Book Image

Boost.Asio C++ Network Programming

By : Wisnu Anggoro
Book Image

Boost.Asio C++ Network Programming

By: Wisnu Anggoro

Overview of this book

Table of Contents (15 chapters)
Boost.Asio C++ Network Programming Second Edition
About the Authors
About the Reviewers

Understanding TCP and UDP

As we discussed earlier in this chapter in the Transport layer section, TCP and UDP are the main protocols that are used to transfer data across a network. The delivery mechanisms that they have are different from each other. TCP has acknowledgments, sequence numbers, and flow control in transferring data process to provide a guaranteed delivery, whereas UDP does not provide a guaranteed delivery but provides a delivery with best efforts.

Transmission Control Protocol

TCP performs a three-way handshaking process before the protocol establishes the session. This is done in order to provide a guaranteed delivery. Refer to the following figure to understand the three-way handshaking process:

From the preceding image, imagine that Carol's device wants to transfer data to Bryan's device and that they need to perform a three-way handshaking process. First, Carol's device sends a packet to Bryan's device with the synchronize (SYN) flag enabled. Once Bryan's device receives...