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An SOA record gathered from a zone transfer is shown here:
@ IN SOA DNSRV1.anycomp.com. postmaster.anycomp.com. (
4 ; serial number
3600 ; refresh [1h]
600 ; retry [10m]
86400 ; expire [1d]
3600 ) ; min TTL [1h]
What is the name of the authoritative DNS server for the domain, and how often will secondary servers check in for updates?
DNSRV1.anycomp.com, 600 seconds
DNSRV1.anycomp.com, 4 seconds
postmaster.anycomp.com, 600 seconds
DNSRV1.anycomp.com, 3,600 seconds
The SOA always starts by defining the authoritative server—in this case DNSRV1—followed by e-mail contact and a host of other entries. Refresh time defines the interval in which secondary servers will check in for updates—in this case, 3,600 seconds (1 hour). Note: in a zone file the semicolon (;) is the character used to denote comments.
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