Forward DNS Zones
The aforementioned DNS zones are all used for the mapping of humanly-practical, name-based domains to mostly numerically identified Internet resources. Such domain name resolution is also referred to as forward resolution and the DNS zones associated with such process are often referred to as forward zones.
The term arose as the opposite of reverse zones, used for the reverse process, namely the process of finding the DNS name associated with an IP address, for example. Such reverse zones are maintained in the Internet Address and Routing Parameter Area (domain arpa).
Another common use of the term forward zone refers to a specific configuration of DNS name servers, particularly caching name servers, in which resolution of a domain name is forwarded to another name server that is authoritative for the domain in question, rather than being answered from the established cache memory.
Read more about this topic: DNS Zone
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