Exam LX0-104 topic 5 question 3 discussion

The file that is consulted when programs like netstat try to match port numbers to names is /etc/services. The /etc/services file is a database of well-known port numbers and their associated service names. The port numbers are used by Internet servers to identify the type of service being requested by a client. For example, when a client connects to a web server, it typically connects to port 80. The /etc/services file maps the port number 80 to the service name http. When programs like netstat display network connections, they use the information in /etc/services to display the service name instead of just the port number.