FAQ

CDN nodes are typically deployed in multiple locations, often via multiple backbone networks. The number of nodes and servers that make up a CDN varies by architecture, with some reaching thousands of nodes, tens of thousands of servers on many remote points of presence (PoPs), and others building global networks with a handful of Geographical PoPs. A CDN is built on a network of interconnected servers that are strategically placed together to minimize the distance between the user and the nearest server. These servers cache copies of web content. When a user requests a web page, dynamic request routing ensures it reaches the closest available CDN server. If the CDN server has an up-to-date copy of the requested content in its cache, it will respond to the request directly. If not, the CDN server will forward the request to the origin server, which will fill the request. CDN servers can…

A Content Delivery Network (CDN) is a globally distributed network of servers or Points of Presence (PoP) whose purpose is to provide faster content delivery, content is replicated and stored throughout the CDN so users can access storage geographically away from the user The nearest location data. This differs from the traditional approach of storing content on only one central server, where clients access a copy of the data near the client, rather than all clients accessing the same central server to avoid bottlenecks near that server. What is a Content Delivery Network? What is a Content Delivery Network used for? CDNs are designed to optimize the delivery of web content, and some of the key advantages they offer companies and their users include: Faster load times: Content cached by a CDN is geographically close to its users, reducing the travel distance required for requests and responses. As a result,…

CDN is a network topology used to distribute content. Before we can fully understand it, we need to understand the other two terms. 1. Node Before users use a CDN network, CDN providers will deploy multiple nodes nationwide/globally. The nodes here can be considered as computer rooms or server clusters, and are professionally referred to as PoP (Point of Presence) or Origin Server. Each node is used to serve users around it, and because of its proximity, its response time is short. In addition, the node is a cluster composed of many servers, so it can withstand huge traffic. 2. Source Server The source server is the server where you deploy your website, which provides initial content for the entire CDN network. Without using CDN, every request from a user will reach your source server. The farther the distance between the user and the source server, the more packets are…

1、 Background Introduction （1） Characteristics of live streaming service Internet video live streaming is a form of news media that provides content that is produced and consumed from time to time. Over the years, it has developed into various business forms such as showbiz, games, e-commerce, and sports. The main characteristics are: real-time consumption of content generated in real time, with higher requirements for timeliness; Streaming media content consumes a large amount of bandwidth and requires more stringent network quality requirements; One person produces, multiple people consume, and the bandwidth scale is large. Live streaming CDN is currently the most effective technical approach to address this large-scale distribution scenario. Its main characteristics are to access nearby to provide a good access network environment, and multi-layer aggregation to reduce the distribution pressure on central resources, so as to meet the requirements of large-scale and timeliness of live streaming services. （2） Difficulties…

The CDN node cache adopts a three-level architecture of memory, solid-state hard disk, and hard disk. Through an independently developed intelligent cache migration algorithm, files can be dynamically migrated based on the popularity of files accessed by end users, always reserving valuable memory space for a large number of users. “Useful” video content to obtain high-performance output. After applying CDN, DNS returns not only IP addresses, but also CNAME, pointing to the global load balancing of CDN. Let’s take a look at the indicators that measure CDN service quality? 1. Hit rate The resource accessed by the user happens to be in the cache system and can be returned directly to the user. The ratio of hits to visits indicates that the hit rate of commercial CDNs has now exceeded the current standard level, which is equivalent to amplifying the service capacity of the source site. Since no IP address…

Now is the Internet era, and the application of the network has penetrated into everyone’s daily life. People can quickly access various shopping, video websites, and game applications through computers or smartphones. To access a website or application, it is necessary to download the packet content from the IP address of the target server to the local device. However, in daily life, people only enter a domain name in the browser or open the APP application during the online process, and no IP address is entered during the process. Why is this? In fact, there is a name in the middle that silently provides services but is not well known to everyone. It is the domain name resolution system, also known as the DNS resolution system, which completes the entire scheduling process of converting domain names into corresponding server IP addresses for query requests. The DNS resolution system plays a…

In total station acceleration, intelligent scheduling is one of the important technologies for achieving CDN network acceleration. The purpose of this technology is to gather users in the same network environment into the same service group, and allocate the optimal service node based on the network and capacity of the CDN server. Simply put, the whole station accelerated intelligent scheduling is to provide users with the most suitable CDN node to access and obtain network services nearby. There are generally two methods of intelligent scheduling: DNS scheduling and central scheduling. DNS Scheduling Mainly based on Local DNS, it is used for scheduling across regions and operators, with high scalability and good performance. It is generally used in full-site acceleration scenarios such as web pages; This scheduling method relies on DNS recursive resolution, passing CNAME to the GLSB of the CDN, and then allocating adaptive nodes based on the geographical location…

The goal of URL statization is to be more friendly to search engines and users. Although Google has previously published a blog post on its official blog that allows it to capture dynamic pages well, and also strongly encourages websites to adopt the form of dynamic pages to build websites, what we need to do is not only to face Google, but also to enable other search engines to capture them well, while making users feel better, Therefore, it is still recommended to adopt the form of static web pages for website building, while in fact, static web pages are relatively easy to achieve good rankings. To understand this issue, we must first understand several basic concepts; 1、 What is the URL? URL is a unified resource locator, a concise representation of the location and access method of resources that can be obtained from the Internet. It is the address…

CDN selects the optimal node to provide accelerated services to end users through scheduling, which is particularly important. In practical applications, four types of scheduling are commonly used, namely, DNS scheduling, HttpDNS, Edge 302 scheduling, and Center 302 scheduling. The following is a detailed introduction to the four scheduling types: 1. DNS Scheduling Intelligent computing, providing services to netizens at the nearest best node. 2. HttpDNS Scheduling The client directly invokes the HttpDNS interface to obtain the cache server IP group, and then selectively sends requests to the cache servers in the IP group, replacing the conventional DNS scheduling policy. This is applicable to the client, and the client needs to modify slightly to make the HttpDNS interface call. 3. Edge 302 Scheduling For resolution errors caused by user LocalDNS configuration errors, the cache server can determine based on the terminal IP and respond to the terminal’s optimal cache server…

1、 What is Refresh? Refresh refers to eliminating old files on a cdn node and retrieving a new version of the file. 2、 What is preheat? The first published file is actively pushed from the source site to the CDN, allowing users to access the CDN without having to hit the customer’s source site. 3、 Why refresh? The resources cached on the CDN node have not expired, but based on the customer’s business requirements, the cache resources on the CDN node need to be updated. When encountering this scenario, the refresh function is launched, which forcibly deletes the cached content of the CDN node. When a user requests these resources, the CDN node needs to pull resources back to the source to ensure that the responding resources are consistent with the source station. Common scenarios: For example, after the game package of Company A is released, it is found that…