HOTSPOT
Your network contains a DNS server named Server1. Server1 hosts a DNS zone for contoso.com.
You need to ensure that DNS clients cache records from contoso.com for a maximum of one hour.
Which value should you modify in the Start of Authority (SOA) record? To answer, select the
appropriate setting in the answer area.
Answer: 
Explanation:
Minimum TTL – The minimum time-to-live value applies to all resource records in the
zone file. This value is supplied in query responses to inform other servers how long they should
keep the data in cache. The default value is 3,600.The Structure of a DNS SOA Record
https://support.microsoft.com/en-us/kb/163971
shouldn’t this be expires after, since he specifically said cache for a maximum of 1 hour
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Agreed Answer should be Expires After.
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No – correct answear is Minimum TTL.
Expires After is a period of time for which zone information is valid on the secondary server. If the secondary server can’t download data from a primary server within this period, the secondary server lets the data in its cache expire and stops responding to DNS queries. Setting Expires After 1 hour allows the data on a secondary server to be valid for 1 hour.
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