An international IT corporation is setting up an R&D center in China, and the chair faculty is hiring network researchers. They decided they wanted to try a fun interview puzzle classic:421Please respect copyright.ＰＥＮＡＮＡcCa9LAwFtz
"Describe what will happen after you type in google.com and enter in your browser with as much detail as possible."421Please respect copyright.ＰＥＮＡＮＡOQhFCBaciF
Half an hour has passed, and the applicant is still lecturing enthusiastically about the protocol specifications of Shadowsocks, Trojan, and VMess, the encryption, emulation, and obfuscation standards for the network traffic, the automated packet analysis set up by the ISP and the communist party, and it seemed the step where the browser receives a DNS name record is still an hour away.421Please respect copyright.ＰＥＮＡＮＡpWD6VfSIQk
...421Please respect copyright.ＰＥＮＡＮＡIQ2N6xWhRu
Several hours of intensive lecturing later, the applicant says:421Please respect copyright.ＰＥＮＡＮＡ3MtZIospQm
"And finally, you receive an RST flag, and then the agents with the Bureau for the Protection of National Political Security knock on your door."421Please respect copyright.ＰＥＮＡＮＡb8VQnxXmxw
And the applicant sat down and paused.421Please respect copyright.ＰＥＮＡＮＡOIOEe1VhFe
Knock, knock.421Please respect copyright.ＰＥＮＡＮＡND0qDA89uc
The chair faculty was confused as they've already sent everybody in the office home just to listen to this applicant's wonderful lecture until the end.421Please respect copyright.ＰＥＮＡＮＡjKHwfvFmEC
and then Add to home screen.