What is the main advantage of an incremental zone transfer (IXFR) over a full transfer (AXFR)?

It transfers only the changes, reducing bandwidth and processing time

It eliminates the need for SOA timers

It uses UDP, which is faster than TCP

It works without any coordination between master and slave

A company is designing a DNS architecture with two BIG-IP DNS systems acting as masters and four slaves. The slaves should be able to obtain zone data from either master. What is the primary requirement for this to work correctly?

The slaves must use IXFR exclusively

The slaves must be configured with a higher expire timer

The masters must use DNSExpress

Both masters must have consistent zone data and incrementing SOA serials

What does an AXFR response contain?

A list of all authoritative servers for the zone

The SOA record only, to indicate the zone version

The complete set of resource records for the zone

Only the records that have changed since the last transfer

What is a common reason to deploy multiple masters in a DNS environment?

To provide redundancy and allow updates to be accepted at multiple points

To reduce the need for zone transfers by having all data pre-loaded

To automatically resolve conflicts without human intervention

To eliminate the need for slaves entirely

What does the 'refresh' timer in the SOA record control?

How long a slave waits before retrying after a failed transfer

How often a slave checks with the master for zone updates

How long a slave keeps serving stale data after the master is unreachable

How long a resolver caches a negative response

F5Certified Technology Specialist, BIG-IP DNS

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Questions 16–20

16foundation · easy
What is the main advantage of an incremental zone transfer (IXFR) over a full transfer (AXFR)?
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17application · medium
A company is designing a DNS architecture with two BIG-IP DNS systems acting as masters and four slaves. The slaves should be able to obtain zone data from either master. What is the primary requirement for this to work correctly?
Select an answer first
18foundation · easy
What does an AXFR response contain?
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19foundation · easy
What is a common reason to deploy multiple masters in a DNS environment?
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20foundation · easy
What does the 'refresh' timer in the SOA record control?
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