Which DNS server software is widely used and often abbreviated as BIND?

• A. Unbound
• B. BIND (Berkeley Internet Name Domain)
• C. Knot DNS
• D. PowerDNS

Answer: (B)

BIND is the widely used DNS server software whose abbreviation comes from Berkeley Internet Name Domain. This implementation has been the de facto standard for DNS since the early days of the internet, built to handle both authoritative and recursive name services and to adhere closely to the DNS protocol. Its long history, broad interoperability, and mature feature set have made it the default choice in many Unix-like environments and enterprise networks, so the acronym BIND is very commonly recognized. Other DNS servers exist—Unbound focuses on secure recursive resolution, Knot DNS emphasizes fast authoritative performance, and PowerDNS offers flexible back-end options—but they are not the software most people refer to by the acronym BIND.