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.
Hot 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