.

While learning cybersecurity, one thing I’ve started realizing is this:

Network communication doesn’t just happen between systems… it happens through ports.

Ports are basically the points that allow different services to send and receive data.

Every service running on a system is connected to a specific port.

So understanding ports helps in knowing what is running and what is exposed.

Common ports and what they are used for

• Port 80 (HTTP) — Web traffic (not secure)

• Port 443 (HTTPS) — Secure web communication

• Port 22 (SSH) — Remote system access

• Port 21 (FTP) — File transfer

• Port 25 (SMTP) — Sending emails

• Port 53 (DNS) — Resolving domain names

• Port 3389 (RDP) — Remote desktop access

Why this matters?

Ports are necessary for communication,

but at the same time, they can also become entry points.

If ports are: • Left open unnecessarily

• Not properly secured

• Exposed to the internet

they can be targeted by attackers.

Key takeaway:

Ports are essential for how systems communicate,

but every open port is also something that needs attention.

Knowing which ports are open and why

is an important step in keeping systems secure.