Your network contains a DNS server named Server1 that runs Windows Server 2012. Server1 has a zone named contoso.com. The network contains a server
named Server2 that runs Windows Server 2008 R2. Server1 and Server2 are members of an Active Directory domain named contoso.com. You change the IP
address of Server2. Several hours later, some users report that they cannot connect to Server2. On the affected users’ client computers, you flush the DNS client
resolver cache, and the users successfully connect to Server2. You need to reduce the amount of time that the client computers cache DNS records from
contoso.com. Which value should you modify in the Start of Authority (SOA) record?
To answer, select the appropriate setting in the answer area.
Hot Area:
Answer: 
should be minium ttl
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Correct, answer is Minimum (default) TTL:
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https://msdn.microsoft.com/en-us/library/bb727018.aspx
Minimum (Default) TTL
The minimum time-to-live value for cached records on a secondary server. The value is set in the format Days : Hours : Minutes : Seconds. When this value is reached, the secondary server expires the associated record and discards it. The next request for the record will need to be sent to the primary server for resolution. Set the minimum TTL to a relatively high value, such as 24 hours, to reduce traffic on the network and increase efficiency. However, keep in mind that a higher value slows down the propagation of updates through the Internet.
TTL For This Record
The time-to-live value for this SOA record itself. The value is set in the format Days : Hours : Minutes : Seconds and generally should be the same as the minimum TTL for all records.
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