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Authors:
James F. Kurose, Keith W. Ross
Chapter:
Multimedia Networking
Exercise:
Review
Question:9 | ISBN:9780132856201 | Edition: 6

Question

CDNs typically adopt one of two different server placement philosophies. Name and briefly describe these two philosophies.

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Answer

The two different server placements philosophies that are adopt by CDNs are shown below.

  1. Enter Deep
  2. Bring home

1. Enter deep:

  • it is pioneered by Akamai. It deploys server clusters in access ISPs (ISPs direct accessing end users) all over the world.
  • The goal of Enter deep is to get close to end users, thereby improving user-perceived delay and throughput by decreasing the number of links.
  • Routers between the end user and then CDN cluster from which it receives content. Because of this highly distributed design, the task of maintaining and managing the clusters become challenging.

2. Bring home:

  • It can be taken by Limelight and other CDN companies; it brings the ISPs home by building large clusters at a smaller number of key locations and connecting these clusters using a private high-speed network.
  • Instead of getting inside the access ISPs, these CDNs typically place each cluster at a location that is simultaneously near the point of presence of many tier-1 ISPs.
  • Compared with the enter-deep design, the bring-home design typically results in lower maintenance and management overhead, possibly at the expense of higher delay and lower throughout to end users.

 

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