What is a subdomain, in network terms?

What is a subdomain, in network terms?

• A. A subdomain is a domain that is under a larger domain in the DNS hierarchy.
• B. A subdomain is a separate top-level domain like .org or .com.
• C. A subdomain is the same as the root domain.
• D. A subdomain is a mandatory part of all domain names.

Answer: (A)

A subdomain is a domain that sits under a larger domain in the DNS hierarchy. It’s created by adding a label to the left of an existing domain, like blog.example.com. The subdomain uses the same top-level domain (like .com) and the same parent domain (example.com), but it designates a specific section or service of that site. This helps organize different parts of a site or different services on separate addresses. Other choices mix up where subdomains fit in. A separate top-level domain like .org or .com is a different TLD, not a subdomain of another domain. The subdomain is not the same as the root domain—the root is the topmost level, and subdomains exist under it. And subdomains aren’t required for every domain name; you can have a domain without any subdomains, such as example.com by itself.

A subdomain is a domain that sits under a larger domain in the DNS hierarchy. It’s created by adding a label to the left of an existing domain, like blog.example.com. The subdomain uses the same top-level domain (like .com) and the same parent domain (example.com), but it designates a specific section or service of that site. This helps organize different parts of a site or different services on separate addresses.

Other choices mix up where subdomains fit in. A separate top-level domain like .org or .com is a different TLD, not a subdomain of another domain. The subdomain is not the same as the root domain—the root is the topmost level, and subdomains exist under it. And subdomains aren’t required for every domain name; you can have a domain without any subdomains, such as example.com by itself.