This is part of the #LinuxUpSkillChallenge. Don't forget to also check out the Official Instructions and the Reddit posts.
TCP/IP ports
Port Status
netstat: "network status" plays network connections and statistics.ss: "socket status" is a standard utility replacing the older netstat.nmap: "network map" is a port scanner, won't normally be installed by default.Host Firewall
ufw: "uncomplicated firewall" is a frontend for iptables.iptables: manages firewall rules.nftables: a package filtering framework built to replace the old iptables.For more detail on how I did each day, check out my log on Reddit. Follow me on Twitter for daily updates.