CCIE (Cisco Certified Internetwork Expert) is an advanced certification from Cisco that covers all aspects of network engineering. If you have already obtained CCIE certification, but want to do CCIE recertification (recertification), the following is a general description of the process: Check the certification expiration date: First, you need to determine when your CCIE certification expires. Before your certification expires, you will need to recertify to keep your certification valid. Collect Continuing Education Credits: CCIE recertification requires the holder to obtain sufficient credits through Continuing Education (CE). You can earn credits by attending Cisco's officially recognized training courses, seminars, technical conferences, e-learning, and so on. Specific requirements and types of acceptable credits can be found on the official Cisco website. Confirmation of credit requirements: Different CCIE professional certifications may have different credit requirements. Before proceeding with recertification, make sure that you have met the required number and type of credits. You can find the relevant certification requirements and credit regulations on the official Cisco website. Submit an application: Once you have collected enough credits, you can log in to the Cisco certification platform and fill out the CCIE recertification application. In the application, you need to provide relevant supporting materials, such as certificates of training courses attended, seminar attendance records and so on. Audit and Certification: Your recertification application will be audited by the Cisco certification team. They will verify the supporting materials you have submitted and confirm that you have met the requirements for recertification. If everything meets the requirements, your CCIE certification will be renewed and you will receive a new certification cycle.