What is a zero client?

The zero client is a particularly streamlined form of the thin client. Its functionality depends entirely on the presence of a server. It has no local storage resources and its operating system is limited to essential functions. Zero clients are often used in virtual desktop environments.

Definition, functionality, and technical realization

What is a zero client?

When searching for a suitable client, you may come across term zero client. But what is a zero client and how does it work? There is no universal definition that all manufacturers, providers, and professionals in different application areas agree on. Zero clients are also known as ultra-thin clients.

Zero clients refer to a compact client-end PC. A common defining feature is that they are a particularly slimmed-down version of a thin client. Their function is limited to specific applications. All other features are defined by the manufacturer. In most cases, zero clients can only be used for a specific visualization solution, which is determined by the respective provider.

Technical realization of zero clients

The zero client is the exact opposite of the fat client, which has a full operating system and can be used independently and autonomously. Zero clients generally have no hardware resources of their own, for example, disk drives and local memory resources. They are completely dependent on the availability of a server.

Physically speaking, zero clients look like a small box, which peripheral devices, like a keyboard and mouse, can be connected to. Depending on the design of the hardware, one or more monitors can also be connected. In addition, the zero client has an interface that communicates with the server that it depends on. This interface can be implemented with a cable or wirelessly.

The client-server model forms the architecture for the interaction between server and client. In many cases, the zero client is a single-chip board. This chip is the network controller and provides the processor function and graphics function. When switched on, it uses firmware, where the remote protocol is anchored, to connect to the server.

Advantages of the zero client

Zero clients are a popular choice, especially in large enterprises. Companies use them for a variety of reasons and advantages.

The top argument for zero clients is the simplicity of their system administration. Dependency on the server eliminates the need for local management of software and client updates. This also reduces maintenance costs. And it makes securing the system against cyberattacks more efficient. Instead of securing individual clients locally, cybersecurity is managed centrally through a remote server.

In addition to their low purchase cost, the operation of zero clients is also rather economical. Their low energy consumption means they also work efficiently with the chosen server solution. Startup times are fast and efficient. The susceptibility to errors is also low. Due to the zero client’s limited system functions, operating errors are unlikely as users are restricted to their specific tasks. These features result in high system reliability.

Due to the lack of extensive hardware resources, noise is also kept to a minimum. This is a great advantage when, for example, several clients are in the same office.

Disadvantages of zero clients

One of the biggest disadvantages of using zero clients is the loss of flexibility. Relying so heavily on a server brings its own set of consequences with it. Server dependency means that clients are not only affected by local failures, but also by network problems or server failures. In addition, while zero clients are considered cost efficient, you’ll need to allocate more of your budget to server costs since this type of client uses significantly more server resources.

What are the application areas of a zero client?

As we mentioned earlier, zero clients are particularly suited for companies. Companies benefit from the advantages of efficient administration and low purchase costs. Zero clients are designed to access virtualized desktop solutions. Virtualization replaces classic PCs, offering companies a sensible alternative.

What’s the difference between a zero client and thin client?

A zero client, also called an ultra-thin client, refers to a highly streamlined form of a thin client. It’s difficult to draw a clear line between a zero client and a thin client. Nevertheless, there are some significant differences and similarities of note.