Which of the following files is consulted when programs like netstat try to match port numbers to names?

The /etc/networks file maps network names to network numbers, not port numbers to service names.

/etc/portmapper is not a standard configuration file for matching port numbers to names; portmapper (rpcbind) is a service that maps RPC program numbers to network port numbers.

The /etc/protocols file maps protocol names (like tcp, udp, icmp) to protocol numbers, not service names to port numbers.

The /etc/resolv.conf file specifies the configuration for DNS resolvers, such as nameserver addresses and search domains, not port-to-service name mappings.

The /etc/services file is a standard Unix-like system configuration file that contains a list of known service names and their corresponding port numbers and protocols (e.g., http 80/tcp), which netstat uses for displaying service names instead of numeric ports.