This article explains that a port is a numbered door on a device, with the IP address and port together identifying a specific service such as localhost:8000. It also shows how port scanning reveals open, closed, and filtered ports, and why understanding these basics is essential for security work and interviews. #Nmap #SSH #RDP #SMTP #DNS
Keypoints
- A port is a door that leads to a specific network service.
- The full service address combines an IP address and a port number.
- Common ports include 80, 443, 22, 3389, 25, and 53.
- Port scans identify whether ports are open, closed, or filtered.
- An open port is not automatically a vulnerability; context matters.
Read More: https://www.decodedsecurity.com/p/ports-and-why-we-scan-them