zone transfer
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The acronym UAS is commonly stands for User Agent Server. User Agent Server is a logical part of SIP implementation which it receives SIP requests and generates.
Use ShinyGTS, a distribution software available on ProjectPokemon.org's forums.
Secondary DNS gets its records from the Primary DNS Server. The secondary DNS is essentially there in case the primary DNS doesn't respond.
False. The DNS records cannot be added directly to the secondary DNS zone. The secondary DNS zone can receive the updated records only from the primary DNS zone of the DNS server.
False Zone transfer are always initiated at the secondary server for a zone and sent to their configured master servers.
Primary Means, it is individual there is no dependence, But Secondary will allays depends on Primary, If you want to do Secondary, you should complete primary first, There is no precondition to primary, but for Secondary Primary is the Precondition, first you should do primary, then only you are able to do secondary.
What is (the name?) (of) a secondary server (who) takes over in case of primary server failure? That would be a BDC. A Backup Domain Controller.
It means, you do not have secondary DNS server.
SOA Resource Records Every zone contains a Start of Authority (SOA) resource record at the beginning of the zone. SOA resource records include the following fields: * The Owner , TTL , Class , and Type fields, as described in "Resource Record Format" earlier in this chapter. * The authoritative server field shows the primary DNS server authoritative for the zone. * The responsible person field shows the e-mail address of the administrator responsible for the zone. It uses a period (.) instead of an at symbol (@). * The serial number field shows how many times the zone has been updated. When a zone's secondary server contacts the master server for that zone to determine whether it needs to initiate a zone transfer, the zone's secondary server compares its own serial number with that of the master. If the serial number of the master is higher, the secondary server initiates a zone transfer. * The refresh field shows how often the secondary server for the zone checks to see whether the zone has been changed. * The retry field shows how long after sending a zone transfer request the secondary server for the zone waits for a response from the master server before retrying. * The expire field shows how long after the previous zone transfer the secondary server for the zone continues to respond to queries for the zone before discarding its own zone as invalid. * The minimum TTL field applies to all the resource records in the zone whenever a time to live value is not specified in a resource record. Whenever a resolver queries the server, the server sends back resource records along with the minimum time to live. Negative responses are cached for the minimum TTL of the SOA resource record of the authoritative zone.
A second DNS server helps in synchronization of DNS data from primary to secondary.
SOA Resource Records Every zone contains a Start of Authority (SOA) resource record at the beginning of the zone. SOA resource records include the following fields: * The Owner , TTL , Class , and Type fields, as described in "Resource Record Format" earlier in this chapter. * The authoritative server field shows the primary DNS server authoritative for the zone. * The responsible person field shows the e-mail address of the administrator responsible for the zone. It uses a period (.) instead of an at symbol (@). * The serial number field shows how many times the zone has been updated. When a zone's secondary server contacts the master server for that zone to determine whether it needs to initiate a zone transfer, the zone's secondary server compares its own serial number with that of the master. If the serial number of the master is higher, the secondary server initiates a zone transfer. * The refresh field shows how often the secondary server for the zone checks to see whether the zone has been changed. * The retry field shows how long after sending a zone transfer request the secondary server for the zone waits for a response from the master server before retrying. * The expire field shows how long after the previous zone transfer the secondary server for the zone continues to respond to queries for the zone before discarding its own zone as invalid. * The minimum TTL field applies to all the resource records in the zone whenever a time to live value is not specified in a resource record. Whenever a resolver queries the server, the server sends back resource records along with the minimum time to live. Negative responses are cached for the minimum TTL of the SOA resource record of the authoritative zone.
Secondary Zone
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Secondary zone When a zone that this DNS server hosts is a secondary zone, this DNS server is a secondary source for information about this zone. The zone at this server must be obtained from another remote DNS server computer that also hosts the zone. This DNS server must have network access to the remote DNS server that supplies this server with updated information about the zone. Because a secondary zone is merely a copy of a primary zone that is hosted on another server, it cannot be stored in AD DS.