200-301: Cisco Certified Network AssociateDemo

Domain Name System resolution is provided by authoritative DNS servers and resolver DNS servers. An authoritative server contains the DNS records for a domain or zone and returns the official record data for names it hosts. A resolver server handles client queries and obtains the answer by performing recursive or iterative lookups, often caching the result. Web servers, file transfer servers, and ESX hosts do not provide the DNS server roles used for domain-name-to-IP-address resolution.