A Record
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... SRV records; each SRV record points to several A record lookups.
Even though a particular client ...
... client attempts to reach the server with the lowest PREF in
the SRV list -- looking up the A record for the SRV record's
target ...
... client attempts to reach the second server in the SRV list
and looks up the A record for backup.em.example.com.
8. The client ...
...
8. The client gets the A record with the IP address for
backup.em.example.com from example.com's NS ...
... include appropriate NAPTR, SRV, or A records in the Additional
Information portion of the DNS packet. Clients ...