What is the zone file?

The zone file is a text document used by a domain name system (DNS) to map computers, domain names and various sources to the relevant address of the Internet protocol (IP). This mapping allows people to access resources and computers on the Internet using human addresses. The zone files generally consist of two parts: resource guidelines and records. Directives

begin with the dollar brand and contain information that relate to the entire set of zones, such as life time ($ TTL). TTL is the default amount of time. For example, if $ TTL is set to 86,400 seconds (24 hours), the server name that approaches this file zone will save its copy for 24 hours before attempting the updated version. Note that the records of each resource may include unique TTL information that rewrses this default value. The domain of the fault for all hosts included in the zone and $ file, which allows the files to contain the content of other text files. Use$ Include files provides administrators the possibility to logically organize and separate file sources records. This prevents the need to add hundreds of records to one file.

Source records are file items that define DNS information about a particular host or source. Although there are dozens of types of sources defined by the working group for Internet engineering (IETF), most commonly used are:

• Recording - address recording of the Internet protocol version 4 (IPv4). These records map specific hosts on their assigned IP addresses.
• MX Record - Record of Mail Exchange. MX records show the name of the postal servers for this DNS zone. The zone file can contain multiple MX records, each of which has preferences specified with each other.
• Recording CNAME - Recording of the canon name. CNAME records are similar to records but instead of IP adResy are used to map one name in another name.
• recording NS - server name records. These records define which name servers are authoritative for the domain referred to the zone file.
• SOA Record - start of authority record. SOA records define parameters that affect the entire zone. These records are essential for DNS to work properly, especially file transfers between primary and secondary DNS servers.

SOA Record lists, including information, root domain name for zone, serial number of zone file and recovery interval. The recovery interval is the amount of time of secondary DNS servers to be released before attempting to copy the zone from the primary server. DNS secondary servers use the serial number to determine whether a copy you already have.