OCI Traffic Management Service: Steering Policies

C.

Based on the information given, we can conclude that the OCI Traffic Management service is being used to distribute DNS traffic based on subnet addresses. This means that the service is using IP-based steering policies to direct traffic to the appropriate endpoints.

The four steering policies offered by OCI Traffic Management are:

A. Load Balancing Policy - This policy distributes traffic across multiple endpoints using a load balancing algorithm, such as round-robin or least connections. This policy is typically used when there are multiple identical endpoints available to handle traffic.

B. Geolocation Steering Policy - This policy directs traffic based on the geographic location of the requester. This is useful when there are regional data centers or services that need to handle traffic specific to a certain location.

C. ASN Steering Policy - This policy directs traffic based on the Autonomous System Number (ASN) of the requester. This is useful when there are specific networks or ISPs that need to handle traffic differently.

D. IP Prefix Steering Policy - This policy directs traffic based on the IP prefix of the requester. This is useful when there are specific subnets or IP ranges that need to be directed to certain endpoints.

Given that the question states that the traffic is being directed based on subnet addresses, it is most likely that the IP Prefix Steering Policy is being used in this particular case. This policy is designed to handle traffic based on IP prefixes or subnet addresses, which fits with the information given in the question.

Therefore, the correct answer is D - IP Prefix Steering Policy.