Malware and botnets such as ZeroAccess, Conficker and Storm need to be able to propagate and communicate. However, the fact that most organizations do not filter DNS queries means that it can be used as a covert communication channel. Data leaving a compromised system can be encoded in the DNS query and instructions can be sent back to the malware in the DNS responses without raising suspicions. This article gives an overview of this threat and describes some ways of protecting your network from it. DNS is a highly distributed system, i. These authoritative DNS servers only store data for their own domains and traversal of a number of authoritative DNS servers may be required to find a particular DNS record.
When an administrator is thinking about adding disaster recovery capabilities to an application, they need to think through and plan the networking infrastructure so that the application is accessible by users after failover with minimal downtime. This post explains how to setup the required networking infrastructure with the help of an example. We will start with describing the application and then we will look how to setup networking on-premises and on Azure and then concluding with how to do a test failover and a planned failover. In the above diagram, we have an organization called Contoso which has an active directory setup. SQL Server is authenticated using Windows authentication and all virtual machines are joined to domain contoso. On-premises Network The on-premises infrastructure for contoso. All the virtual machines in the application use Static IP, therefore a static IP pool is also defined for the logical network.
How DNS works
Norderstedt, April 07, - Casio announces the release of the Casiotone CT-S1: A digital keyboard with a minimalist design that closes the gap between keyboard and digital piano. Casio is passionate about bringing the joys of music-making to as many people as possible. The new CT-S1 is designed for users of all ages interested in incorporating music-making into their daily lives. With its minimalist design consisting of clean lines, keyboard, built-in speakers and a limited selection of buttons, the instrument fits seamlessly into any lifestyle. Thanks to its compactness, the CT-S1 is suitable for playing at home and on the go - anytime, anywhere. At the same time, Casio AiX Sound Source and a newly developed audio design ensure high sound quality and rich sound. With the help of the Chordana Play app, the tempo or key of the songs being played can be changed for this purpose. With the note-view and the piano roll display, advanced players are able to expand their repertoire and beginners are perfectly supported in their first steps. Along with the CT-S1, Casio is also announcing the release of two other new Casiotone models: the CT-S, featuring a compact design and a variety of sounds, rhythms and functions to offer the casual enjoyment of music to users regardless of their age or skill level. The LK-S, on the other hand, impresses with its illuminated key system guiding the user through the songs.
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