Networking
Interfaces, port scanning, HTTP and SSH from the shell.
Networking Networking basics Inspect your own network, fetch pages and connect over ssh from your phone.
Networking DNS and addresses See how a name becomes an address on your phone and check the answer yourself with dig.
Networking SSH and remote work Log in to another machine from your phone and move files over a secure link.
Networking Moving files between machines Learn to copy files to another host with scp and rsync, and preview every change first.