Shulou(Shulou.com)05/31 Report--

This article mainly explains "how to understand the functional features of NTP server". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to understand the functional features of NTP server".

The way the NTP server runs

The use of NTP server includes fixed connection and dynamic connection. In a fixed connection, the client only receives the specified server-side connection, and it will not change the server-side reception time regardless of whether the server is connected normally or not. The general client / server mode is this mode. In addition, it has been a dynamic connection, and the client is constantly receiving broadcast information from the server. When a server is out of service, as long as there is correct and reliable time information broadcast by the server, the client can update the time normally. Generally speaking, it is a broadcast connection.

The client-server method is the most widely used method on the Internet. After setting the server, it can configure the client flexibly and let the client choose whether to use the NTP server or use that NTP server. The client-server mode uses the commonly used RPC mode to transmit time information. The process they run is that the client sends a time request to the server, and then adjusts the time according to the server's reply.

In general, the client can define the interval of their synchronization time, and the maximum and minimum time interval they request. The client will compare its own clock time with the NTP server time. If the client's local clock is more accurate, the time interval of their query will be longer. If the local time error is larger, the client will make a time request in a relatively short time to ensure the accuracy of the client time.

Ntp is a protocol for synchronizing computer clocks on network computers. It uses adjusted Greenwich mean time (UTC) to synchronize the computer time to milliseconds. Of course, in order to prevent malicious attacks on the time server, the ntp protocol uses an identification mechanism to check whether the timing information really comes from the claimed server and to check the return path of the information, as well as to provide a protection mechanism against interference.

Under basic conditions, the NTP client sends out a time request and exchanges time with the time server. Typically, there are six exchanges every 5 to 10 minutes during the initial phase of the setup; once synchronized, synchronize with the server time every ten minutes, usually requiring a single exchange of information.

NTP server working mode

Ntp working mode: active / passive symmetrical mode: one-to-one links, both sides can synchronize each other or be synchronized by the other. The first party who applies to establish a connection is in active mode, and the other party is working in passive mode, which is suitable for configuring redundant time servers.

Client / server mode: basically the same as the active / passive mode, the only difference is that the client can be synchronized by the server, but the server cannot be synchronized by the client.

Broadcast mode: is an one-to-many link service, no matter what mode the customer works in, the server actively sends out time information, and the customer receives the time update information, they will actively adjust their own time, but the network has a certain delay. The precision is used with a certain loss, but it can meet the second-level application. The broadcast mode is simple to configure, but its precision is not high.

Generally speaking, the model of ntp server with high performance-to-price ratio in the market is recommended to use SYN2136 Beidou NTP network time server.

This time server adopts modern high-tech hard disk-free design, is not limited by regional climate and other environmental conditions, cost-effective, simple operation, maintenance-free and other characteristics, suitable for unattended. This product can provide precision standard time signal and time stamp service for computer network, computer application system, process control management system, e-commerce system, online B2B system, database preservation and maintenance, hard disk video recorder and other intelligent devices.

Thank you for your reading, the above is the content of "how to understand the functional features of NTP server". After the study of this article, I believe you have a deeper understanding of how to understand the functional characteristics of NTP server. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.