What are the common types of domain name resolution records?
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In the domain name resolution process, domain name resolution records play a key role. Different types of domain name resolution records are used to specify specific targets, thereby mapping domain names to corresponding IP addresses, servers, or mailboxes. The following will introduce several common types of domain name resolution records and their roles and uses in domain name resolution.
1. A record (Address Record):
A record is one of the most common types of domain name resolution records. It maps a domain name to an IPv4 address. When a user enters a domain name in a browser, the operating system sends a request to the DNS server, and the DNS server returns the IP address in the A record associated with the domain name. The browser can find the correct server through the IP address and load the web page content.
2. CNAME record (Canonical Name Record):
CNAME records are used to create an alias for a domain name and map one domain name to another. When a domain name has multiple subdomains and these subdomains need to point to the same server, you can use CNAME records. For example, if there is a domain name www.example.com and you want to point it to example.com, you can create a CNAME record to resolve www.example.com to example.com.
3. MX Record (Mail Exchanger Record):
MX records are used to specify the mail server that handles emails associated with a domain name. When someone sends an email to a domain name, the email server queries the MX record of the domain name to find the server responsible for receiving and processing emails for the domain name. Through the MX record, the mail traffic of the domain name can be correctly routed to the corresponding mailbox server.
4. TXT Record (Text Record):
TXT records store arbitrary text information associated with a domain name. It is often used to verify the ownership of a domain name, configure anti-spam policies, or provide other verification information. For example, some mail service providers require that a specific verification key be added to the TXT record of a domain name to confirm domain name ownership.
5. AAAA Record (IPv6 Address Record):
AAAA record is the IPv6 version of A record. It maps a domain name to an IPv6 address. With the popularity of IPv6, AAAA records play an important role in network environments that support IPv6.
In summary, A records map domain names to IPv4 addresses, CNAME records create domain name aliases, MX records specify servers that handle mail, TXT records store arbitrary text information, and AAAA records map domain names to IPv6 addresses. Understanding these common types of domain name resolution records and their functions and uses will help you correctly configure and manage domain name resolution and ensure the normal operation of websites and mail services.
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