What is DNS? The Chinese interpretation of DNS is the domain name resolution service, which is the abbreviation for Domain Name service. The primary role of the DNS server is to provide resolution between the domain name and the IP address.
The development of domain name parsing is divided into three steps, the first is the distribution of the analysis, the resolution of each host is responsible for, and centralized parsing is done by a host, the last is to be distributed and centralized, that is, DNS.
DNS query methods are divided into two types, one is recursive query, is initiated by the client, and the other is the iterative query, is initiated by the server side.
Record type of DNS server:
First introduces a record, that is, the host record, the main role is to add a record, delete a record, empty domain name resolution, the resolution of the generic domain name, the use of DNS to achieve simple load balancing.
The SOA record, which is the starting authorization record, means which of the primary servers in this zone are and the relationship between the primary server and the secondary server. The serial number in the SOA record means that the version of the data modification is recorded; The primary server means the primary server responsible for this area; the owner means the administrator, using the admin mailbox, and the @ sign of the mailbox must be replaced by the point in the English state; the refresh interval refers to the replication interval of the data The retry interval is the interval between refreshes if the server communicates with the secondary server, and the expiration time refers to the failure of the secondary server if the secondary server has not contacted the primary server after the specified time, and the TTL refers to the time the data is cached.
The NS record, the name server, is what server load resolution is in this area.
CNAME record, which is the alias record, meaning the alias of the host record.
MX record, or mail exchanger.
PTF record, which is the reverse pointer.
about what is a DNS server and its record types