The Internet is a collection of local computer networks that are located in all countries of the world. As a rule, such communication lines are in contact with each other, observing uniform rules called protocols. Such conditions are accepted by all parties on a voluntary basis, because there is not a single governmental normative act that would force them to be used.
What is a DNS?
DNS is one of the most important rule sets. The name stands for "domain name system". DNS should be perceived as a distributed database that contains information about network devices: IP address, information for routing mail messages, machine name.
The very first domain system for BSD-Unix appeared 30 years ago. Berkley's Internet Name Domain still continues to be part of most Unix systems.
DNS server - what is it?
Any computer on the Internet has the status of a client. It can also play the role of a server in parallel.
When there is a need to speed up the process of determining names, a DNS server comes to the rescue. What is it, you ask?
A DNS server is a computer on which character names are converted to IP addresses, and vice versa.
If the computer is a client, network programs use the gethostbyaddr function to determine the name of the machine by its network contact information. The gethostbyname option allows you to find the IP address of the device.
If the device is used as a DNS server, then this indicates the registration of at least one domain on the machine.
The DNS server responds to requests from domains bound to it and forwards them, if necessary, to other computers from a foreign zone.
Internet DNS addresses
Based on the fact that DNS is a domain name system, each computer needs to be identified in it. That is why network devices are assigned their own unique names, which consist of letters separated by dots.
That is, a DNS address is a unique combination of the name of a real computer and domain contact information.
Domain Name System Concepts
The DNS structure looks like a tree hierarchy consisting of domains, zones, nodes and other elements that you will now learn about.
At the top is the root zone. It can be configured on various mirrors that contain server information and are responsible for the DNS domain. This happens on computers hosted around the world.
Numerous root zone servers handle any request, even non-recursive ones. We have repeatedly repeated this mysterious word, which means that the time has come to explain what its essence is.
A zone can be called absolutely any part of the tree-like domain name system. This is an integral and indivisible sector on the map. The allocation of several branches in one zone allows you to delegate responsibility for this part of the tree to another organization or person.
Each area necessarily contains a component such as DNS. This allows you to locally store data for which you have to answer.
As for the domain, this is just a branch of the DNS tree structure, a private node that has more than one device in the subordination.
There are a huge number of domains on the Internet, and all of them, except the root, are subordinate to the parent elements.
DNS servers
The primary DNS server is an authoritative computer. It stores all copies of the zone data file, followed by the system administrator.
The secondary DNS server is one of the main computers. It copies all files stored on the primary server. Its main difference is that the data comes from the main server, and not from the zone configuration files. The secondary DNS server can share information with other computers of the same level. Any request to the hosts of an authoritative server will be transmitted either to it or to the host device.
The number of secondary servers is not limited. There can be any number of them. Notifications about changing or expanding a zone are received regularly, but it all depends on the settings set by the administrator.
Zone transfer is most often done through copying. There are two mechanisms for duplicating information: full and incremental.
DNS caching server
Such computers do not have authoritative rights. In their memory, they save the answers to questions that were asked earlier. If the information cannot be found, you have to request data from a higher DNS server.
DNS Unlocker - what is this program?
This is an add-on module that is often included when installing freeware. It is extremely harmful to the performance and efficiency of a personal computer.
This is a program that can destroy the system or lead to inaction. This is a virus that spreads all over the world with lightning speed. After the first intrusion into the DNS system, Unlocker begins to operate in the background, that is , it is invisible to users. The module gradually installs malicious and dangerous codes on the computer that lead to system threats. In addition, the virus module automatically disables the antivirus so that nothing can protect important files and documents that the program is slowly picking up to.
How to determine if your computer is infected with malware
What are the signs that your PC is infected with DNS Unlocker? What kind of program is this, you already know. We’ll start by examining signals that indicate that your data is at risk.
- The appearance of unknown windows. If pop-up ads begin to appear while using your computer, take the issue seriously. This is one of the signs that a virus module has infected your system.
- PC performance decline. Recently, your PC began to very slowly perform standard actions, which previously took seconds? Check machine performance. If this figure plummets, then it's time to check the system and remove DNS Unlocker.
- Emergency system operation. If recently your computer has started to freeze very often, this may also indicate the presence of a virus module.
- Redirect to another web page. DNS Unlocker is a virus module that can change browser settings. This manifests itself in redirecting to other resources. The appearance of the home page and the default search engine may also change.
- New badges. Unknown shortcuts may appear on your desktop containing links to malicious and dangerous websites.
- Hardware disputes. This case is characterized by turning off the printer and other devices without your direct intervention. You can choose some settings, and the computer will respond to your commands in a completely different way or not respond to them at all. This situation may also indicate a system infection.
- Lack of important files. While working with applications, your system may report a critical error - the absence of important data. It is likely that this is a consequence of the viral module. Once embedded in the system, it is able to get into its settings and delete important files, without which the correct operation of applications becomes impossible.
Dangerous Impact of DNS Unlocker on a Windows Operating System
- A malicious add-on may change your browser settings. It's about the search engine, which is used by default, the home page, all kinds of redirects to dangerous third-party resources.
- Having opened the browser, instead of the last tabs, you will see an unfamiliar web page.
- Various pop-ups and informational messages will interfere with the workflow. And clicking on the links from them is an additional threat to your computer.
- The “My Computer” label is replaced by another icon with a link to an extraneous malicious resource.
- Once introduced into the system, the virus makes it vulnerable by placing shell system utilities and toolbars.
- The browser search engine begins to produce false results, and this will greatly harm, especially when it comes to finding official information.
- DNS Unlocker changes the default OS settings and also disables the task manager.
- Applications begin to work very slowly and only periodically respond to user requests.
- Like most viruses, DNS Unlocker will get to your sensitive data: name, passwords. Also, the program will open all your photos and personal files.
- Some users claim that the malicious module can block access to the desktop and require a fee for opening it.
- It is logical that DNS Unlocker blocks antiviruses, because he wants as much time as possible to go unnoticed and distribute dangerous code.
Therefore, it is very important to identify the malicious module and remove it as soon as possible. Only such a radical measure will save your computer from losing important data.