A zone has frequent small updates throughout the day. The administrator wants to ensure slaves stay current while minimizing the load on the master and network. Which configuration is most appropriate?

Disable NOTIFY and increase the refresh timer

Use only AXFR for all transfers

Set the expire timer to a very low value

Enable IXFR and NOTIFY on the master

What happens when a slave's 'expire' timer elapses without successful contact with the master?

The slave automatically becomes a master and starts accepting updates

The slave continues serving the zone indefinitely with stale data

The slave stops serving the zone and returns SERVFAIL for queries

The slave resets its refresh timer and tries again immediately

A slave server receives a NOTIFY message from the master but does not initiate a transfer. The slave's SOA serial is higher than the master's. What is the most likely explanation?

The slave's zone data is newer than the master's, so no transfer is needed

The refresh timer has not expired

The slave is not configured to accept NOTIFY

An organization runs two BIG-IP DNS systems as masters for the same zone, with slaves pulling from both. The administrator notices that slaves sometimes have conflicting data. The SOA serials on both masters are incremented correctly. What is the most likely cause of the conflict?

The slaves are using different transfer types

The refresh timer is set differently on each slave

NOTIFY is disabled on one master

Both masters are accepting dynamic updates, leading to divergent zone contents

F5Certified Technology Specialist, BIG-IP DNS

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Questions 31–34

31application · medium
A zone has frequent small updates throughout the day. The administrator wants to ensure slaves stay current while minimizing the load on the master and network. Which configuration is most appropriate?
Select an answer first
32foundation · easy
What happens when a slave's 'expire' timer elapses without successful contact with the master?
Select an answer first
33expert · hard
A slave server receives a NOTIFY message from the master but does not initiate a transfer. The slave's SOA serial is higher than the master's. What is the most likely explanation?
Select an answer first
34expert · hard
An organization runs two BIG-IP DNS systems as masters for the same zone, with slaves pulling from both. The administrator notices that slaves sometimes have conflicting data. The SOA serials on both masters are incremented correctly. What is the most likely cause of the conflict?
Select an answer first

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