312-50V9 · Question #540
You have the SOA presented below in your Zone. Your secondary servers have not been able to contact your primary server to synchronize information. How long will the secondary servers attempt to…
The correct answer is C. One week. The SOA expire field (604800 seconds) defines how long a secondary DNS server will attempt to reach the primary before declaring the zone dead and stopping query responses.
Question
You have the SOA presented below in your Zone. Your secondary servers have not been able to contact your primary server to synchronize information. How long will the secondary servers attempt to contact the primary server before it considers that zone is dead and stops responding to queries? collegae.edu.SOA, cikkye.edu ipad.college.edu. (200302028 3600 3600 604800 3600)
Options
- AOne day
- BOne hour
- COne week
- DOne month
How the community answered
(22 responses)- A5% (1)
- B18% (4)
- C68% (15)
- D9% (2)
Why each option
The SOA expire field (604800 seconds) defines how long a secondary DNS server will attempt to reach the primary before declaring the zone dead and stopping query responses.
One day equals 86400 seconds, which does not match the expire field value of 604800 seconds in this SOA record.
One hour equals 3600 seconds, which corresponds to the refresh, retry, and minimum-TTL fields in this record, but not to the expire field at position four.
The SOA record fields follow the order: serial, refresh, retry, expire, minimum-TTL. In this record, the expire value is 604800 seconds, which equals exactly 7 days (one week). After this duration elapses without successfully contacting the primary server, the secondary marks its zone data as expired and stops answering queries for that zone to prevent serving stale information.
One month is approximately 2592000 seconds, which is nearly four times larger than the 604800-second expire value specified in this SOA record.
Concept tested: DNS SOA record expire field interpretation
Source: https://www.rfc-editor.org/rfc/rfc1035
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