Cisco certification is a kind of international network technology certification system launched by Cisco, assessing and certifying the knowledge and practical ability of network engineers by means of exams. The certification includes a number of levels and professional direction, covering from basic network knowledge to advanced network architecture and other areas, designed to help network engineers to enhance their skills and career development. Cisco certification levels mainly include: Entry level: CCENT (Cisco Certified Entry Networking Technician), the certification verifies the basic network knowledge and skills of network engineers. Basic level: CCNA (Cisco Certified Network Associate), the certification validates the network engineer's intermediate network knowledge and skills. Advanced level: CCNP (Cisco Certified Network Professional), the certification validates the network engineer's advanced network knowledge and skills. Expert level: CCIE (Cisco Certified Internetwork Expert), which is a highly specialized certification that validates a network engineer's in-depth technical and problem-solving skills. In addition to the level, the Cisco certification includes several specializations, such as security, routing and switching, and wireless networking. These specializations allow network engineers to learn and master a specific area of networking knowledge and skills in greater depth. In conclusion, Cisco certification is an important international network technology certification system, which comprehensively evaluates and certifies the knowledge and practical ability of network engineers by means of exams, aiming at helping network engineers to improve their skills and career development.