Many WordPress site administrators process DNS only once for each blue gate. It is mainly when purchasing a new domain, setting up a new website and migrating to a new web host. However, DNS is the core of the Internet. Small mistakes in DNS records may cause visitors to be unable to access the website or send e-mail. Therefore, a basic understanding of its working mode is very important. The good news is that DNS is very easy to understand and manage. This document describes what all WordPress site owners and administrators know about DNS and DNS records.
What is DNS? DNS is the domain name system. A hierarchical naming system used on the Internet. Its function is www.wpwhitesecurity. Convert easy to remember domain names such as com into IP (Internet Protocol) addresses that can be understood by the computer, such as 192.124.249.168. Why do I need DNS? All computers, smartphones or devices connected to the Internet or network have their own IP addresses. For example, www.wpwhitesecurity. Com website is hosted by a web server with IP address 192.124.249.168.
The website name (www.wpwhitesecurity. Com) is easy to remember, but the IP address (192.124.249.168) is not remembered. Therefore, DNS is required to convert the human readable text (domain name) into the information IP address that the computer can understand. Otherwise, you should remember the IP address, not the. What are domains and fqdns? Before understanding DNS, let’s take a look at what domain and FQDN are. FQDN (regular domain name) is usually the website URL or www.wpwhitesecurity. And com are the same domain. FQDN consists of several parts:
All parts of FQDN such as WWW subdomain can contain up to 63 characters. The entire FQDN cannot exceed 253 characters. The commonly used sub domains on the Internet include WWW, blog, site, admin, etc. The most common TLD on the Internet is. com, . net, . Org and. NL and. TLD of the same country as Mt. How DNS works www.wpwhitesecurity. Let’s see what happens when we browse websites like com. This is a high-level explanation for understanding the logic behind DNS. In fact, the site involves more components that may affect the working mode of DNS, such as DNS cache, root DNS server, etc.
Step 1: request to confirm the domain name as the IP address, and in the navigation bar of the web browser, click www.wpwhitesecurity. When entering com, the smartphone or computer must know the IP address of the web server hosted by the website. Because I don’t know the IP address, www.wpwhitesecurity. Send a request to the DNS server to verify com. The DNS server used by the device may be one of the network routers or ISPs. This is usually automatically configured by the network interface of the device when connecting to the network. Step 2: recursive DNS server requests the name server of the domain. Network and ISP DNS servers do not store domain data, so they are called recursive DNS servers. Instead, forward the query to another DNS server and resend the answer.
Therefore, the DNS server connected to the device is connected to other DNS servers (such as root server) of the parent in the hierarchical structure, so as to realize wpwhitesecurity. Get the IP address of NS (name server) of COM domain. NS (name server) is a DNS server that contains domain information. Each domain has several ns (name servers) and returns DNS
Whenever the server needs to check the IP address of the responsible domain, it will respond to the query. When you purchase a domain, configure a name server (NS) for the domain. In the screenshot below, wpwhitesecurity. View the NS (name server) configuration of the COM domain.
Step 3: return to the DNS server and ask the name server to confirm the FQDN. In this step, the recursive DNS server to which the device is connected contains a list of name servers for the domain to navigate. Therefore, FQDN www.wpwhitesecurity. Send a request to one of the servers to confirm com as the IP address. The answer is 192.124.249.168. Step 4: the regression DNS server will respond with an IP address. Now FQDN www.wpwhitesecurity connects to the device’s regression DNS server. Com has an IP address, please send it back to the device.
Step 5: connect the device to the web server. Your device is connected to the web server with the corresponding IP address received from the DNS server, www.wpwhitesecurity. Request a com page. The web server responds to the browser by sending HTML data to start ing and rendering. Domain and DNS registration now we know that each domain must have at least a name server. Ideally, there should be two or more. Therefore, when you purchase a new domain, you will be prompted to enter the IP address or FQDN of the name server. Typically use the Registrar’s own name server, unless hosting your own DNS or using a third-party solution.
DNS record type DNS can be used to obtain other information about the domain, such as the IP address of the mail server. This information is available through various types of DNS records. Although there are more than 50 different types of DNS records, as the owner of the WordPress site, it would be good if you knew the following. Record this is the most common DNS record type. Used to map a host name or FQDN to an IP address. This is a record commonly used in the domain name resolution process mentioned above.
CNAME records the alias records used when two different fqdns have the same IP. For example, wpwhitesecurity. COM and www.wpwhitesecurity. Com on the same web server. Therefore, as shown in the following table, wpwhitesecurity. Create a record for COM and wpwhitesecurity. Point to www.wpwhitesecurity on COM. CNAME was created for com. Male name type value male wpwhitesecurity. com
| [email If an email is sent to a protected server, the DNS server of the mail server knows that the information in the record must be used to connect and the IP address of the email server that sent the email. NS name server record. The IP address of the authorized name server used to specify the domain. You should specify these when you purchase the domain, as described above. Txt records DNS can also be used to store records related to public keys, domain related locations, and anti spam frameworks. Txt records are usually the DNS record type used for these records. It was originally used for human readable text, but now most machines store readable data. A system used to prevent spam, such as SPF, dkim records, etc. Returns d to minimize DNS cache and TTL traffic and resources The NS server caches DNS records within the time specified by the TTL (time to live) value. TTL is assigned to all DNS records in seconds, the same as the expiration date. Caching is why DNS record changes can take hours and days to propagate to all locations. The propagation time is also affected by the TTL value set for the record. Setting a high TTL value can take a long time to propagate DNS record changes. No DNS, no team! Without DNS, the Internet would not be like what we know today! Understanding the basic knowledge of DNS and the reasons why DNS is needed to run word press sites will help to better manage sites and domains. The original specifications of DNS records and bizarre DNS were published by IETF as RFC 882 and RFC 883 in 1983. In 1987, these RFCs were replaced by RFC 1034 and RFC 1035 and updated through multiple different RFCs. The DNS server runs on port 53 UDP for message delivery and uses port 53 for zone transmission on TCP. For more technical information about DNS, it is recommended to read the following: Wikipedia’s domain name system (DNS) list of Wikipedia’s DNS record types 
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