Chapter 1 Dns Configuration; Dns Overview; Static Domain Name Resolution - H3C S5500-EI series Operation Manual

Operation Manual – DNS
H3C S5500-EI Series Ethernet Switches

Chapter 1 DNS Configuration

When configuring DNS, go to these sections for information you are interested in:

DNS Overview

Configuring the DNS Client
Configuring the DNS Proxy
Displaying and Maintaining DNS
DNS Configuration Examples
Troubleshooting DNS Configuration
Note:
This document only covers IPv4 DNS configurations. For introduction to IPv6 DNS
configurations, refer to IPv6 Configuration.
1.1 DNS Overview
Domain Name System (DNS) is a distributed database used by TCP/IP applications to
translate domain names into corresponding IP addresses. With DNS, you can use
easy-to-remember domain names in some applications and let the DNS server
translate them into correct IP addresses.
There are two types of DNS services, static and dynamic. After a user specifies a name,
the device checks the local static name resolution table for an IP address. If no IP
address is available, it contacts the DNS server for dynamic name resolution, which
takes more time than static name resolution. Therefore, some frequently queried
name-to-IP address mappings are stored in the local static name resolution table to
improve efficiency.

1.1.1 Static Domain Name Resolution

The static domain name resolution means setting up mappings between domain
names and IP addresses. IP addresses of the corresponding domain names can be
found in the static domain resolution table when you use applications such as telnet.
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Chapter 1 DNS Configuration