IGMP - Internet Group Management Protocol

IGMP: what is behind the Internet Group Management Protocol

Using multicast connections, data streams can be transferred to a large number of clients easily and in such a way that saves resources – provided that the accessing systems are part of the same multicast group. In IPv4 networks, the organization and management of these groups is based on the Internet Group Management Protocol (IGMP), which was published as early as 1989. What exactly this...

Virtual Machines

An introduction to virtual machines

Virtual machines are extremely practical and versatile: Do you want to set up an isolated test environment, run a Linux application on your Windows computer, or provide different operating systems for cross-platform software tests? With the right virtualization software and an appropriate image file, this is easy. We will introduce you to the basics of hypervisor-supported hardware virtualization...

Unix: a history

Unix: the operating system setting new standards

In the context of open source operating systems, the term “unixoid” is often used, indicating that the software is similar to the Unix system published in 1969. Typical indicators are, for example, the file system, or means and rights available to access the system and its processes. But what exactly is Unix, and who is behind the development of this influential operating system?

What is Internet protocol? – IP definition, etc.

What is Internet Protocol (IP)?

When networking a computer system, protocols play an important role. An example is the Internet Protocol, which was published in a first specification in 1981, and is the indispensable basis for the smooth sending and receiving of data packets. But what is behind the RFC standard? And how does the internet protocol actually work?

Ethernet frame

Ethernet frame: definition and variants of the frame format

Ethernet frames enable the transmission of data over an Ethernet connection and are essential for local area networks. Ethernet frames are structured and sized differently depending on the protocol, and contain important information such as MAC addresses, protocol information, length information, and much more. The established Ethernet standard IEEE 802.3 has also developed special frames for VLAN...

Ethernet

What is Ethernet (IEEE 802.3)?

In the beginning, there was ARPANET and ALOHAnet. Then Ethernet followed as a groundbreaking innovation for local networks. Ethernet enabled collision-free interconnection of multiple devices via a common bus. For the first time, data packages could efficiently be exchanged between individual devices. Today, the technology is extensively used in the standard IEEE 802.3. With fiber optic cables,...

What is CentOS? Versions & system requirements

What is CentOS?

Finding a suitable operating system that meets your own requirements is usually not very difficult in the private sector. Most of the time, it’s just down to personal taste whether you favor Windows, macOS, or Linux. The search for a system solution for enterprise and server environments is far more difficult and complex. When selecting, factors such as long-term support, security, and cost play a...

An Overview of SaaS (Software as a Service)

What is SaaS (software as a service)? An overview

Software as a service, or SaaS for short, is an increasingly popular option for cloud computing. With SaaS, you use software over the Internet instead of installing it on your hard drive. This offers considerable advantages, especially for companies. As with other cloud services, there are also various concerns about data security. What exactly SaaS is, where the advantages and disadvantages of...

Server Name Indication

Server Name Indication (SNI): What’s behind the standard?

What is server name identification, really? Encryption technologies play a big role when it comes to surfing on the net. Credit card data and other personal information must not fall into the hands of criminals. For now, TLS is one of the protocols used for this purpose. But it has a disadvantage: it only functions when each IP address only hosts one domain. If multiple virtual services are...

Arduino vs. Raspberry Pi: Affordable DIY hardware

Arduino vs. Raspberry Pi: a comparison of the microcontroller and single-board computer

DIY projects such as timers, remote controls, robots, and drones are becoming ever more popular. Knowledge of such things as electronics and programming, though, is fading into the background – thanks to ready-to-use, affordable components such as Arduino boards and minicomputers like Raspberry Pi. They allow for novices and amateur hobby craftsmen to obtain their own results quickly without...


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