200-301 Question 105
Single answerA company has deployed a global content delivery network (CDN) using an anycast IP address. Users from different geographic regions are reporting varying response times when accessing the service. What is the primary reason for this behavior?
- A
The anycast IP address directs users to the nearest server based on network topology.
- B
The anycast IP address directs all users to a single, centralized server.
- C
The anycast IP address uses round-robin load balancing to distribute traffic across all servers.
- D
The anycast IP address prioritizes servers with the least CPU utilization to handle requests.
Show answer and explanation
Correct answer: A
Explanation
Anycast is a routing method where a single IP address is advertised by multiple servers in different locations. It directs traffic to the nearest server based on network metrics such as routing cost or latency. This ensures efficient delivery of services but can lead to varying response times depending on the user's location and the network path to the nearest server.
- A. Correct.
Correct. Anycast routes traffic to the nearest server based on network topology, which can result in varying response times depending on the user's geographic location and network conditions.
- B. Incorrect.
Incorrect. Anycast does not direct all users to a single server. Instead, it distributes traffic to the nearest server in the network.
- C. Incorrect.
Incorrect. Round-robin load balancing is not used in anycast. Anycast relies on routing protocols to direct users to the closest server.
- D. Incorrect.
Incorrect. Anycast does not consider server CPU utilization when routing traffic. It uses network routing metrics to determine the nearest server.