Checking if a port is open, also known as port scanning, is a crucial step in network troubleshooting and security assessment. It involves sending a probe to a specific port on a remote host to determine if it is reachable and accepting connections. Open ports indicate that a service or application is listening on that port, allowing communication and data exchange.
Port scanning plays a vital role in network security by identifying potential vulnerabilities and unauthorized access points. By proactively checking for open ports, network administrators can strengthen their defenses against cyber threats, such as malware and hacking attempts. Additionally, port scanning helps troubleshoot network connectivity issues, ensuring smooth communication between devices and applications.