For a site to be well analyzed by Google, it must also be well structured and easy to find. To do this, it is first necessary that the pages of the site are unique, functional, pleasant to see and responsive . A well structured site El Salvador Email List should also at least contain a home page, an offer page, a contact page, an “about” page and other useful pages, without overdoing it. Finally, a structured site is a site with content respecting languages ​​understandable by Google. Consequently, an article published on the web must use html languages, respect the use of different tags and properly optimize the image, PDF or video content.

Indeed, in the physical world, when you look for contact details, you go to a directory. In the virtual world, it is your computer which – once connected to the Internet – performs a similar process. In order for two computers to be able to exchange on an IP network, a protocol must assign them an IP address . However, since humans remember names better than numbers, computer scientists have devised a system to ensure conversion. This computer program is precisely the DNS . Without it, all Internet users would have to remember the IP address of all the sites they want to connect to. A convoluted process to say the least.

There is no single DNS server which

It is actually a part of the DNS namespace, which is managed by a specific organization. As part of a tree hierarchy, it includes several DNS subdomains. This then mediates between the applicants for domain names and the Internet Corporation for Assigned Names and Numbers . Better known by the acronym of ICANN , this company assigns IP addresses to all sites on the web. It is therefore easy to understand that DNS is an essential cog in the functioning of the Internet. A true giant directory, the DNS is furthermore subdivided into smaller directories called “domains”. They can be very large and are also subdivided into smaller directories.

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Thus, centralizes all directories, since this would be technically impractical. Instead, there are a large number of DNS servers designed to store all of the DNS records on the web. If the latter needs a record, it can query other DNS servers by sending a request. If necessary, the DNS server issues an upstream request, until it goes back to the domain authority. The authoritative server is the one where administrators set server names and IP addresses. It is in this “master DNS server” that an administrator can change the name of a server or an IP address. In addition, there are also “slave” DNS servers that hold copies of the DNS records.

Anyone inside the firewall is able

As indicated, the function of the DNS is to allow Internet users to access websites. Conversely, to be accessible on the public Internet, any server must have a DNS record and an IP address. These public DNS servers are accessible to everyone and do not require any authentication from Internet users. Even though public DNS is a big part of the web, there are also private DNS. Thus, DNS zones occupy internal DNS servers that store the names and IP addresses of several important elements. These can be file servers, mail servers, domain controllers, or application servers. However, even access to internal DNS servers does not require an authentication procedure.

As a result  In reality, the only thing preventing you from doing this is that you cannot connect to it directly. Basically, public DNS assigns a public server a DNS record and an IP address. Private DNS, on the other hand, allows computers on an internal network to access a network invisible to other users. If the IP address is not in the cache, DNS consults a discursive DNS server (from the associated DNS zone). The recursive DNS server has its own cache. If the latter has an IP address, it sends it immediately. If the IP address is not found, TLD name servers can send the DNS query in the correct direction.

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