DNS server is what? DNS Unlocker - what is it?

The Internet is a collection of local computer networks, which 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 yet a single governmental normative act that would force them to use them.

What is DNS?

DNS is one of the most important sets of rules. The name stands for "domain name system". DNS should be treated as a distributed database, which contains information about network devices: IP address, information for routing mail messages, the name of the machine.

The very first domain system for BSD-Unix appeared 30 years ago. Berkley Internet Name Domain still continues to be a part of most Unix-systems.

DNS server - what is it?

Any computer on the Internet has the status of a client. It can also act as a server in parallel.

When there is a need to speed up the process of identifying names, a DNS server comes to the rescue. What is it, you ask?

A DNS server is a computer that converts character names to IP addresses, and vice versa.

In the case of a client computer, network programs use the gethostbyaddr function to determine the machine name from 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 of the domains bound to it and forwards them, if necessary, to other computers from a foreign zone.

DNS addresses on the Internet

Based on the fact that DNS is a domain name system, each computer needs to be identified in it. This is why network devices are assigned their own unique names, which consist of letters separated by dots.

That is, the DNS address is a unique combination consisting of the name of the real computer and the contact data of the domains.

Basic concepts of Domain Name System

The DNS structure is a tree-like hierarchy consisting of domains, zones, nodes, and other elements that you will now recognize.

At the top is the root zone. It can be configured on various mirrors that contain data about the servers and are responsible for the DNS domain. This happens on computers located around the world.

Numerous servers in the root zone are handling any queries, even non-recursive ones. We have repeated this mysterious word more than once, which means it's time to explain what is its essence.

The zone can be called absolutely any part of the tree-like system of domain names. This is an integral and indivisible sector on the map. The allocation of several branches to 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 the DNS service. This allows you to locally store data for which you have to answer.

As for the domain, it is just a branch of the DNS tree structure, a private node that has more than one device in its subordination.

On the Internet there is a huge number of domains, and all of them, except the root, obey the higher elements.

DNS Servers

The main DNS server is an authoritative computer. It stores all copies of the zone data file, accompanied by the system administrator.

A 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's configuration files. A secondary DNS server can share information with other computers of the same level. Any query on the hosts of an authoritative server will be transferred either to him or to the host device.

The number of secondary servers is not limited. There can be as many as you like. Alerts for changing or expanding the zone are received regularly, but everything depends on the settings set by the administrator.

The transfer of the zone is most often done by copying. There are two mechanisms for duplicating information: complete and incremental.

Caching DNS Server

Such computers do not have authoritative rights. In their memory, they save answers to questions that were asked earlier. If the information can not be found, you have to query the data from the upstream DNS server.

DNS Unlocker - what is this program?

This is an additional module, which is often attached when installing free programs. It extremely hurts the performance and efficiency of the personal computer.

This is a program that can destroy the system or lead it to inactivity. It is a virus that spreads all over the world at lightning speed. After the first invasion of the DNS system, Unlocker starts to act in the background, that is, unnoticed by users. The module gradually installs malicious and dangerous codes on the computer, which lead to the emergence of threats to the system. In addition, the virus module automatically disables the anti-virus so that nothing can protect important files and documents to which the program is slowly selected.

How to determine if your computer is infected with a malicious program

What are the signs that your PC is infected with DNS Unlocker? What kind of program is it, you already know. Let's start studying the signals that indicate that your data is under threat.

• The emergence of unknown windows. If you start pop-up ads when working with your computer, take the problem seriously. This is one of the signs that your system infected the virus module.
• The decline in PC performance. Recently, your PC has started very slowly to perform standard actions, which took seconds before? Check the performance of the machine. If this indicator has rapidly fallen, then it's time to check the system and delete DNS Unlocker.
• Emergency operation of the system. If recently your computer started to hang very often, it can also talk about the presence of the virus module.
• Redirect to another web page. DNS Unlocker is a virus module that can change the settings of browsers. This is manifested in redirecting to other resources. Also, the look of the home page and the default search engine can change.
• New icons. On your desktop, you may see unknown shortcuts that contain links to malicious and dangerous websites.
• Hardware disputes. This case is characterized by shutting down the printer and other devices without your immediate intervention. You can choose one setting, and the computer will react to your commands quite differently or not at all respond to them. Such a situation can also talk about the contamination of the system.
• Lack of important files. While working with applications, your system can report a critical error - the lack of important data. It is likely that this is due to the work of the virus module. Once embedded in the system, it is able to climb into its settings and delete important files, without which the correct operation of applications becomes impossible.

Dangerous impact of DNS Unlocker on the Windows operating system

• A malicious add-on can change the browser settings that are familiar to you. It's about the search engine that is used by default, the home page, all sorts of redirects to dangerous third-party resources.
• Opening the browser, instead of the last tabs you will see an unknown web page.
• Various pop-ups and informational messages will interfere with the workflow. A move through the links from them - this is an additional threat to your computer.
• The label "My computer" is replaced by another icon with reference to an extraneous malicious resource.
• Once introduced into the system, the virus makes it vulnerable by placing dummy system utilities and toolbars.
• The browser's search engine starts to produce unreliable results, and this will do much harm, especially if it's about finding official information.
• DNS Unlocker changes the standard OS settings, and disables the task manager.
• Applications start to work very slowly and only respond to user requests from time to time.
• Like most viruses, DNS Unlocker will get to your confidential data: name, passwords. Also the program will reveal all your photos and personal files.
• Some users argue that a malicious module is able to block access to the desktop and require a fee for its opening.
• It is quite logical that DNS Unlocker blocks antiviruses, because he wants as much time as possible to remain unnoticed and spread 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.