A company has a very large zone (over 100,000 records) and multiple slaves. The administrator notices that zone transfers are slow and consume excessive bandwidth. DNSExpress is enabled, but transfers are still slow. What additional factor might be limiting the benefit of DNSExpress?

The slaves are not configured with a high enough expire timer

The slaves are configured to use IXFR, which DNSExpress does not accelerate

The SOA refresh timer is set too low

The master is using UDP for transfers

What is the purpose of a DNS NOTIFY message?

To update the root servers with new TLD information

To inform slave servers that the zone has changed and they should check for updates

To inform clients that a query failed

To request a full zone transfer from the master

An administrator updates a record in a zone on the master BIG-IP DNS system. The slave server is configured with a refresh interval of 7200 seconds. The administrator wants the slave to update within seconds of the change. What must be configured on the master to achieve this?

A higher SOA serial number on the slave

NOTIFY to the slave's IP address

A lower retry timer on the slave

A lower expire timer on the slave

An organization has a large zone with thousands of records and multiple slave servers across geographically distributed sites. Zone transfers currently consume significant bandwidth and take several seconds to complete. The administrator wants to reduce transfer time and bandwidth usage while keeping all slaves synchronized. Which BIG-IP DNS feature should be enabled?

Increasing the SOA refresh timer

Configuring the zone as read-only on slaves

A slave server for a critical zone has been unable to contact its master for several days due to a network outage. The SOA parameters are refresh=3600, retry=600, expire=86400. The outage has now lasted 48 hours. What is the state of the slave's zone data?

The slave still serves the zone because the refresh timer has not expired

The slave continues to serve the zone indefinitely

The slave will perform a full zone transfer immediately

The slave has discarded the zone data and will respond with SERVFAIL

F5Certified Technology Specialist, BIG-IP DNS

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Questions 26–30

26expert · hard
A company has a very large zone (over 100,000 records) and multiple slaves. The administrator notices that zone transfers are slow and consume excessive bandwidth. DNSExpress is enabled, but transfers are still slow. What additional factor might be limiting the benefit of DNSExpress?
Select an answer first
27foundation · easy
What is the purpose of a DNS NOTIFY message?
Select an answer first
28application · medium
An administrator updates a record in a zone on the master BIG-IP DNS system. The slave server is configured with a refresh interval of 7200 seconds. The administrator wants the slave to update within seconds of the change. What must be configured on the master to achieve this?
Select an answer first
29application · medium
An organization has a large zone with thousands of records and multiple slave servers across geographically distributed sites. Zone transfers currently consume significant bandwidth and take several seconds to complete. The administrator wants to reduce transfer time and bandwidth usage while keeping all slaves synchronized. Which BIG-IP DNS feature should be enabled?
Select an answer first
30expert · hard
A slave server for a critical zone has been unable to contact its master for several days due to a network outage. The SOA parameters are refresh=3600, retry=600, expire=86400. The outage has now lasted 48 hours. What is the state of the slave's zone data?
Select an answer first

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