We pick b.root-servers.net, one of the 13 root servers (1), and ask it about dns.lv and learn that lv is delegated to six name servers (2), so we ask a.nic.lv where we learn that dns.lv is delegated to two name servers, including ns2.dns.lv (3), so we ask that one and get the following answer:
Dns.lv is a domain controlled by two domain name servers at dns.lv themselves having a total of four IP numbers. Two of them are on the same IP network.
There are several thousand of domains that use the name server ns2.dns.lv.
All of those use the two name servers ns1 and ns2.dns.lv together, hereafter referred to as "name server group 1", (example: zeize.lv, vision.lv and manna.lv ).