Chain structure is a common way to organize elements in computer programs, which has the advantages of simplicity and easy operation. It is characterized by connecting a series of data elements with pointers to form a linked list structure, which is suitable for the operation and storage of a large number of data. Chain structure is usually used to store and process linear data, which can quickly insert, delete and find data. It is an important data organization form in modern programming.

Inverse method, also known as inverse calculation or inversion method, refers to the process of deriving unknown results from known conditions. In the fields of science, technology and engineering, reverse thinking is often used as a common method to solve problems. Reverse thinking needs to analyze the problem carefully, determine the known conditions, and then deduce the unknown results according to the known conditions and related knowledge. It is a logical and systematic way of thinking.

In computer networks, chain structure and reverse thinking are widely used. Through the chain structure, we can store data information in the form of linked list, and we can access and process these data quickly, which is of great significance in the network system. Cross thinking can be used in the field of network security. By learning the reverse analysis method of attack events, we can effectively predict and prevent network attacks and ensure network security. Chain structure and reverse thinking are both indispensable parts of modern computer technology and have important application value.