dgram";

const socket = dgram.createSocket("udp4");
socket.bind(5500, "127.0.0.1");
socket.on("message", (msg, info) => {
  console.log(
    `My server got a datagram ${msg}, from ${info.address}:${info.port}`
  );
});

# client terminal
nc -u 127.0.0.1 5500

# client terminal
Hi

# client terminal
I am Dang

The result of the server log: (TBU)

TCP #

Transmission Control Protocol

Overview #

tcp_handshake

  • Stream based Layer 4 protocol
  • Ability to address processes in a host using ports
  • “Controls” the transmission unlike UDP which is a firehose
  • Connection
  • Requires handshake
  • 20 bytes headers Segment (can go to 60)
  • Stateful

3 ways handshake #

Demo # 

// server.js
import net from "net";

const server = net.createServer((socket) => {
  console.log(
    `TCP successfully handshack with ${socket.remoteAddress}:${socket.remotePort}`
  );
  socket.write("Hello Client!");
  socket.on("data", (data) => {
    console.log(`Received data ${data.toString()}`);
  });
  server.listen(6600, "127.0.0.1");
});

# client terminal
nc 127.0.0.1 6600

Client recieve message when successful establish the connection: (TBU)

# client terminal
This is data to send to the server!

Reference #