Learn DNS Series (ii) Understanding the primary DNS suffix option for a computer

Originally in this verse to explain the installation of DNS, but I found that in fact before this, but also need to explain a few basic concepts, first of all, the DNS suffix.

In the previous basic chapters, we know that a domain name can be divided into the main and suffix 2 parts, where the host we can understand as a host or a network terminal name, the suffix directly determines the nature of the domain name, categories and other important features. We will start from a single machine, understand the click of the DNS suffix in the end is how it is clear, and then to understand the combination of ad with the DNS will be easier. Where do you find the DNS suffix of the stand-alone machine? Let's look at it together:

To facilitate the experiment, I made a topology map, as follows:

The diagram above has made clear the relationship between the two, and XP2 is now an ordinary client, to join the domain.

We open the XP2 attribute and find its DNS suffix inside, as shown in the following figure:

From the above figure we can see that by default the computer's DNS suffix is blank. But please note that the figure is the primary DNS suffix, why is the Lord? Does the DNS suffix also have primary and secondary points?? In fact, this is the main DNS suffix for this host, in contrast, each network card can also set their own DNS suffix, and those settings are exactly binding on a certain network connection DNS suffix, this part of the content in the following will be detailed.