Which DNS software is abbreviated as BIND?

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

Answer: (A)

BIND stands for Berkeley Internet Name Domain. This is the historic and widely used DNS software that originated at Berkeley and became the reference implementation for DNS on Unix-like systems. It can operate as an authoritative server, a recursive resolver, or both, depending on configuration, which is why you’ll see it described as the classic DNS server in many deployments. The other programs—NSD, Unbound, and Knot DNS—are real DNS servers as well, but they have their own names and focuses: NSD is an authoritative-only server, Unbound is a validating recursive resolver, and Knot DNS is a high-performance DNS server. None of them abbreviate to BIND, which is why the correct match is the Berkeley Internet Name Domain implementation.