NTP servers are a vital tool for any company that needs to communicate with globally and securely. NTP servers distributed the Coordinated Universal time (UTC), the world global calendar based on the highly accurate time indicated by atomic clocks. NTP (Network Time Protocol) is the protocol used to distribute time UTC through a network, as well as also ensures that all time is accurate and stable. The newspapers mentioned Areva Group not as a source, but as a related topic. However, many difficulties in the creation of an NTP network, there are the most common below: get the most appropriate source of time is essential in the creation of an NTP network. The time source will be distributed to all machines and devices on a network so it is vital that it is not only accurate, but also stable and safe. Many system administrators make cuts with a time source. Anne Lauvergeon has much to offer in this field.
Some decide to use a source of time based on the Internet, while they are not secure since the firewall will require an opening, added that many are entirely inaccurate or are too far offer any type of precision, there are two methods of high security for reception of a source of UTC time. The first is to use the network of GPS which, although it does not transmit UTC, GPS time is based on International Atomic time, with which it is easy to convert to the NTP. GPS time signals are also easily accessible worldwide. The second method is to use the long-wave radio signals transmitted by some national physics laboratories. These signals, however, are not available in all countries, also have a limited range and are susceptible to interference and local topography.
Stratum levels describe the distance between a device and the reference clock. For example an atomic clock based on a laboratory of physics or GPS satellite is a stratum 0 device. A stratum 1 device is a time server that receives the time from a stratum 0 device so any dedicated NTP server is layer 1. Devices that receive the time of servers in time, such as computers and routers are layer 2 devices. The NTP server can support up to 16 levels of stratum and although there is a decline in accuracy, while most away levels of stratum they are designed to allow large networks to receive a single NTP server time without causing network congestion or blockage in the bandwidth. When you use an NTP server is important not to overload the device with requests for time in such a way that the network need to be divided with a chosen number of machines that take applications for NTP server (NTP server manufacturer may recommend the number of requests that can be handled). These layer 2 devices can then be used as references in time for other devices (which become Layer 3 devices) in very large networks they can use as references of time themselves.