On modern operating systems, ports are numbered addresses for network traffic. Different kinds of services use different ports by default.
On modern operating systems, ports are numbered addresses for network traffic. Different kinds of services use different ports by default.
image:./nmapscan.png[width=400,float="right"]
For example, normal web traffic uses Port 80, while POP3 email uses Port 110. One of the ways that a firewall works is by allowing or restricting traffic over a particular port.
For example, normal web traffic uses Port 80, while POP3 email uses Port 110. One of the ways that a firewall works is by allowing or restricting traffic over a particular port.
image:./nmapscan.png[width=400,float="right"]
Because the ports can cause a security risk, it’s critical to know which ports are open and which are blocked.
Because the ports can cause a security risk, it’s critical to know which ports are open and which are blocked.
zeus
3 years ago