Discussion
What are the highly stable and highly volatile values that are assigned to the information in Time-to-live field ?
Answer: A
The values are 86400 and 60 seconds.
In DNS resource records, the Time-to-live field says how long a cached record may be kept. Tanenbaum gives the example that highly stable information is assigned a large value such as 86400, the number of seconds in one day, and highly volatile information a small value such as 60, one minute.
The other pairs are not the textbook values; 36000 seconds is ten hours, and 0 would forbid caching altogether.
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