Caching DNS Server Using Unbound on CentOS 7 on LAN

Here is how to setup your own caching DNS server with Unbound on CentOS 7.

A caching DNS server just caches results from queries that clients ask. If a client asks it to resolve technichristian.net, the caching DNS server asks the authoritative name server responsible for the appropriate zone to resolve it, and caches the answer. If another client asks it to resolve the same record, the caching DNS server can answer from its cache.

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