Which files contain host, network, protocol, and service information in Linux?

The files are:

/etc/hosts
/etc/networks
/etc/protocols
/etc/services

The above files store host, network, protocol, and service information in Linux.

Example:

• /etc/hosts – Provides information about the hostnames and their IP addresses.
• /etc/networks – Provides information about network names and their network addresses.
• /etc/protocols – Provides information about network protocols.
• /etc/services – Provides information about service names and their port numbers.