Question

What is CDN? (10) b) Describe why we need it? (5) c) Also, CDNs typically adopt...

What is CDN? (10) b) Describe why we need it? (5) c) Also, CDNs typically adopt one of two different server placement philosophies. Name and briefly describe them. (5) 15) Assume Ahmed using his user agent

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Answer #1

Answer 1)

CDN is defined as the Content Delivery Network. CDN provides the users with the content they need through the internet, CDN uses distributed servers to minimize delays in loading web content by reducing the distance between the server and the user. For example, multiple copies of a website which user want to access is stored in different server around the globe so that user access the website from the server which is the nearest and thus reducing loading time. In this way different user access web content from the server which is near to their loading. Thus, we need CDN to reduce the loading time.

CDN can adopt one from the two different server placement philosophies are below:

1) Enter Deep

It is developed by Akamai. It is a distributed architecture and the objective of enter deep is to get near to the end-users and thus reducing the loading time. The cost and task of maintenance are high because of the highly distributed design.

2) Bring Home

It is owned by Limelight and other companies. In this CDN every cluster is placed at a location that is near to many ISP. It has lower maintenance and management cost and reduces loading time.

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