Assuming it is a DNSSEC aware recursive server it asks the COM servers if it
hasn’t cached it as part of the referral process.
[beetle:~/git/bind9] marka% dig ds example.com @a.gtld-servers.net
; <<>> DiG 9.13.1+hotspot+add-prefetch+marka <<>> ds example.com
@a.gtld-servers.net
;; global options
Greetings.!
how does recursive resolver get the information for a zone example.com in
below setup when
example.com has DS records in .com
.com is tld zone
example.com is sld zone
Regards,
Ramesh
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