Re. "primary", it is worth noting the definition of the SOA MNAME field in RFC 
1035:

MNAME           The <domain-name> of the name server that was the original or 
primary source of data for this zone.

I get the impression that sometimes people regard a zone as having one primary 
or master and all its other servers are secondaries or slaves. But sometimes 
(eg when configuring slave zones in BIND) you get a per-xfer view of the 
terminology.

Tony.
-- 
f.anthony.n.finch  <d...@dotat.at>  http://dotat.at

> On 2 Apr 2015, at 20:51, Paul Hoffman <paul.hoff...@vpnc.org> wrote:
> 
> Tony.
> -- 
> f.anthony.n.finch  <d...@dotat.at>  http://dotat.at
> 
> 
> Primary servers and secondary servers --- These are synonyms for "master 
> server" and "slave server",
> which were the terms used in the early DNS RFCs, and defined below. The 
> current common usage has
> shifted to "primary" and "secondary".
> 
> Slave server --- An authoritative server which uses zone transfer to retrieve 
> the zone.
> (Quoted from {{RFC1996}}, section 2.1)
> {{RFC2182}} describes slave servers in detail.
> 
> Master --- Any authoritative server configured to be the source of zone 
> transfer
> for one or more slave servers. (Quoted from {{RFC1996}}, section 2.1)
> {{RFC2136}} defines "master" as "an authoritative server configured to be the 
> source of AXFR or IXFR
> data for one or more slave servers".
> 
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