What kind of virtual currency is CND
abbr. Campaign for nuclear disarmament
[example] that & # 39; Judith Croft, the CND woman.
The full name of CDN is content delivery network. The concept of CDN began in 1996, and was put forward by a research group of Massachusetts Institute of technology to improve the quality of Internet service
in order to publish rich broadband media content on the traditional IP network, they proposed to build a content distribution platform based on the existing Internet to provide services for the website. Because CDN is the optimized network coverage layer to speed up the network access speed, it is vividly called "network accelerator"
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CDN standard formulation
with the rapid development of China's CDN network construction and instry, the telecommunication service classification catalog (2015 Edition) was published in December 2015, which clearly put forward that CDN service should be included in the first category of value-added telecommunication service. However, the unification of CDN technical standards is still a long way to go for the whole instry
as a professional and leading CDN service provider in China, Netshop technology has participated in the development of CDN standards, including business processes, functional architecture, application scenarios and requirements. In addition, NCS also participated in the development of CDN security standards, CDN security protection testing and other related standards
with years of technology accumulation, Netshop successfully launched the first certificateless HTTP acceleration scheme in China as early as 2015, which can realize the deployment of CDN services for HTTP sites without providing private keys to third-party CDN server nodes, thus eliminating the risk of private key leakage in the process of transmission and deployment
At present, the solution has been widely used in financial instry, e-commerce and government enterprises, including Ping An Securities. In total, Wangsu independently led the establishment of five CDNs, jointly led one, and participated in seven CDN instry standardsin the future, Wangsu technology will continue to be committed to the formulation of relevant standards, continue to guide the development of the instry with a professional and positive attitude, and achieve a high degree of unity of proct value and social value
The full name of CDN is content delivery network. The basic principle of CDN is to widely use a variety of cache servers, and distribute these cache servers to the areas or networks where users visit relatively intensively. When users visit the website, the global load technology is used to direct the user's access to the nearest normal cache server, and the cache server directly responds to the user's request
throughout the value chain of broadband services, content providers and users are located at the two ends of the whole value chain, and they are connected by network service providers. With the maturity of Internet instry and the change of business model, the role in this value chain is more and more subdivided. Its purpose is to enable users to obtain the required content nearby, solve the situation of Internet congestion, and improve the response speed of users to visit the website
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the current CDN services are mainly used in securities, finance and insurance, ISP, ICP, online trading, portal, large and medium-sized companies, online teaching and other fields. In addition, it can be used in instry private network and Internet, and can even optimize the LAN network
with CDN, these websites do not need to invest expensive servers and set up sub sites, especially the wide application of streaming media information, distance teaching courseware and other media information that consume a lot of bandwidth resources. By using CDN network, the content can be copied to the most edge of the network, so that the distance between the content request point and the delivery point can be minimized, so as to improve the performance of the web site, It is of great significance
CDN can cover almost all domestic lines. In terms of reliability, CDN achieves multi-point rendancy in structure. Even if a node fails unexpectedly, access to the website can be automatically directed to other healthy nodes for response. CDN can easily realize the nationwide deployment of websites without considering the investment and hosting of servers, the cost of new bandwidth, the mirror synchronization of multiple servers, and more management and maintenance technicians
CDN is short for content delivery network, which means content distribution network
CDN License refers to the business license issued to enterprises engaged in content distribution network business, which is the business license for enterprises to carry out value-added telecom business B12. Business number B12 is the abbreviation of content distribution network business license, commonly known as CDN license, CDN qualification
CDN license can be divided into national CDN business license and provincial CDN business license according to the geographical scope of business. One can carry out content distribution network business across regions, and the approval department is the Ministry of instry and information technology; the other can only carry out content distribution network business in the province, and the approval department is the General Administration Bureau
The validity period of CDN license is 5 years. If the license is e for 5 years, you need to renew it, and apply 90 days in advanceCAD (Computer Aided Design) refers to the use of computers and their graphic equipment to help designers in their design work. In the design, a lot of calculation, analysis and comparison of different schemes are usually carried out by computer to determine the optimal scheme; All kinds of design information, whether digital, text or graphic, can be stored in the computer memory or external memory, and can be retrieved quickly; Designers usually start with sketches, and the heavy work of turning sketches into working drawings can be done by computers; The result of design automatically proced by computer can quickly make graphics, so that designers can judge and modify the design in time; The computer can be used to process the graphic data related to the editing, zooming in, zooming out, translating, plicating and rotating of the graphics.