Objective 1.12 Explain How Zone Transfers Work [multi Master, Master/slave, DNSExpress, Incremental/full, Updates (notify/expire)] 302 Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A company runs a pair of BIG-IP DNS systems as authoritative servers for example.com. The primary server is configured as the master and the second as a slave. The SOA refresh timer is set to 3600 seconds. An administrator updates a record on the master and wants the slave to reflect the change as quickly as possible without waiting for the refresh interval. What should the administrator rely on to trigger the slave to request a zone transfer?

   • AThe master sending a NOTIFY message to the slave
   • BThe slave's expire timer reaching zero
   • CThe administrator manually editing the zone file on the slave
   • DThe slave's retry timer expiring and forcing a transfer
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   What is the primary purpose of a DNS zone transfer between authoritative servers?

   • ATo cache DNS responses locally to reduce query latency
   • BTo resolve recursive queries by forwarding them to the root servers
   • CTo encrypt DNS queries between clients and resolvers
   • DTo synchronize the contents of a zone between authoritative servers so they serve consistent data
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   An organization is setting up a new slave server for a zone that is currently served by a master. The slave will be authoritative for the zone and must have a complete copy of all records. What is the first step the slave will take to obtain the zone data?

   • APerform an IXFR to get only recent changes
   • BSend a NOTIFY message to the master
   • CSend a zone transfer request (AXFR) to the master
   • DWait for the master to push the zone data automatically
   Reveal Solution Discussion Select an answer first
5. 24application · medium

   A company has a master BIG-IP DNS system and several slaves. The slaves are configured to check for updates every 3600 seconds. The administrator wants to reduce the load on the master by having slaves check less frequently, but still wants updates to propagate quickly. What is the best approach?

   • AEnable DNSExpress on the slaves
   • BIncrease the refresh timer and enable NOTIFY
   • CIncrease the expire timer
   • DDecrease the refresh timer and disable NOTIFY
   Reveal Solution Discussion Select an answer first
6. 25foundation · easy

   How does a slave server initially obtain a copy of a zone?

   • AIt queries the root servers for the zone contents
   • BIt generates the zone locally from cached responses
   • CIt receives the zone via email from the administrator
   • DIt performs a full zone transfer (AXFR) from the master
   Reveal Solution Discussion Select an answer first