What is a domain on a computer? What is a domain name? Maintenance and administration
In the domain
In the working group
Differences home network from the network at work
Changing the user account type
At Windows installation will need to create account user. It will be an administrator account that allows you to configure your computer and install any programs. After you finish setting up your computer, we recommend using a standard account for everyday use. New user accounts must be created as standard accounts. Using standard accounts is more secure for your computer.
Necessary actions will depend on whether the computer is part of a domain or workgroup.
Computers on home networks are usually part of workgroups, while computers on workplace networks are usually part of domains. The main difference between workgroups and domains is how they are managed network resources.
· All computers are peer nodes on the network; no one computer can control another.
· Each computer has multiple user accounts. To use any computer that belongs to a workgroup, you must have your own account on that computer.
· If you have a user account on your computer, you can change the settings for it.
· Included working group Usually there are no more than ten to twenty computers.
· All computers must be on the same local network or subnet.
· One or more computers are servers. Network administrators use servers to control security and permissions for all computers in a domain. This makes it easy to change settings because changes are automatically made for all computers.
· If you have an account on a domain, you can log in to any computer. To do this, you do not need to have an account on the computer itself.
· If the computer is part of a domain, the user's ability to change its settings will most likely be limited. (Because network administrators want to make sure that computers are configured consistently and maintain control over them as much as possible.)
· There can be thousands of computers in a domain.
· Computers may belong to different local networks.
1. Open the “System” component by clicking the Start button, selecting Control Panel, System and Maintenance, and SYSTEM.
2. Next to Computer Name, Domain Name, and Workgroup Settings there will be a corresponding "Workgroup" or "Domain" label followed by the name.
Entering a computer into a domain Active Directory is a fairly simple procedure. In this article I will tell you how to add a computer running the Windows 7 operating system to an AD DC (Active Directory Domain Services) domain. A domain controller (DC) is a server with the OS installed Windows Server 2008.So, we have a PC that is in a WORKGROUP. To verify this, you need to enter the System properties. To do this, find on your desktop Windows shortcut"Computer":
Right click on it and from context menu select "Properties".
The Windows 7 operating system properties window will open:
Note the "Computer name, domain name, and workgroup settings" information area. The WorkGroup area shows WORKGROUP, indicating that this computer is not part of an Active Directory domain.Before adding a computer to an Active Directory domain, you must complete preparatory actions:
1. Find the “Local Area Connection” network connection icon, right-click on it and select “Properties”:
2. In the window that opens, select “Internet Protocol Version 4 (TCP/IPv4)” and click “Properties”:3. The “Properties: Internet Protocol Version 4 (TCP/IPv4)” window will open:
3.1 Activate the “Use the following IP address” option, and then specify the values for the IP address, subnet mask and default gateway.
3.2 Activate the “Use the following DNS server addresses” item and in the “Preferred DNS server” field, enter the address of the DNS server of your local network.
The end result should look something like this:
Click OK to save the settings. The preparatory steps before adding the computer to the Active Directory domain have been completed.Now let’s go back to the system properties and select “Change settings”:
In the window that opens, in the “Computer name” tab, select “Change”:
The “Change computer or domain name” window will open:
In the “Computer name” field, enter the name of your computer, which will be displayed in the domain (you can leave the local name). Next, activate the “Is a member of a domain” option and specify the domain to which you want to join your computer:
Then click OK.In the window that opens, you must enter the details (user and password) of a domain account that has the right to add new computers to this Active Directory domain, and click OK:
You can specify, for example, the name and password of the Domain Controller Administrator.
If everything is done correctly, you will see the “Welcome to Domain” window:
Click OK.A new window will open, informing you that you need to restart your computer for the changes to take effect:
Click OK.In the next window, select “Close”:
Now you can select “Restart now” or “Restart later”:
Selecting Restart Now will automatically restart your computer. Be sure to save all important data and close open programs.Now the window Windows greetings 7 looks different:
In my case, it is proposed to log in as a local user to the computer CLIETN1/user1 (CLIENT1 is the computer name, user1 is the user name). To log into the domain, click the “Change User” button.A new window will open:
To log into the Active Directory domain, select “Other user”.
In this window, enter the username and password for the account that exists in the domain:
In my example, the domain is called “denis.local” and the domain user name is “ivanov”. Below the “Password” field you can see the inscription “Login to DENIS”, which means that the login will be carried out as a domain user in the “denis.local” domain. In the “User” field you can specify “ivanov” or full name(domain name\username), i.e. “denis.local\ivanov” or “denis\ivanov”.So, we logged in from the computer “client1” under the domain user “ivanov” to the Active Directory domain “denis.local”. Let's open the system properties again:
Note the "Computer name, domain name, and workgroup settings" information area. The "domain" area contains the value "denis.local", indicating that this computer belongs to an Active Directory domain called "denis.local".Open the Start menu:
In this screenshot you can see the first and last name of the domain user “ivanov”.Now let’s go to the Active Directory domain controller, open the “Users and Computers” snap-in and in the “Computers” container of the “denis.local” domain we will see the name of the “CLIENT1” computer added to the domain:
Adding the computer to the Active Directory domain was completed successfully.
Hello, dear computer lovers and readers of the MyFirstComp.ru blog. Today we will look at a rather important topic that anyone has encountered or will definitely encounter in the near future. System Administrator. The corporate local network of a medium or large enterprise in 99% of cases has a domain structure. This is dictated, first of all, by the security policy of the enterprise. Thus, all computers on the network use the settings of the main computer - the domain (security can be provided by a firewall or defender, which can be easily disabled).
Now I propose to look at an example of how to add a computer running Windows 7 to a domain. Although, in principle, adding computers with other versions of Windows to a domain is not much different - the main thing is to understand the essence.
First of all, we insert network cable to the computer =). Now you need to configure your network connection. Right-click on the computer in the tray and open Network and Sharing Center and shared access.
In the window that appears, click Change adapter settings - all available ones will open network connections. We need to select Connect by local network, right-click on it and select Properties.
In the window that opens, you need to enter data such as IP address, subnet mask, gateway and DNS server. It should turn out something like this.
Click OK, thereby saving the changes. This completes the preparatory part of the work. Now let's move on to adding a computer to the domain.
Click Start, right-click Computer, and select Properties. In the left part of the window, find the item Advanced system settings and left-click on it. In the window that appears, open the Computer name tab.
Click OK. You will be prompted to enter a username and password that has the right to join computers to the domain, for example, a domain administrator. After this, a reboot will be required.
At the end of the reboot, your computer will be in the domain.
If the computer has left the domain
Yes, this happens too. The computer may suddenly refuse to see the domain. Accordingly, authorization will not work.
Then we again enter the computer into the domain as shown above and reboot again.
Tags: windows, domain, computer
myfirstcomp.ru
How to join a Windows 7 PC to a domain
Incorporating a PC into a domain will allow you to enjoy such domain goodies as scalability, centralized management, group policies, security settings and much more.
Before joining your Windows 7 machine to the domain, make sure that the following conditions are met:
You are using windows 7 Professional, Ultimate or Enterprise - these are the only ones windows distributions 7 can be included in the domain. Windows 7 Home is not possible, don’t even try.
You have LAN card(NIC) – a wireless card will do
You are physically connected to the local network from which the domain controller is accessible. Please note that Windows 7 can be added to a domain without network connection with the latter (this feature appeared in the domain on Windows Server 2008 R2), but this is the topic of a separate article.
You have the correct IP address for the network you are connected to. You can configure it manually or get it from a DHCP server.
You “see” the domain controller over the network.
Your DNS server is configured correctly - without correct setting DNS, your computer cannot be entered into the domain.
You have local administrator rights - a simple user will not be able to do this.
You must know the domain name, and have an active user/administrator account on the domain. By default, any domain user can add 10 machines to the domain. But this setting may have been changed by the domain administrator.
There are 3 options for including a machine with 7 in the domain: using GUI(My Computer-> Properties-> Change Settings-> Computer Name tab), using the NETDOM command line utility, using the Power Shell (add-computer) command. I won’t go into detail on the first one; everyone already knows this very well.
Using the NETDOM utility, you can solve the problem of connecting to a domain from the command line. But by default this utility does not work! How to get netdom to work in windows 7?
Open a command prompt window with administrator rights and enter the following line:
Netdom join %computername% /domain:winitpro.ru /userd:DOMAIN\administrator /passwordd:
Note: Replace winitpro.ru with your domain name, and enter the correct username and password. domain with your correct domain name, and of course enter the appropriate user credentials. Also note the extra “d” in the /userd and /passwordd parameters, this is not a typo.
Restart your computer. That's it, you are now in the domain!
Also check out the article: how to prevent leaving a domain, as well as offline function domain join in windows server 2008.
winitpro.ru
/ how to enter a computer into a windows domain
Good afternoon, dear readers of the blog pyatilistnik.org, today I would like to tell you how to add a computer to a windows server 2008 R2 domain. You can read about what a domain is in the article Introduction to the basic concepts of Active Directory. There are several ways to add a computer to the domain active directory.
How to join a computer to a domain
And so there are several methods to enter a computer into a domain, one through the GUI interface, but the second is for command fans, but both have their own application scenarios. Let me remind you that in order to add a computer to AD, you must have user or domain administrator credentials. By default, an ordinary user can add up to 10 computers to AD, but if desired, this can be bypassed by increasing the number, or the necessary rights for the account can be delegated.
1. Via GUI
Go to the properties of My Computer by right-clicking and selecting Properties from the context menu. Or press the Win+Pause Break key combination, which will also open the system properties window.
how to enter a computer into a windows domain
Click Change settings
How to add a computer to a windows 2008 R2 domain
On the Computer name tab, click the Change button
How to add a computer to a windows 2008 R2 domain
We set the computer name with a maximum of 16 characters; it is better to immediately set a name that is clear to you and meets your standards.
How to add a computer to a windows 2008 R2 domain
And write the domain name, click OK
indicate the domain suffix
We enter credentials that have the right to enter the server into the domain; by default, each user can enter up to 10 times into the domain, unless of course you prohibit this.
Enter your credentials
successful addition to domain active directory
Do not forget that as soon as you have entered the server into AD, it also needs to immediately configure a static IP address and only then reboot
After the reboot, we see that everything is fine and we are members of the domain and you managed to enter the PC into the domain.
2. Netdom utility
Open ( command line) cmd. Previously, I described how to open the Windows command line. The convenience of this method is that it can be done in the form of a script and passed it, for example, to remote user, who lacks knowledge of how to do this.
Netdom join %competername% /domain:contoso.com /userd:contosoadmin1 /passwordd:* - %competername% the computer name can be left like this - /domain we write the domain - /userd login - passwordd:* means that you will be prompted to enter a password
I think it was not difficult and you will choose the method that suits you. It’s useful to know both because it’s better to make the server in core mode for maximum security.
3. Through the Offline file and the djoin.exe utility
Let's imagine a situation where on your computer, which you want to enter with an Active Directory domain, there is no connection with the controller, but you need to do this, well, the network engineer has not yet configured a vpn channel between offices, Microsoft has an Offline domain join script for this moment or as it is also commonly called, autonomous entry into the domain. Offline domain join appeared with the advent of Windows 7 and Windows Server 2008 R2. So what does adding a computer to an AD domain look like?
For clarity, there is a main office and a remote branch, they need to be linked together, a separate domain should be deployed, there is no point in a branch, since there are only 3 employees there, and according to company standards they must be part of the Active Directory domain.
Stages of Offline domain join
- At the very beginning, you need any computer that has a connection with a domain controller, on it we will create a special file, it is called a blob (binary large object), by executing the djoin /provision command on the command line, which will create a computer account in the Active Directory database
- The second stage is to transfer this file, via mail or the Internet, and on the client side, which needs to be entered into the domain, execute a command using the received file.
djoin.exe utility parameters
- /PROVISION - prepares a computer account in the domain.
- /DOMAIN - the domain to join.
- /MACHINE - computer joining the domain.
- /MACHINEOU is an optional parameter that specifies the department in which the account is created.
- /DCNAME is an optional parameter that specifies the target domain controller on which the account will be created.
- /REUSE - reuse an existing account (the password will be reset).
- /SAVEFILE - save the preparation data to a file located at the specified path.
- /NOSEARCH - skip detection of account conflicts; DCNAME required (higher performance).
- /DOWNLEVEL - Provides support for a Windows Server 2008 or earlier domain controller.
- /PRINTBLOB - Returns a base64 encoded metadata blob for the response file.
- /DEFPWD - use the default computer account password (not recommended).
- /ROOTCACERTS - optional parameter, enable root certificates of the certification authority.
- /CERTTEMPLATE - optional parameter of the computer certificate template. Includes CA root certificates.
- /POLICYNAMES - optional parameter, a list of policy names separated by semicolons. Each name is the display name of a GPO in AD.
- /POLICYPATHS - optional parameter, a list of paths to policies, separated by semicolons. Each path points to the location of the registry policy file.
- /NETBIOS is an optional parameter, Netbios is the name of the computer joining the domain.
- /PSITE - an optional parameter, a permanent site in which to place the computer joining the domain.
- /DSITE is an optional parameter of the dynamic site in which the computer joining the domain is initially placed.
- /PRIMARYDNS - optional parameter, the primary DNS domain of the computer joining the domain.
- /REQUESTODJ - Requires offline domain joining at next boot.
- /LOADFILE - specified earlier using the /SAVEFILE parameter.
- /WINDOWSPATH - to the directory with the offline windows image.
- /LOCALOS - allows you to specify the local location in the /WINDOWSPATH parameter operating system.
In the test environment we will create a computer called WKS1, and we will add it to the Active Directory domain. WKS1 will be located in the Offline_Join division, our blob file will be called wks1.txt
djoin /provision /domain Contoso.com /machine WKS1 /machineOU "OU=Offline_Join,DC=Contoso,DC=com" /savefile c:\test\wks1.txt
If you suddenly decide that in a blob file you can find useful information, then you are mistaken, it is encrypted and not human readable.
Now we need to transfer these couple of kilobytes to remote computer, where autonomous entry into the domain will take place. Copy the blob to the root of the C:\ drive, open the command line and enter the command
djoin /requestODJ /loadfile c:\test\wks1.txt /windowspath %systemroot% /localos
After executing the command, the computer account metadata from the blob file will be added to the windows directory.
WITH virtual machines djoin works, just as well, it makes no difference, there is a /windowspath key that points to the location of the VHD file with the installed system.
4. add to domain via Powershell
Open Powershell as administrator and enter this command
Add-Computer -DomainName your domain name
Enter the name of your domain, you will see a form for entering your login and password
if everything is ok, then you will see a yellow message indicating that there will be a reboot.
As you can see, there are a lot of methods and everyone can use their own and for their own tasks, I think the question of how to join a computer to the ad domain can be closed.
Material from the site Pyatilistnik.org
pyatilistnik.org
How to add a computer to a domain
Domains greatly facilitate the work of users, allowing you to log in just once and forget about all passwords for various devices and files on a large local network.
To do this you need: 1.administrator rights; 2. local network with a windows domain; 3.user account in the domain;
4.domain name.
1. You can include your computer in the windows domain on the “Computer name” tab in the “System Properties” window. To open the System Properties window in the Windows XP operating system, use the Start menu to open Control Panel and click on System. If your computer has the Windows 7 or Vista operating system installed, open the “Control Panel” and go to the “System and Security” category, in which click on the “System” item. On the page that opens, click on the “Advanced system settings” link located in the left side column. 2. In the “System Properties” window that opens, select the “Computer name” tab. Click the "Change" button and in the window that opens, enter the name of the domain to which you want to include the computer. Next, click on the OK button. In the window that appears, enter your domain username and password. After that, click OK and restart your computer. Your computer is joined to a domain. 3. In addition to the graphical interface, you can join the computer to the domain using the command line. The Windows XP operating system includes the NETDOM utility, which can add a computer to a domain using the command:
netdom join computer_name /domain:domain_name /userd:domain_name\user_name /passwordd:user_pass.
Where computer_name, domain_name and user_name must be respectively replaced with the names of the computer, domain and user being added, and user_pass must be changed to the user’s password in the domain.
In Windows 7, the NETDOM utility was replaced by the PowerShell command – add-computer. To join a computer to a domain from the console in Window 7, run the following command:
add-computer -DomainName domain_name -credential domain_name\user_name
Where domain_name and user_name also replace with domain and user names.
The windows domain is not intended for home use, it is very convenient for corporate networks with a large number of users having different levels access to files and devices. Therefore, computers running operating systems for home use, that is, below the Professional level, do not have tools for joining a domain. To add such computers, first reinstall the system.
There are more quick way launch the "System Properties" window. If you have a Windows XP operating system, right-click on the “My Computer” icon and in the menu that opens, click on “System Properties”. If you have a Windows 7 or Vista operating system, right-click on the “Computer” icon, select “System Properties” and click on “Advanced system settings”.
When you join a computer to a domain, on the same “Computer Name” tab, you can set a description of your computer, which will be a hint for domain users.
complaz.ru
How to enter a computer into a domain using different options?
The question of connecting a computer to a domain usually arises among system administrators who need to create a local network. Domain system means that all computers on the network use the settings of the main PC. Let's try to figure out how to connect a computer with an operating system to a domain windows system 7. For other OS, the connection is not too different.
What are the benefits of a domain structure? With its help you can use, for example, group policies and centralized management. This allows for efficient work.
Important Requirements
Before you enter a Windows 7 computer into the domain, you need to check whether the PC meets a number of requirements and whether all settings have been completed. There are quite a few of them, although most of them should already be produced. Check the following:
- The following versions of Windows 7 must be used: Professional, Ultimate or Enterprise. Only these versions can be joined to a domain;
- A network card must be present. But this goes without saying;
- A local network connection must be made. In most cases, although it is possible to connect Windows 7 to Windows Server 2008 R2 offline, this is a separate topic;
- The correct IP address must be specified. It can be configured manually, obtained from a DHCP server, or it can be an APIPA-address (its values start with 169.254.X.Z);
- You need to make sure that the controllers (at least one) are available for connection;
- Also check the controller connection (for example, you can ping it, that is, check the quality of the connection);
- The DNS server must be configured correctly. This is important; if it is not configured correctly, problems may arise when connecting to the domain. Even if the connection is successful, failures are possible later;
- DNS servers must be available. To do this, you need to check the connection using the PING program;
- View your rights at local system. You must have local computer administrator rights;
- You need to know the domain name, administrator name and password.
Connecting a PC to a domain
There are two ways to add a computer to a domain. Let's look at them in more detail.
First method
This is the standard way to connect a PC to a domain. Follow these steps:
- Click the “Start” icon, right-click on the “Computer” shortcut, select “Properties”;
- In the “Computer name, domain and work settings” item, click “change settings”;
- Open the “Computer name” tab and click “Change”;
- In the "Part of (something)" section, select "Domain";
- Enter the name of the domain to which you are connecting, click “OK”;
- Enter your name and password again.
Then restart your computer. After this, the PC will be connected to the domain on the local network.
Second method
You must use the NETDOM application. To connect a domain, you need to enter just one command on the command line:
Wherein:
- The parameters “DOMAIN.COM” and “DOMAIN” must be replaced with the domain name. You also need to specify your login and password;
- The extra "d" in "user" and "password" is not a typo;
- In Windows 7 NETDOM is already included in the operating system. IN Windows versions 2000, XP and 2003 need to install Support Tools.
To complete the connection, restart your PC.
What to do if the domain has “dropped out”?
This happens after the PC is connected to the domain. The computer simply doesn’t “see” it. You will notice this immediately, because you will not be able to log in. Do the following:
- Log in as a local administrator;
- Go to system properties and in the “Computer name” section, note that the PC is part of a workgroup;
- Restart your computer;
- Then reconnect the PC to the domain as described above;
- Reboot.
The computer should now join the domain.
Placing a computer in a specific container
The disadvantage of the described methods of connecting to a domain is that the PC is placed in a standard container, usually in the “Computer” folder. And to move to another location, an administrator is needed. But you can place the computer immediately in the right container. There are two options for this.
Method number 1
To do this, first create an empty account where the computer is located (you need to have rights to create an object). In the ADUC console, a new account is created with the same name that will be used to connect to the domain. Then use the connection method described above. The system will see an account that already exists in the domain, but is simply not mapped to it. After matching, the computer will fit into the desired container.
Method number 2
You can use the Powershell command:
- Log in with administrator rights;
- In the command line, enter “powershell” (then you can use PoSh instead);
- The command to include a PC in the corp.company.ru domain from under the corpcompany_admin account, creating an account in the corp.company.ru/ Admin /Computers container, where company is the name of the computer, will look like this:
add-computer -DomainName corp.company.ru -credential corp company_admin –OUPath "OU=Computers,OU=Admin,dc=corp,dc=company,DC=ru";
- A new window will open in which enter the company_admin user password;
- Then the window “WARNING: The changes will take effect after you restart the computer pcwin8” (pcwin8 means operating system) will appear. Restart your computer.
Now the PC will be located in the desired container, where the domain refers.
To correctly connect a PC to a domain, it is better for the administrator who created this local network to do it. He knows about all the pitfalls in this domain, and therefore can quickly connect. If you decide to connect your computer to the domain yourself, then in case of any problem, leave the PC in this state until a specialist makes a correction.
Joining a computer to a domain allows you to take advantage of all the benefits of a domain, such as centralized management, group policies, and much, much more.
Prerequisites
Before entering the computer under Windows control 7 into the domain, ensure that the following prerequisites are met:
Using Windows 7 Professional, Ultimate or Enterprise- only these editions of Windows 7 can be connected to a domain.
Do you have a network card- without any comments, I think you haven’t forgotten about it
You are connected to the local network- Make sure you are connected to the local network. Although Windows 7 can be joined to a Windows Server 2008 R2 domain offline, that's a topic for another article.
You have the correct IP address- Make sure once again that you are connected to the network and have the correct IP address. The address can be manually configured, obtained from DHCP servers or the APIPA address (which starts with 169.254.X.Y) can be obtained. If you receive an APIPA address, you are guaranteed to have potential problems, since APIPA and AD do not work together.
Domain controllers are available to you - or at least one of them. You should test connectivity to the domain controller, for example by pinging it, although a successful ping does not guarantee that the domain controller is fully accessible.
You must have a properly configured DNS server- Without a properly configured DNS server, you are guaranteed to have problems when entering the domain, during work, etc.
DNS servers are available to you- Check your connection to DNS servers using the PING program and issue a NSLOOKUP request.
Check your permissions on the local system- To successfully log into the domain, you must have local computer administrator rights.
Know your domain name, admin username and password
There are two ways to join a computer to a domain. In this article we will look at both methods.
Method #1 - Traditional way
1. Open system properties by clicking the Start button, then right-clicking on the "Computer" shortcut, and clicking "Properties".
2. In the "Computer name, domain, and workgroup settings" section, click "Change settings".
3. Go to the Computer Name tab and click "Change".
4. In the Member of section, click Domain.
5. Enter the name of the domain you want to connect to and click OK.
You will be prompted to enter your domain username and password.
After successfully entering the computer into the domain, you will be prompted to reboot. Do this to complete your entry.
Method #2 - Use NETDOM
With NETDOM we can join a computer to a domain from the command line with just one command.
NETDOM in Windows 7 is included in the operating system, unlike Windows 2000/XP/2003 where it was necessary to install Support Tools.
Open a command prompt as administrator:
and enter the following command:
Comment: Replace DOMAIN.COM and DOMAIN with your domain name and naturally indicate your domain username and password. Note also the extra "d" in "user" and "password", this NOT typo.
Netdom join %computername% /domain:DOMAIN.COM /userd:DOMAIN\administrator /passwordd 
@ssw0rd
To complete the procedure, reboot your computer.
If you, like me, always carefully monitor hi-tech news, then I advise you to subscribe to the excellent news site Informua.net. Only the most interesting high technology news and much more.
Today we will look at a rather important topic that any system administrator has encountered or will definitely encounter in the near future. The corporate local network of a medium or large enterprise in 99% of cases has a domain structure. This is dictated, first of all, by the security policy of the enterprise. Thus, all computers on the network use the settings of the main computer - the domain (security can be ensured).
Now I propose to consider an example of how to add a computer running Windows 7 to a domain. Although, in principle, adding computers with other Windows versions not much different - the main thing is to understand the essence.
First of all, insert the network cable into the computer =). Now you need to configure your network connection. Right-click on the computer in the tray and open Network and Sharing Center.
In the window that appears, click Change adapter settings– all available network connections will open. We need to choose Local network connection, right-click on it and select Properties.
In the window that opens, you need to enter data such as IP address, subnet mask, gateway and DNS server. It should turn out something like this.
Click OK, thereby saving the changes. This completes the preparatory part of the work. Now let's move on to adding a computer to the domain.
Click Start, right-click on the item Computer, select Properties. On the left side of the window we find the item Advanced System Settings and click on it with the left mouse button. In the window that appears, open the tab.
Click OK. You will be prompted to enter a username and password that has the right to join computers to the domain, for example, a domain administrator. After this, a reboot will be required.
At the end of the reboot, your computer will be in the domain.
If the computer has left the domain
Yes, this happens too. The computer may suddenly refuse to see the domain. Accordingly, authorization will not work.
Then we again enter the computer into the domain as shown above and reboot again.