Which component of the DNS name space represents the highest level of hierarchy?
2025
Which component of the DNS name space represents the highest level of hierarchy?
- A.
Second-level domain (e.g., "example" in "example.com")
- B.
Subdomain (e.g., "mail" in "mail.example.com")
- C.
Root domain (".")
- D.
Top-level domain (TLD, e.g., ".com")
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Correct answer: C
The DNS (Domain Name System) hierarchy is organized as a tree structure.
Hierarchy order:
Root domain (.)
Top-level domain (TLD) such as .com, .org
Second-level domain such as example
Subdomains such as mail.example.com
Example:
mail.example.com.
. → Root domain
com → Top-level domain
example → Second-level domain
mail → Subdomain
Thus, the root domain is the highest level in the DNS hierarchy.