What is a DNS resolver and what does it do?

What is a DNS resolver and what does it do?

• A. A DNS resolver blocks malicious domains at the firewall.
• B. A DNS resolver queries DNS servers to translate a domain name into an IP address for your device.
• C. A DNS resolver changes domain names into host names within the same network.
• D. A DNS resolver caches web content to speed up browsing.

Answer: (B)

A DNS resolver translates human-friendly domain names into numerical IP addresses so devices can connect to the right server. When you type a domain, your device asks the DNS resolver to find its IP. The resolver then queries a sequence of DNS servers—from the root to the top-level domain to the domain’s authoritative server—until it learns the exact address. It sends that IP back to your device, enabling the connection. The resolver also caches recent lookups to speed up future requests. This function doesn’t block sites at a firewall, it doesn’t convert domain names into hostnames within a network, and it doesn’t cache web page content. So the essence is that it queries DNS servers to translate a domain name into an IP address for your device.

A DNS resolver translates human-friendly domain names into numerical IP addresses so devices can connect to the right server. When you type a domain, your device asks the DNS resolver to find its IP. The resolver then queries a sequence of DNS servers—from the root to the top-level domain to the domain’s authoritative server—until it learns the exact address. It sends that IP back to your device, enabling the connection. The resolver also caches recent lookups to speed up future requests. This function doesn’t block sites at a firewall, it doesn’t convert domain names into hostnames within a network, and it doesn’t cache web page content. So the essence is that it queries DNS servers to translate a domain name into an IP address for your device.