(This series of courses uses Microsoft Onenote+Mindmanager/Xmind tools to explain, combined with GNS3, SecureCRT, Wireshark for project actual combat, abandoning the traditional "turning book" PPT method. Theoretical teaching covers everything from theory to practice. All class notes, concept explanations, topology analysis, experimental verification, project practice, etc. will be explained slowly for you! In addition, this course uses packet capture software to interpret the grouping of each protocol in detail, allowing you to appreciate the beauty of the underlying data! This course is suitable for all rookies/novices who study computer network and security, junior and senior network and security engineers, and friends who are struggling on the road of CCNA/CCNP/CCIE!)