The Internet is a collection of local area networks, which are located in all countries of the world. Typically, such a communication line contact with each other, respecting the common rules called protocols. Such conditions are accepted by all parties on a voluntary basis, because there is not a single government regulation, which would force them to use.
DNS – this is one of the most important sets of rules. The name stands for "domain name system". DNS should be seen as a distributed database that contains information about network devices: IP address, information for routing mail, machine name.
The first blast system for BSD Unix appeared 30 years ago. Berkley Internet Name Domain still continues to be part of most Unix systems.
Any computer on the Internet has the status of the client. Also he can simultaneously play the role of a server.
When there is a need to accelerate the process of determining the names comes to the aid of the DNS server. What is it, you ask?
A DNS server – is a computer which converts the symbolic names to IP addresses and Vice versa.
In case if your computer – client network programs use the gethostbyaddr function to determine the name of the machine on her network contacts. Option allows gethostbyname to get the IP address of the device.
If the device is used as a DNS server, then this is evidence of registration at least one domain on the machine.
The DNS server answers the queries bound to it domains and forwards them if necessary to other computers from a foreign zone.
Based on the fact that DNS – the domain name system every computer needs it identified. That is why network devices are assigned their own unique names that consist of letters separated by dots.
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Is the DNS address-is a unique combination of a real machine name, and domain contacts.
The DNS Structure has the form of a tree hierarchy consisting of domains, zones, nodes and other elements, which you now know.
On top of the root zone. It can be configured in various mirrors, which contain data about the servers and are responsible for the DNS domain. This happens on the computers located around the world.
Many servers of the root zone are engaged in the processing of any requests, even non-recursive. We said several times this mysterious word, and that means it's time to explain what is the essence of it.
Area you can call absolutely any part of the tree of the domain name system. It is an integral and indivisible sector of the map. The selection of multiple branches in one area allows you to delegate responsibility for this part of the tree to another organization or person.
Each region must contain a component of the DNS. This allows to locally store data, for which you have to answer.
As for the domain, it is only a branch of the tree structure of DNS, the private node that has more than one device in a command.
The Internet has a huge number of domains, and all of them except the root are subordinate to their higher elements.
Primary DNS server is an authoritative computer. It stores all the file copy of the zone data accompanied by the system administrator.
Secondary DNS server is one of the main computers. It copies all the files stored on the primary server. Its main difference is that the data coming from the master server, not the configuration of zone files. Secondary DNS server may share information with other computers of the same level. Any request to host an authoritative server will be transferred to either him or the master device.
The Number of secondary servers is not limited. There may be any number. Notifications about changes or expansion of the zone come regularly, but it all depends on the settings set by the administrator.
The zone transfer is most often carried out by copying. There are two mechanisms of duplication: full and incremental.
These computers do not have authoritative rights. In his memory they save the answers to the questions that were asked earlier. If information cannot be found, it is necessary to request data from upstream DNS servers.
This is an additional module that is often attached while installing free programs. It is extremely harmful to the productivity and efficiency of the personal computer.
This is a program that can destroy the system or lead her to inaction. It is a virus that spreads like wild-fire around the world. After the first invasion DNS Unlocker starts to operate in the background, that is transparent to users. The module gradually install on the computer malicious codes that cause threats to the system. In additionthis virus, the module automatically disables the antivirus so that nothing could protect the important files and documents, which slowly comes program.
What are the signs that your PC is infected with adware? What is this program you already know. Start learning the signals that indicate that your data is at risk.
It is Therefore very important to identify a malicious module, and as early as possible to remove it. Only such a drastic measure will save your computer from losing important data.
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