DNS Security is based on Domain Name System Security Extensions (DNSSEC), which is a specification to add security to the Domain Name System(DNS). By the use the digital signatures, it provides the DNS data integrity and origin authentication to the DNS clients. If DNSSEC is enabledon Vigor Router, before asking for the address of a domain name, the router will perform iterativequeriesfor DNSKEY and RRsig to validate the information provided by each DNS server, thus to ensure the DNS response will not be a bogus one.