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What is a Client Access License (CAL)?
A Client Access License (CAL) is a type of license that grants access to a server for individual users or devices. This license is generally required in certain network environments to ensure compliance with software usage agreements. CALs are commonly used in Microsoft server environments, such as those running Windows Server, Exchange Server, or SharePoint Server.
Why is a CAL necessary?
When you install a server operating system or server software such as Microsoft Exchange, you are typically allowed to have a limited number of simultaneous connections from devices or users. This limitation is to ensure fair and authorized access to the server’s resources. CALs are required to add more connections beyond the limited number allowed by default. In other words, if you want additional users or devices to access the server, you need to obtain CALs.
How do CALs work?
CALs work on a per-user or per-device basis. A per-user CAL allows a specific individual to access the server from any device they use. On the other hand, a per-device CAL allows a specific device, regardless of who uses it, to access the server. It is important to note that CALs are not limited to a single server. They can be used across multiple servers within the same organization, as long as they are in the same licensing program.
Types of CALs
In Microsoft server environments, there are two main types of CALs: Device CALs and User CALs.
1. Device CALs: A Device CAL is assigned to a specific device, such as a computer or mobile device. The device is then authorized to access the server, and any user using that device can access the server’s resources.
2. User CALs: A User CAL is assigned to a specific user, regardless of the devices they use. This means that a user with a User CAL can access the server’s resources from any device they use.
It’s important to consider the specific needs of your organization when choosing between Device CALs and User CALs. If your organization has multiple users sharing the same device, Device CALs may be more cost-effective. Alternatively, if your employees use multiple devices to access the server, User CALs might be more practical.
Summary
In summary, a Client Access License (CAL) is a license that grants access to a server for individual users or devices. CALs are important in ensuring compliance with software usage agreements and are commonly used in Microsoft server environments. CALs can be either Device CALs or User CALs, depending on whether they are assigned to specific devices or users. Understanding CALs is crucial for organizations using Microsoft server software to manage user access effectively.
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