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System Architecture and Reliability

Which describes a CDN (content delivery network)?

  1. AA mechanism that gathers all users' requests to a single server to keep the delivered content consistent
  2. BA mechanism that encrypts communication to create a virtual private line between distant sites
  3. CA mechanism that places copies (caches) of content on many servers located near users and directs users to a nearby server for delivery
Show answer and explanation

Answer: C. A mechanism that places copies (caches) of content on many servers located near users and directs users to a nearby server for delivery

A CDN keeps copies of content such as images, videos and software update files on delivery servers placed in many locations, and directs users to a nearby server for delivery. Because the distance to users is shorter, responses are faster, and the load and traffic on the original server (origin server) are reduced. When access temporarily surges, the load can also be spread across the servers in many locations. Encrypting communication to create a virtual private line between sites is a VPN.

  • A. Gathering everything in one place slows responses to distant users and concentrates the load. A CDN does the opposite and spreads it out.
  • B. This describes a VPN (virtual private network).
  • C. Correct. Delivering from a nearby server speeds up responses and reduces the load on the origin server.
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