HCIE certification exam mainly consists of two modules: theory exam, laboratory exam. The theoretical examination is divided into three stages: basic, professional and comprehensive. The basic stage mainly examines the network foundation, network protocols and routing technology and other aspects of knowledge; professional stage mainly examines the network design, network security and network optimization and other aspects of knowledge; comprehensive stage mainly examines the application scenarios, solutions and other aspects of knowledge. The experimental examination mainly examines the skills of network design, implementation and tuning, etc. The examination process needs to complete the actual operation by oneself, and needs to complete all the tasks within the stipulated time.