Objective 1.12 Explain How Zone Transfers Work [multi Master, Master/slave, DNSExpress, Incremental/full, Updates (notify/expire)] 302 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   After receiving a NOTIFY message, what does a slave server do?

   • AIt queries the master's SOA record to see if the zone version has changed
   • BIt immediately sends an AXFR request without checking the serial
   • CIt sends a NOTIFY back to the master to acknowledge receipt
   • DIt ignores the NOTIFY and waits for the next refresh interval
   Reveal Solution Discussion Select an answer first
2. 7application · medium

   A slave server has been unable to reach the master for 12 hours. The SOA parameters are refresh=3600, retry=600, expire=86400. The slave has successfully refreshed before the outage. What is the current state of the slave's zone data?

   • AThe slave is still serving the zone because the expire timer has not been reached
   • BThe slave has discarded the zone data
   • CThe slave is serving the zone but with a warning
   • DThe slave is performing a full zone transfer
   Reveal Solution Discussion Select an answer first
4. 8expert · hard

   A company operates two BIG-IP DNS systems as masters for the same zone, with several slaves pulling from both. An administrator notices that some slaves have stale records while others are current. The SOA serial numbers on the two masters are identical, but the zone contents differ. What is the most likely cause of this inconsistency?

   • ADNSExpress is enabled on only one master
   • BThe slaves are configured with different refresh timers
   • CThe slaves are using AXFR instead of IXFR
   • DThe SOA serial numbers were not incremented after changes on one master
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   When is a full zone transfer (AXFR) typically used?

   • AWhen a slave server is first configured or when incremental transfers are not supported
   • BWhen only a single record needs to be updated
   • CWhen the zone is small and changes are frequent
   • DWhen the master server is under heavy load
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   How does DNSExpress improve synchronization efficiency compared to standard zone transfers?

   • ABy sending only the changes (deltas) instead of the entire zone when possible
   • BBy compressing the zone data with a proprietary algorithm
   • CBy using UDP instead of TCP for all transfers
   • DBy transferring the zone only once and never updating it again
   Reveal Solution Discussion Select an answer first