TCP/IP 3-Way Handshake - Free HTML Lessons | Full Stack Web Development | Nextsem

1. What is Transmission Control Protocol?

1. TCP ensures reliable internet data delivery.

2. Data divides into numbered smaller packets.

3. Lost packets retransmit automatically until received.

4. Packets reassemble in perfect sequential order.

5. Web browsers rely on TCP streams.

Example

Try it Yourself »

<!DOCTYPE html>

<head>

<title>TCP Handshake Demo</title>

</head>

<body>

<h1>TCP Connection Established</h1>

<p>Data streams securely over port 443.</p>

</body>

</html>

2. The 3-Way Handshake Steps

1. Client sends SYN synchronize packet first.

2. Server replies with SYN-ACK acknowledgment packet.

3. Client confirms with final ACK packet.

4. Three steps establish secure socket connection.

5. Data transmission begins after handshake completes.

3. Why the Handshake Matters

1. Handshake prevents duplicate connection request confusion.

2. Both sides agree on sequence numbers.

3. Connection verifies server is truly listening.

4. Sockets allocate memory for incoming streams.

5. Unreachable servers fail before sending data.

4. Testing Port 443 with Test-NetConnection

1. PowerShell tests specific server TCP ports.

2. Test-NetConnection connects to port 443 safely.

3. Tool performs full TCP 3-way handshake.

4. TcpTestSucceeded confirms successful network socket setup.

5. Remote address verifies connected cloud server.

Example

Try it Yourself »

Test-NetConnection nextsem.online -Port 443

1. What is Transmission Control Protocol?

1. TCP ensures reliable internet data delivery.

2. Data divides into numbered smaller packets.

3. Lost packets retransmit automatically until received.

4. Packets reassemble in perfect sequential order.

5. Web browsers rely on TCP streams.

Example

Try it Yourself »

<!DOCTYPE html>

<head>

<title>TCP Handshake Demo</title>

</head>

<body>

<h1>TCP Connection Established</h1>

<p>Data streams securely over port 443.</p>

</body>

</html>

2. The 3-Way Handshake Steps

1. Client sends SYN synchronize packet first.

2. Server replies with SYN-ACK acknowledgment packet.

3. Client confirms with final ACK packet.

4. Three steps establish secure socket connection.

5. Data transmission begins after handshake completes.

3. Why the Handshake Matters

1. Handshake prevents duplicate connection request confusion.

2. Both sides agree on sequence numbers.

3. Connection verifies server is truly listening.

4. Sockets allocate memory for incoming streams.

5. Unreachable servers fail before sending data.

4. Testing Port 443 with Test-NetConnection

1. PowerShell tests specific server TCP ports.

2. Test-NetConnection connects to port 443 safely.

3. Tool performs full TCP 3-way handshake.

4. TcpTestSucceeded confirms successful network socket setup.

5. Remote address verifies connected cloud server.

Example

Try it Yourself »

Test-NetConnection nextsem.online -Port 443