Knot is an authoritative-only nameserver developed by CZ.NIC Labs. On their website you can read that it supports all key
How to run NSD with DNSSEC on Ubuntu 11.10
Domain Name System Security Extensions (DNSSEC) is a set of extensions to DNS documented since 2005 by RFCs 4033, 4034,
How to configure Unbound on Ubuntu 11.10
Unbound is an implementation of a DNS resolver that does caching and DNSSEC validation. It’is written and maintained by NLnet
How to configure master and slave NSD on Ubuntu 11.10
NSD is a complete implementation of an authoritative DNS nameserver written and maintained by NLnet Labs. Authoritative and not recursive. If