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This article is to share with you about what dns exception means. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Dns exception is a server failure, and the address of the server can not be found. DNS resolution is the actual addressing mode of most Internet applications; the re-development of domain name technology and a variety of applications based on domain name technology have enriched Internet applications and protocols.

The DNS service exception is a server failure and the address of the server cannot be found.

Importance of DNS

1. From a technical point of view

DNS resolution is the actual addressing method for most Internet applications; the re-development of domain name technology and a variety of applications based on domain name technology have enriched Internet applications and protocols.

2. From the perspective of resources

Domain name is the identity of the Internet, is the unique identification resources that can not be repeated; the globalization of the Internet makes the domain name become a national strategic resource to identify a country's sovereignty.

Main functions of DNS

Each IP address can have a host name, which consists of one or more strings separated by a decimal point. With a hostname, don't memorize the IP address of each IP device, just remember the hostname that is relatively intuitive and meaningful. This is the function of the DNS protocol.

There are two ways to map hostnames to IP addresses:

1) static mapping, host-to-IP address mapping is configured on each device, and each device maintains its own mapping table independently, and is only used by this device.

2) dynamic mapping to establish a domain name resolution system (DNS), which only configures host-to-IP address mapping on special DNS servers. Devices on the network that need to communicate with hostnames first need to query the corresponding IP address of hosts from the DNS server.

The process of getting the IP address corresponding to the host name through the host name is called domain name resolution (or host name resolution). When resolving domain names, we can first use the method of static domain name resolution, and then use the method of dynamic domain name resolution if the static domain name resolution is not successful. Some commonly used domain names can be put into the static domain name resolution table, which can greatly improve the efficiency of domain name resolution.

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