Zónaátvitel

Zónaátvitel, also known as zone transfer, is a process in the Domain Name System (DNS) where a DNS server copies the contents of its zone file to another DNS server. This process is essential for maintaining consistency and redundancy in DNS data across multiple servers. Zone transfers can be initiated by a secondary DNS server requesting an update from a primary DNS server, or by a DNS server notifying another server of changes.

There are two main types of zone transfers: AXFR (Asynchronous Full Transfer) and IXFR (Incremental Transfer). AXFR is a full transfer of the entire zone file, while IXFR transfers only the changes that have occurred since the last transfer. This makes IXFR more efficient for large zones with frequent updates.

Zone transfers are typically secured using Transaction Signatures (TSIG) to prevent unauthorized access and ensure data integrity. TSIG uses a shared secret key between the DNS servers to authenticate the transfer process.

Zónaátvitel is a critical function in DNS infrastructure, enabling the distribution of DNS data across multiple servers to improve reliability, performance, and fault tolerance. It ensures that DNS queries are answered accurately and efficiently, even in the event of server failures or network issues.