After reading some chapters and book directories in the book "TCP/IP protocol family", I feel that this book is rich in content and involves all aspects of network protocols. They all said that this book is illustrated in images and texts, but because it was a trial on the Internet, the picture was not displayed due to network reasons. So I don't feel very deep about the biggest features of this book, but when I explain some principles of computer networks, the examples selected in some aspects are very practical, and the actual contact is very tight. In this way, it is not very difficult to understand. For example, when talking about services at the network layer, this book lists an example of Alice sending a message to Bob, the manager of the flower shop. This example is easy to understand and is also relevant to reality, in the course of learning, we can also learn and think through examples that are closely related to the actual situation. The general feeling is that this is a good book and it is worth a good look.