(16. Countermeasures after forgetting the ROS code. Several common methods to crack the ROS code. Voice video 15 minutes 30 seconds 17 speed limit (simplequeue) brief row and column high-end speed limit and PPPoE speed limit voice video 30 minutes 32 seconds 18ros security settings are set for ROS user security, password security, service, firewall, etc, Make your ROS safe voice video 17 minutes 19 seconds 19hotspot hot authentication points explain the advantages of hotspot and the establishment process and methods of hotspot service voice video 15 minutes 48 seconds 20ros firewall strategy deepen comments on the input, output, forward chain and Src address, DST address, as well as the connection between in-interface and out interface voice video 20 minutes 36 seconds 21 script generator briefly introduces the application of some tools of ROS, The intention is to eliminate the fear of ROS for beginners, so that rookies can get started faster. Get started with voice video for 20 minutes and 21 seconds)