The NDC (Network Data Center): China's Internet data centers. Relative to the IDC and the NDC to introduce the wide area network platform and cloud computing, cloud storage technology, integration bandwidth, storage, computing power to divert resources to build intensive carrier-grade service platform, and significantly ease the company's Internet export costs pressure, short-term low-cost content resources greatly enriched within the network, improve the quality of user services, improve customer satisfaction and open up new value-added network services, to promote comprehensive and sustainable development of the company's Internet business.
NDC is based on the network, to provide for centralized collection, storage, processing and sending data equipment operation and maintenance of facilities and service system. NDC to provide the main business includes VPS hosting (seats, racks, VIP engine room rental), rental of resources (such as virtual hosting business, data storage service) (the system configuration, system maintenance, data backup, troubleshooting, service), management services (such as bandwidth management, traffic analysis, load balancing, intrusion detection, and diagnosis of system vulnerabilities), and other support to run the service. NDC concept of a unified standard, but the concept can be understood as the public business of Internet rooms ", but it is also an IT professional services, is the critical infrastructure of the IT industry, the NDC is not only service concept and the concept of a network, which constitutes part of the network infrastructure resources, like the backbone network, access network, provides a high-end data transmission (DataDelivery) services and high-speed access services.

WDC English name Web Data Center, Web-based, centralized collection, storage, processing and sending data equipment operation and maintenance of facilities and service system. WDC provided the main business includes VPS hosting (seats, racks, VIP engine room rental), the resource rent (such as virtual hosting business, data storage service) (the system configuration, system maintenance, data backup, troubleshooting, service), management services (such as bandwidth management, traffic analysis, load balancing, intrusion detection, and diagnosis of system vulnerabilities), and other support to run the service. WDC concept of a unified standard, but the concept can be understood as the public business of Internet rooms ", but it is also an IT professional services, critical infrastructure of the IT industry, the WDC is not only service concept and the concept of a network, which constitutes part of the network infrastructure resources, like the backbone network, access network, provides a high-end data transmission (DataDelivery) services and high-speed access services.

The WDC = web-data center site data center data center of the NDC = network the data center network: as opposed to the tradition of the IDC, the NDC to introduce the wide area network platform and cloud computing, cloud storage technology, integration bandwidth, storage, computing power dispersed resources, build intensive carrier-grade service platform, significantly ease the company's Web export cost pressures, the short term, cost a great rich network of content resources, improve the quality of user services, improve customer satisfaction, value-added services to open up a new network to promote the company comprehensive and sustainable development of the Internet business.

BGP (Border Gateway Protocol) protocol is mainly used for the interconnection between Internet AS (autonomous system), the most important features of BGP is to control the spread of routes and choose the best route. China Netcom and China Telecom have the AS number (autonomous system number), the majority of the major network operators through the BGP protocol and its own AS number to interconnect. Use this program to achieve dual-line CNNIC (China Internet Network Information Center) for IDC's own IP addresses and AS numbers, and then by the BGP protocol to this paragraph IP address broadcast to Netcom, China Telecom and other network operators to use BGP will judge of the protocol Internet, Netcom and Telecom's backbone routing equipment to IDC room IP section of the best route to ensure that high-speed access to Netcom, China Telecom users. This program the following advantages: 1. The server only needs to set an IP address, best access route from the backbone routers on the network routing hops with other technical indicators to determine not take up any system resources of the server. Uplink routing and downstream routing of the server can choose the best path, they are able to truly high-speed single-IP two-lane access. Two. BGP protocol itself has a redundant backup to eliminate the characteristics of the loop, so when multiple BGP interconnection lines IDC service providers can achieve the mutual backup routing, routing will automatically switch to other lines in a line failure. 3. BGP protocol can also make the network a highly scalable IDC network with other operators can interconnect easily single IP multi-line, so that all users of the Internet operators access soon. This is a dual-IP lane can not be compared. BGP program is the best solution, but due to equipment investment and bandwidth of this program needs to IDC provider into the larger and technically more complex, so this program is limited to a stronger professional IDC service providers. In summary, a variety of two-lane to achieve its own way the advantages and disadvantages of dual-IP lane lower cost, but the network is not stable enough and take a lot of server resources, ordinary single IP line just part of the double line effect poor access speed, the CDN on the static pages effect pages effect of the strong interaction is very good but not ideal, the BGP single IP line to solve all the above problems is the best way to achieve the domestic use of such programs IDC service providers less able to BGP single IP lane and CDN to accelerate the combine will be the optimal solution. The country have combined BGP technical solutions data center, but mostly to provide services for special customers, there is little for ordinary users and IDC Business of the engine room.

Ordinary single IP line refers to set an IP on the server, this IP Netcom's IP Telecom IP packet through the routing device is set, the packet is a telecommunications network or the Netcom network issued a two-wire technology . This program can also improve the user's access speed of Netcom users and telecommunications to solve the problem of dual-IP lane need to set the routing on the server, but the IP address is used Netcom and Telecom IP, access to the user sending the request packet does not automatically determine the best route. Therefore, this solution can only be said to be semi-wire technology program, a transitional form of solutions. This program is generally for a temporary solution the singlet IDC service providers to the wire IDC service providers in transition.

The dual-IP line implementation is installed on a server with two network cards, access to telecommunications networks, cable and Netcom network cable and set up a network IP and Telecom IP, so that there are two IP addresses on a single server Netcom or telecommunications routing table on the server to add to Netcom users and telecommunications users access from a different line. Dual-IP lines commonly used in two ways: 1. ICP users set up on the site links to two different IP address, Netcom, the user clicks on Netcom's IP access servers, and telecommunications users click on the Telecom IP access. Two. BIND 9 (DNS server software) to return to a different server IP Netcom, a user requests a domain name back to Netcom's IP telecommunications users request the domain name back to Telecom's IP request to a different IP address, this way some smart IDC DNS programs. Dual-IP line to some extent, improve the speed of the Netcom and Telecom users to access the site, but the drawback is that the access server is dual NIC on the server routing table settings to the general user maintenance difficulty, and all data packets need to make a routing decision on the server and then sent to a different network card, when the visited server resource consumption. This program is the most simple two-wire solution is generally limited to the IDC smaller providers use.

International Data Corporation (IDC) is the world's leading IT, telecommunications, and consumer technology consulting, consultancy and activities, professional services providers. IDC helps IT professionals, business executives and the investment community make technology purchasing decisions based on facts and business development strategy. IDC in the world with over 1000 analysts, they have the professional perspective of globalization, regional, and local, in-depth analysis on more than 110 countries, technology trends and business marketing opportunities. IDC over 48 years of development history, the number of corporate clients with IDC's strategic analysis and to achieve key business objectives successfully. Our customers include Fortune Global 500, a number of famous multinational companies, including well-known in many industries in China's domestic enterprises. IDC IDG, a subsidiary of IDG is the world's leading media publishing, research and consulting, and events company. IDC is a wholly owned subsidiary of International Data Group (IDG) is the world's leading technology publication, exhibition services and research and consulting firm. In 2009, IDG's revenues reached $ 3.05 billion, nearly 13,000 employees worldwide. As a privately held company, IDG was founded in 1964, the company is committed to providing scientific and technical information to provide people with information and analysis resources to help people around the world to improve the quality of life. IDG's founder and chief executive officer, Patrick McGovern's life interest is to study the brain and the brain of human behavior. In 2000, Patrick McGovern, and his wife, Lore Harp - McGovern, presented a gift to the Massachusetts Institute of Technology, that is, to establish the McGovern Brain Institute. Continue to support the spirit of scientific research, they are committed to improving human welfare, communication and understanding.

Often refers to in the automotive sector: the ignition of the diagnostic connector, ignition diagnostic of the connector of the abbreviation. 2, in the field of legal and financial trade often means: the initial direct costs, the abbreviation of the initial the direct costs. 3, in the petrochemical industry often refers to: the instantaneous offset control, Instantaneous Deviation Control abbreviations. 4, often refers to the field of electronic engineering: intelligent disk controller, that is the abbreviation of the Intelligent Disk Controller. 5, Apple enthusiasts often say: idc i do not care abbreviation.

A data center of a room, one or more layers of occupation of a building, or even the entire building. Most of the equipment is often placed in a rack with a 19-inch compartment. These rack rows placed to form a corridor. This allows people to access from the front or rear compartment. 1U server from the server to an independent silo storage devices very different storage devices to occupy a lot of block tiles in size. Some equipment, such as mainframe computers and storage devices often look at their rack so big, and placed them next. Very large data center can use the container to place, each container can be placed on the server 1000 or more; when repair or upgrade needs, the entire container will be replaced rather than maintenance of a single server. Natively compiled code can control the smallest rise limits. The data center's physical environment is strictly controlled: x air conditioning control, data center temperature and humidity. The ASHRAE's data processing environment, heat the guidance of the recommended temperature 20-25 ° C (68-75 ° F) and humidity at 40-55%, with the best conditions for the data center 17 ° C as the maximum dew point. The power will heat the air inside the data center. Unless the heat is removed, otherwise the temperature will continue to rise, resulting in the failure of the power supply. By controlling the air temperature, the server component in the shelf layer maintain the manufacturer's instructions, temperature / humidity range. Air-conditioning system in the space below the dew point back and forth through the cooling air, to help control humidity. Too wet, then, the water began to concentrate on internal components. If dry air, humid auxiliary system will increase water vapor, if the humidity is too low will cause electrostatic discharge problems that will damage the components. Underground data center able to spend less compared to the conventional design, and maintain computer equipment cooling.
× modern data center trying to use to save the device cooling, where they use outside air to ensure that the data center cooling. Washington State now has several data centers, and 11 a year to use outside air to cool the server. They are not using a cooler or air-conditioning, they create the potential to save millions.
× backup power from one or more uninterruptible power supply or diesel.
× in order to prevent the single point of failure, all power system elements, including the backup system, are typical of fully replicated, and the key server to connect two power supplies (the "A-Side" and the "B-Side") area. Such an arrangement is often used to complete the system of N +1 redundancy. Static gates are sometimes used to guarantee instantaneous conversion one to another in the event of power failure.
× a typical data center use increased to 60cm (2 ft) on the ground, moveable side bricks. The trend now is 80-100cm (31.5-39.4in), the increase of the idle region in order to better ensure air circulation. This supply is sufficient circulation of air in the underground as a condition part of the system, but also provide space for the power cable. In modern data centers, data cables typically use overhead cables. However, some for security reasons or to place them on the floor, and there is need to increase the cooling system on the shelf. Smaller / less spent in the data center did not rise to the ground but the use of the opposite static tiles on the ground. Computer cables are often placed in the corridor, to ensure maximum air flow efficiency.
A feature of the x data center fire protection systems, including passive and active design elements, as well as the implementation of the fire prevention program in the business. Smoke detectors are installed, it can be detected before the flame to the stew smoke source point, and alerts. This allows investigation, interruption of power supply, and make before the fire bigger, people use a fire extinguisher. An automatic sprinkler system is often used to control the fire development for a wide range of fire. Automatic sprinkler system requirements for spray fire extinguishers clear 18 "and compared to the sprinkler system, Clear Event extinguishing gas systems are sometimes installed for the early fire. Passive fire protection elements include the firewall in the data center around fire protection system fails or is not installed, so the fire can easily be controlled in a certain range.
× physical security in the data center, performing a role. Physical place to visit often limited to selected personnel, including the safety control system. Video surveillance and permanent security alert is often used for large data centers or data centers contain confidential information.

(1) with respect to the purchase of stand-alone server, site construction costs greatly reduced, as the popularity of small and medium-sized web site provides a great convenience;
Low-cost, online information publishing publicity and functional advantages, but its costs low is unthinkable. Radio and television ads in seconds, but the cost is also hundreds of thousands of; newspapers ads are expensive, than the majority of units of personal endurance. Online information to save newspapers print and radio and television stations expensive production costs, the cost is greatly reduced, so the vast majority of individual units to be able to withstand. Cover a wide range of traditional media, regardless of TV, newspapers, radio or light box posters across geographical constraints, only the impact on specific areas. Turnover probability is high for traditional media advertising, the audience is mostly passive acceptance, difficult to produce the effect. The form of lively, the use of multimedia technology, various forms of online information, maps, text, sound, such as the shape of the product, use, use, price, purchase method of information displayed directly in front of the user. With real-time, businesses can change the advertising content at any time according to market needs, flexible and convenient. More importantly, corporate and institutional users, which is currently the most money, convenient and practical way.
(2) the use of virtual mainframe technology can be a real host is divided into many "virtual" host, each virtual host has a separate domain name and IP address with a complete Internet server functions. Completely independent of the virtual host, exactly the same as the outside, each virtual host and a separate host. The same effect, but the cost is not the same. Multiple virtual hosts to share the resources of a real host, each virtual host the user to bear the cost of hardware and network maintenance costs, the cost of communication lines are significantly reduced, the Internet has truly become affordable for everyone to network. At present, many companies create a site using this method, so that not only saves the cost of the purchase of machinery and leased line, server management server, such as software configuration, anti-virus, anti-attack and other security measures by the professional services provided by greatly simplifies the complexity of server management; also do not have to worry about the technical problems for the use and maintenance of the server, without hiring a dedicated management staff.
(3) site construction efficiency improved, to buy their own server to install the operating system and application software require a longer time, renting a virtual host usually only takes a few minutes can be opened, because the major service providers have the entire business The process of e-commerce, select the virtual host that suits your needs, online payments immediately after the opened.
(4) the emergence of the virtual host, is a significant contribution to the development of Internet technology and network, multiple virtual hosts to share a real host of resources, has greatly increased the utilization of servers and communications lines, making a single server can There is no conflict to configure multiple network IP address, which means that people are able to use virtual hosts to build a number of sites with separate domain names on a single server, no longer have to build a site to purchase a separate server and use the giant application for funding green as the export of network information. Now, the majority of domestic and foreign enterprises establishment this server hard disk space leased (virtual host), the benefits of the virtual host is not only significant savings in the cost of buying a server and leased line, but also do not have to use and maintain the server the technical issues to worry about, other do not have to have a dedicated server management.
(5) low cost and high utilization of the virtual host data center virtual host, quickly attracted a small and medium enterprises. In order to meet the increasingly fierce international competitive business environment after China's entry into the WTO, to speed up the application of investment, income, online trading platform, to enhance the intensity of e-commerce, corporate Internet and other information construction, web hosting Jianzhan improve enterprise competitiveness an important means of force.