June 2018
Intermediate to advanced
368 pages
11h 1m
English
Content preview from Managing Mission - Critical Domains and DNS
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Minimum
This meaning of this field has changed.
Originally this was how long resolvers (also known as recursors, non-authoritative nameservers) would keep a reply from an authoritative nameserver in its local cache, and answer subsequent queries for those records from its local cache before it will refresh those records from one of the authoritative nameservers. In other words, this value used to specify the default Time-to-Live (TTL) for each record within a zone that did not have an explicit TTL setting.
It later became the Negative Cache TTL (as per RFC 2308); the interval resolvers would cache a lookup with a negative result (unless the SOA's TTL is lower, in which case that would be used).
RFC2308 also described the $TTL directive, which ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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