What is the primary function of DNS?

What is the primary function of DNS?

• A. To translate human-readable domain names into numerical IP addresses
• B. To secure web traffic end-to-end
• C. To manage email delivery routes
• D. To allocate IP addresses dynamically

Answer: (A)

DNS translates human-readable domain names into numerical IP addresses, letting devices locate the exact network host behind a URL. When you try to reach a domain, your device queries a resolver, which navigates the DNS hierarchy—from root to top-level domain servers to the domain’s authoritative servers—to obtain the IP address, often storing the result in a cache for faster future lookups. This translation is essential because routing on the Internet uses IP addresses, not names. The other options describe tasks handled by different mechanisms: securing web traffic end-to-end is done with encryption like TLS/HTTPS, email routing involves MX records within DNS but DNS’s main role isn’t mail routing, and dynamically allocating IP addresses is the job of DHCP. Thus, the core purpose is converting domain names into IP addresses.

DNS translates human-readable domain names into numerical IP addresses, letting devices locate the exact network host behind a URL. When you try to reach a domain, your device queries a resolver, which navigates the DNS hierarchy—from root to top-level domain servers to the domain’s authoritative servers—to obtain the IP address, often storing the result in a cache for faster future lookups. This translation is essential because routing on the Internet uses IP addresses, not names. The other options describe tasks handled by different mechanisms: securing web traffic end-to-end is done with encryption like TLS/HTTPS, email routing involves MX records within DNS but DNS’s main role isn’t mail routing, and dynamically allocating IP addresses is the job of DHCP. Thus, the core purpose is converting domain names into IP addresses.