Content delivery network (CDN) is the pillar of Internet, in charge of content delivery. Every one of us interacts with CDN on a daily basis such as while watching YouTube videos online, shopping online, reading articles on websites or surfing on social media for the news feeds. No matter what you see on your PC or mobile browser, there’s always CDN which is running in the background. Before going in depth about the topic first, you need to understand why CDN’s are so widely used these days and importance of the same while forming a network. The main reason behind this is the latency time. The latency time is the delay that occurs from the moment you request to load a web page to the moment its content actually appears onscreen. This delay interval is affected by several factors that you must consider while dealing with actual CDN. The delay interval is the actual difference between the physical distance between you and the website’s hosting server. The primary motto of CDN is to shorten that physical distance and improve website rendering speed and performance.
HOW It Works?
CDN stores a cached version of its content in multiple geographical locations (points of presence, or PoP’s). Every single PoP includes a number of caching servers which are important for content delivery to visitors within its proximity. CDN spreads all your content in multiple or many places all at once, providing superior coverage to all your users. For e.g. when someone in the UK accesses your Indian hosted website, it is done through a local UK PoP. This is how CDN works. From the below image you will come to know the exact working of CDN.
WHO USES A CDN?
Nowadays, almost everyone uses a CDN and those numbers are growing rapidly with every passing year. If you’re running an online business then it is not mandatory to use CDN all the time when so many offer their services free of charge. In spite of free service, CDN’s aren’t for everyone. If you’re running a localized website and the majority of your customers are located in the same region as you’re hosting then CDN will only pass little benefit. For e.g. in the mentioned scenario, CDN will actually down your website’s performance by establishing an unnecessary connection from the actual visitor and an already nearby server.
CDN usage a popular choice in the below sectors as:
- Media and Entertainment
- Online gaming
- Higher education
Benefits of CDN are as follows:
- Improve page load speed
- Handle high traffic loads
- Block spammers, scrapers and other bad bots
- Localize coverage without the cost
- Reduce bandwidth consumption
- Load balance between multiple servers
- Protect your websites from DDoS attacks
- Secure your application
The CDN building blocks are as follows:
- Caching Server’s
- SSD / HDD + RAM
In an ideal world, a CDN would be an internal part of any website hosting. CDN’s were first established in 1990’s and they were too expensive and only accessible to the largest organizations. Today, things have changed and many web hosting service providers do offer CDN services as a add-on. Content delivery networks employ reverse proxy technology. In general, CDN’s are deployed in front of your backend servers. Content Delivery Network primarily improves your hosting by minimizing latency time, reducing bandwidth consumption and providing scalability needed to handle abnormal traffic loads.
The four pillars of CDN design are as follows:
The primary motto of CDN is to reduce the latency. The PoP’s are located at major networking intersections where data travels. Also, CDN’s significantly reduce round-trip times and improves bandwidth utilization.
CDN infrastructure commits 99.9% service level agreements and also ensures record resilience and high availability. In case of the disaster, CDN providers deal with multiple carriers and rely on dedicated out of band management channels.
CDN’s offer DDoS protection services which have much higher scalability requirements. They’re majorly built for high-speed and high-volume routing and easily handle any amount of traffic.
Responsiveness is the amount of time it takes for network-wide configuration changes to take effect.
Depends on the service providers or many CDN providers develop different approaches to their CDN architectures. The two well-known models of CDN topologies are scattered and consolidated CDN.
Scattered CDN Topology:
Scattered CDN elaborates the practice of using more than one provider in order to further improve latency and uptime across the globe. If you’re running a video streaming company or social platform then it is advisable to use a scattered CDN topology or strategy.
Advantages of scattered topology are as follows:
- Scattered CDN providers perform differently in different geographical regions.
- You don’t need to switch scattered CDN providers as this process becomes automated.
Disadvantages of scattered topology are as follows:
- Maintenance cost is more.
- Complicated to deploy new configurations.
Consolidated CDN Topology:
Consolidated CDN topology uses centralized infrastructure that enables agile management and rapid configuration deployments. For the modern approach consolidated CDN is made possible by the evolution of Internet connectivity. The consolidated topology has proven to be less effective in low-connectivity regions.
Advantages of consolidated CDN topology are as follows:
- High-capacity is beneficial for DDoS protection.
- Enables quick configuration deployment
- Less maintenance cost
Disadvantages of consolidated CDN topology are as follows:
- High-capacity PoP’s harder to deploy.
CDN reduces high bandwidth consumption and handles the high traffic load. It improves the accessibility of your content across the globe and website ranking. To protect all your data from the internet attacks, network malfunction or junction faults CDN is beneficial. CDN keeps your entire data safe on all the servers.
So, from the SEO perspective and to drive more traffic to your website go for the best web hosting company with CDN from MilesWeb and avail the maximum benefit from it. The leading web hosting company offers various features and services as shared hosting, VPS hosting, reseller hosting, dedicated hosting, WordPress hosting, etc. at an affordable price point.