Zone Transfer. When the primary server detects a change to its zone data it notifies the secondary servers. One should configure the master dns server to allow zone transfers only from secondary slave.
A dns zone transfer is basically a file transfer of the zone database from a primary to a secondary server when notified. The dns zone name that we will replicate is mylablocal. This is generally considered a security issue as it can reveal host namessub domains or other dns records that you dont want disseminated to the public.
When teaching and when talking to clients i sometimes have to explain the security problems related to dns zone transfer.
Dns zone transfers using the axfr protocol are the simplest mechanism to replicate dns records across dns servers. Dns servers within a domain are organized using a master slave method where the slaves get updated dns information from the master dns. A zone transfer forces a check of the version number in the master server start of authority soa record. If you are planning to pass through uk immigration you must complete a mandatory 10 day quarantine period at a hotel at heathrow.