Which file is commonly referenced for DNS information?

When discussing DNS information within Linux and Unix-like operating systems, the file commonly referenced is "resolv.conf". This file is essential because it contains configuration information that allows the system resolver to find DNS servers and thereby resolve domain names into IP addresses.

The "resolv.conf" file typically includes directives that specify the nameserver's IP addresses, search domains, and options for DNS resolution. When a user or application queries a domain name, the system first consults this file to determine which DNS servers to query. The presence of this file is critical for proper DNS functionality on a system, making it the standard configuration file for DNS settings.

The other options serve different purposes: for instance, "/etc/network/interfaces" is primarily associated with network interface configurations, "host" may refer to the command or program used to query DNS, and "dns.conf" is not a standard file in typical DNS setups. Thus, "resolv.conf" stands out as the correct reference for managing DNS information in a system environment.