收到信了。Dear Yuchen Wang, Congratulations on successfully completing the Cisco Certified Network Associate certification requirements. Candidates are automatically assigned a unique Cisco ID number after taking a Cisco Career Certification exam. Your Cisco ID number is CS0000000000. This Cisco ID number will be listed on your certificate and should be referenced when registering for additional Cisco exams to prevent delay on receiving proper credit for your exam(s). To ensure you receive your Cisco Certified Network Associate certificate with the correct spelling of your name, please confirm your name and address.