Learn DNS Series (iii) Understanding multiple DNS suffix options for a computer

The previous section describes some of the main DNS suffixes of the computer, and today this section continues to extend this topic, as well as other concepts related to it.

The test environment in this section is a simple topology environment in which a DC is connected to a client computer. The following figure:

In the WINS series, we said that when a ping program is used to access a name, if a WINS server is set up, a resolution request is sent to the server, whereas the system will use the NBNS service to resolve the name by broadcasting. The following figure:

However, when we ping a name that resembles a domain name structure, such as Ping sss.com, the system will be processed in two different cases.

When a DNS server is not set in the native network card properties, the system still resolves the name using the NBNS service, although the name appears to have the structural characteristics of the domain name. The following figure:

As you can see from the image above, the NBNS service attempts to parse the noun sss.com rather than a domain name, because for the NBNS service, there is only the concept of the name, not the domain name.

After we have configured a valid DNS server address for it? The test results are shown below:

At first, the system sends a standard a record query request to the DNS server to see if a record such as sss.com exists, and after several unsuccessful attempts, the fourth packet is sent to the client by the DNS server, and the message is "server failure". Visible in this DNS area does not exist sss.com such a record.

So what does this have to do with the multiple DNS suffixes we're going to talk about today? In fact, when we configure a variety of DNS suffixes for the system, when you ping a name, the system automatically adds the specified DNS suffix after the name and resolves the name, which is the real parsing of a domain name, including the principal name and the set DNS suffix.

How do I set these DNS suffixes? In Windows systems, there are many places to set up. Let's describe each of these.