CompTIA Network+ Practice Test

The correct answer is based on the architecture of the Domain Name System (DNS) and its root servers. There are 13 root DNS server clusters, which are strategically distributed around the globe to ensure reliability, redundancy, and performance in the resolution of domain names. These server clusters are identified by letters from A to M, and while there are 13 primary root server IP addresses, each of these is often replicated across numerous locations using anycast routing. This means that there are actually hundreds of physical servers operating around the world, but they all function as part of the 13 root server entities.

The significance of having these 13 root server clusters lies in their crucial role in the DNS hierarchy, serving as the initial point of reference when a DNS resolver seeks to translate a domain name into an IP address. The robust network of these servers enhances the resilience and accessibility of DNS, ensuring that users can reliably reach websites and services across the internet.