In the DNS hierarchy, what is the term for the part like 'karel' in 'karel.codehs.me'?

In the DNS hierarchy, what is the term for the part like 'karel' in 'karel.codehs.me'?

• A. Root
• B. Top-Level Domain
• C. Second Level Domain
• D. Subdomain

Answer: (C)

In DNS, the domain name is a stack of labels read from right to left: the rightmost label is the top-level domain, the label to its left is the second-level domain, and any labels further to the left are subdomains of that domain. In karel.codehs.me, the top-level domain is me, the second-level domain under that is codehs, and karel sits to the left of codehs.me as an additional label. That makes karel a subdomain of the codehs.me domain. The second-level domain would be codehs, not karel.

In DNS, the domain name is a stack of labels read from right to left: the rightmost label is the top-level domain, the label to its left is the second-level domain, and any labels further to the left are subdomains of that domain. In karel.codehs.me, the top-level domain is me, the second-level domain under that is codehs, and karel sits to the left of codehs.me as an additional label. That makes karel a subdomain of the codehs.me domain. The second-level domain would be codehs, not karel.