<p><span>Congratulations, the screenshot showed that you've just passed the Internet Operator Competency Assessment Test of China, Level 1 (Learner, China in 2005). To obtain higher levels of certification, study the following subjects:<br><br>Level 2 (Beginner, China in 2007): Upgrading all deployed network protocols to encrypted versions, not only TCP but DNS and TLS SNI. If no encrypted version is available, use heuristic filters to ignore spoofed results.<br>Level 3 (Technician, China in 2010): Implement an original tunneling protocol resistant to keyword Sniffing, TCP reset attacks, and active probing.<br>Level 4 (Professional, China in 2013): Design an anti-traffic policer to maintain high throughput under intentional QoS and packet loss. Assess its effectiveness for China Telecom, China Unicom to Hong Kong, Korea, Japan, Singapore, USA, and Russia.<br>Level 5 (Engineer, China in 2015): Run multi-city network congestion monitoring servers via ping and traceroute. Learn the topology of domestic and international network backbone using self-study materials of mixed quality, identify key ISPs with good peering and transit relationships using BGP Looking Glass. <br>Level 6 (Expert, 2000-2024, always ongoing): Develop an original exploit to disrupt or de-synchronize stateful firewalls, such as manipulating packet fragmentation bit, spoofing SYN, ACK, FIN, allowing the Great Firewall of China to ignore your traffic completely.<br><br>By completing these certifications, you would be able to surf the Internet and looking at GitHub source code and American cat pictures with confidence.</span></p>