Ubuntu 21.04
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BIND : Verify Resolution
2021/05/05
[1] Restart BIND to apply changes.
root@dlp:~#
systemctl restart named

[2] Change DNS setting to refer to own DNS if need.
root@dlp:~#
vi /etc/netplan/01-netcfg.yaml
# change to self IP address

    nameservers:
        addresses: [10.0.0.30]

root@dlp:~#
netplan apply

[3] Verify Name and Address Resolution. If [ANSWER SECTION] is shown, that's OK.
root@dlp:~#
dig dlp.srv.world.


; <<>> DiG 9.16.8-Ubuntu <<>> dlp.srv.world.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34889
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;dlp.srv.world.                 IN      A

;; ANSWER SECTION:
dlp.srv.world.          7195    IN      A       10.0.0.30

;; Query time: 0 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Wed May 05 08:09:19 UTC 2021
;; MSG SIZE  rcvd: 58

root@dlp:~#
dig -x 10.0.0.30


; <<>> DiG 9.16.8-Ubuntu <<>> -x 10.0.0.30
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56330
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;30.0.0.10.in-addr.arpa.                IN      PTR

;; ANSWER SECTION:
30.0.0.10.in-addr.arpa. 86400   IN      PTR     dlp.srv.world.

;; Query time: 0 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Wed May 05 08:09:56 UTC 2021
;; MSG SIZE  rcvd: 78
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