Explain TCP and UDP architectures.

Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) are two of the most common transport layer protocols used in computer networks to facilitate communication between devices. They serve as the foundation for data exchange over IP networks, such as the internet. While both protocols have their own characteristics and use cases, they differ in terms of their reliability, connection-oriented vs. connectionless nature, and how they handle data delivery. Let's explore the architectures of TCP and UDP in detail.

**TCP (Transmission Control Protocol):**

TCP is a connection-oriented, reliable, and stream-oriented transport layer protocol. It ensures that data is delivered accurately and in the correct order between devices. TCP establishes a logical connection between the sender and receiver before data exchange occurs. This connection is established using a three-way handshake:

1. **SYN (Synchronize):** The sender initiates the connection by sending a SYN packet to the receiver.

2. **SYN-ACK (Synchronize-Acknowledge):** The receiver responds with a SYN-ACK packet, acknowledging the request and indicating its readiness to establish a connection.

3. **ACK (Acknowledge):** The sender sends an ACK packet to confirm the establishment of the connection.

Once the connection is established, data transfer can begin. TCP provides several mechanisms to ensure reliable data delivery:

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