1. root zone ?

root サーバのドメイン名にはどのような意味があるのだろうか。

root と root-servers.net のNSは [a..m].root-servers . net だ。これは親子ではなくて、祖父母と孫の関係かな。

%dnsq ns . a.root-servers.net 

2 .:
496 bytes, 1+13+0+13 records, response, authoritative, noerror
query: 2 .
answer: . 518400 NS c.root-servers.net
answer: . 518400 NS m.root-servers.net
answer: . 518400 NS k.root-servers.net
answer: . 518400 NS l.root-servers.net
answer: . 518400 NS i.root-servers.net
answer: . 518400 NS e.root-servers.net
answer: . 518400 NS d.root-servers.net
answer: . 518400 NS j.root-servers.net
answer: . 518400 NS b.root-servers.net
answer: . 518400 NS a.root-servers.net
answer: . 518400 NS f.root-servers.net
answer: . 518400 NS h.root-servers.net
answer: . 518400 NS g.root-servers.net
additional: c.root-servers.net 3600000 A 192.33.4.12
additional: m.root-servers.net 3600000 A 202.12.27.33
additional: m.root-servers.net 3600000 28 \040\001\015\303\000\000\000\000\000\000\000\000\000\000\0005
additional: k.root-servers.net 3600000 A 193.0.14.129
additional: k.root-servers.net 3600000 28 \040\001\007\375\000\000\000\000\000\000\000\000\000\000\000\001
additional: l.root-servers.net 3600000 A 199.7.83.42
additional: l.root-servers.net 3600000 28 \040\001\005\000\000\003\000\000\000\000\000\000\000\000\000B
additional: i.root-servers.net 3600000 A 192.36.148.17
additional: i.root-servers.net 3600000 28 \040\001\007\376\000\000\000\000\000\000\000\000\000\000\000S
additional: e.root-servers.net 3600000 A 192.203.230.10
additional: d.root-servers.net 3600000 A 199.7.91.13
additional: d.root-servers.net 3600000 28 \040\001\005\000\000-\000\000\000\000\000\000\000\000\000\015
additional: j.root-servers.net 3600000 A 192.58.128.30

10:46f%dnsq ns root-servers.net a.root-servers.net 

2 root-servers.net:
506 bytes, 1+13+0+15 records, response, authoritative, noerror
query: 2 root-servers.net
answer: root-servers.net 3600000 NS a.root-servers.net
answer: root-servers.net 3600000 NS b.root-servers.net
answer: root-servers.net 3600000 NS c.root-servers.net
answer: root-servers.net 3600000 NS d.root-servers.net
answer: root-servers.net 3600000 NS e.root-servers.net
answer: root-servers.net 3600000 NS f.root-servers.net
answer: root-servers.net 3600000 NS g.root-servers.net
answer: root-servers.net 3600000 NS h.root-servers.net
answer: root-servers.net 3600000 NS i.root-servers.net
answer: root-servers.net 3600000 NS j.root-servers.net
answer: root-servers.net 3600000 NS k.root-servers.net
answer: root-servers.net 3600000 NS l.root-servers.net
answer: root-servers.net 3600000 NS m.root-servers.net
additional: a.root-servers.net 3600000 A 198.41.0.4
additional: b.root-servers.net 3600000 A 192.228.79.201
additional: c.root-servers.net 3600000 A 192.33.4.12
additional: d.root-servers.net 3600000 A 199.7.91.13
additional: e.root-servers.net 3600000 A 192.203.230.10
additional: f.root-servers.net 3600000 A 192.5.5.241
additional: g.root-servers.net 3600000 A 192.112.36.4
additional: h.root-servers.net 3600000 A 128.63.2.53
additional: i.root-servers.net 3600000 A 192.36.148.17
additional: j.root-servers.net 3600000 A 192.58.128.30
additional: k.root-servers.net 3600000 A 193.0.14.129
additional: l.root-servers.net 3600000 A 199.7.83.42
additional: m.root-servers.net 3600000 A 202.12.27.33
additional: a.root-servers.net 3600000 28 \040\001\005\003\272>\000\000\000\000\000\000\000\002\0000
additional: d.root-servers.net 3600000 28 \040\001\005\000\000-\000\000\000\000\000\000\000\000\000\015