Why do I need a documented list of all services and ports?

Think of this list as an inventory of all the "doors and windows" (ports) in your computer network, and what each one is used for (services). It will help you understand:

• Which connections your business actually needs
• Which programs are running on your network
• Which communication channels are open.

Understanding services and ports:

• Services are programs running on your network (like email, web hosting, or file sharing)
• Ports are like numbered doors that let these services communicate with the internet
• Each service uses specific port numbers (like web traffic using port 80).

Why keep this list?

• Identify unnecessary open ports (like unlocked doors you don't use)
• Find outdated services that hackers could exploit
• Close or remove anything you don't need
• Keep your network secure by knowing exactly what's running.

Where to get it:

Your Internet Service Provider (ISP) can usually provide this information, or your IT team can create it by reviewing your firewall and router settings.

Think of it like checking all the doors and windows in your house — you want to know which ones you use and make sure the rest are locked.