Everyone reading this blog is aware of the fact that Internet traffic continues to grow, and that an increasing amount of this traffic is being driven by video. Cisco VNI projects Internet traffic to grow 5 times between 2009 and 2013, and video will constitute 90% of overall traffic. As a result of all this video traffic, one of the biggest buzz words being used lately by telcos as well as vendors selling CDN platforms for use inside a carrier network is the term transparent caching. There's a lot of folks using the phrase these days and as a result, a lot of confusion exists as to what it is, how it differs from regular caching and the role it plays in the CDN industry.
Content caching technology utilized for network optimization has been available for many years, and today, there are a couple of different types of caching approaches being used. Originally caching technology focused on basic web pages and moving HTML files and web objects closer to a user to improve response time. Basic web caching became less necessary as network operators grew bandwidth capacity throughout the last decade and today, most people are familiar with caching to provide application acceleration and scale for CDN's like Akamai. There is also service specific content caching to address particular services, such as Google cache.
What may (or may not) come as a surprise to some readers is the impact that all this traffic has on service provider networks. While CDNs make their money from content publishers who typically pay based on volume, network service providers' money comes from their subscribers who pay a fixed amount per month. So while CDNs (theoretically at least) stand to gain from this increase in video traffic, network service providers are stuck between the proverbial rock and hard place. They have to invest in their networks to scale to support this traffic, yet they are receiving little incremental revenue from it. Clearly, investment with no return is not a sustainable model, and service providers recognize this.
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