Network

Unidentified network
How to solve the “Unidentified network” error in Windows
  • Configuration

If you receive the error message “Unidentified network” in Windows, it usually means that you have no internet access. The causes can be diverse and range from incorrect network configurations or an incorrectly assigned IP address to network driver or router problems. We’ll present you with 6 possible solutions.

How to solve the “Unidentified network” error in Windows
SQL introduction with examples
How to learn SQL with examples
  • Configuration

If you work in web development or routinely analyze data, you’re probably familiar with SQL. It might be a surprise to hear that the domain-specific, declarative language is most-closely related to the design language CSS. Built on the mathematical theory of “relational algebra”, SQL brings some special features to the table. We’ll show you how the language works using examples.

How to learn SQL with examples
The OSI model: a reference for standards and protocols
What’s the OSI model?
  • Know-how

Those working with network technology are bound to encounter the ISO-OSI model sooner or later. This system subdivides communication between computer systems into seven different layers. Each of these layers is assigned a certain task. With the help of this layer model, subareas of abstract processes are able to be descriptively explained.

What’s the OSI model?
Raspberry Pi projects
25 Raspberry Pi projects that show the possibilities of the mini computer
  • Know-how

Raspberry Pi is an inexpensive micro-computer that can behave like a standard computer in many respects. The innovative mini device can be used for a wide range of tasks - from setting up an operating system to surfing the web, to using it as a server or a media center. Discover these interesting Raspberry Pi projects to try out at home.

25 Raspberry Pi projects that show the possibilities of the mini computer
Banana Pi: useful applications and ideas for projects
10 Banana Pi projects that make the most of this mini-computer
  • Know-how

The Banana Pi isn’t big, but the single-board computer can be successfully used for a variety of applications. For example, this versatile competitor of Raspberry Pi can be used as a cloud, VPN or file server as well as a smart home controller or a router. We will show you ten Banana Pi projects which demonstrate the remarkable potential of the compact miniature computer.

10 Banana Pi projects that make the most of this mini-computer
SYN flood
SYN flood attack: variants and countermeasures
  • Security

The attack pattern of a SYN flood attack has been known since the early years of the World Wide Web. Over time, new attack variants and appropriate protective measures have arisen. DDoS attacks with massive data flows originating from botnets are currently the norm. Learn how SYN flood attacks work. We will explain the concepts of these attacks and countermeasures.

SYN flood attack: variants and countermeasures
HTTP Flood Attacks
What is an HTTP flood attack?
  • Security

DDoS attacks are occurring more and more frequently. Among the most insidious are HTTP flood attacks. Disguised as regular users on the website, thousands of complex requests are sent to the server until a system failure occurs. Here you will learn what exactly an HTTP flood attack is, how you can identify them, and how you can protect yourself from them.

What is an HTTP flood attack?
UDP flood
UDP flood
  • Security

UDP flood attacks have been used in the past for denial-of-service attacks. Even servers for major organizations have collapsed under the massive amounts of data. We’ll explain how a UDP flood attack works and provide you with an overview of its technical background, proven security measures, and how it is different from other DoS attacks.

UDP flood
Localhost
Localhost (127.0.0.1)
  • Know-how

What do you need a localhost for? Sometimes it can be useful to communicate with yourself. This is known as a loopback in network technology: instead of feeding a request to the network – e.g. the internet – you instead keep it within your system, subsequently stimulating a network connection. We will explain how the connection to 127.0.0.1 works, and what you can use localhost for.

Localhost (127.0.0.1)
PostgreSQL Could not connect to server Error
PostgreSQL “Could not connect to server” Error: How to troubleshoot
  • Know-how

One of the most common errors that occur when using PostgreSQL is the “Could not connect to server” error that results in a refused connection. Usually, the error can be fixed by taking just a few simple steps. In this article, we will show you how to fix a PostgreSQL that cannot connect to the server in Linux. Read on for more.

PostgreSQL “Could not connect to server” Error: How to troubleshoot