thinQmaster Virtual testing partner Adaptive practice exams that find your weak spots and drill them. Every answer explained. From $69
Enroll

thinQmaster

Find your exam

Five questions free, before you decide.

Step 1 · choose a vendor

In one of our camps? Your practice exams come with the tuition — they are on your study page already.

Cloud Computing · Advanced

CloudFront Origin Access Control (OAC)

CloudFront feature that restricts access to an S3 origin so content is served only through the distribution.

Definition

OAC signs CloudFront requests to S3 with SigV4 and works with a bucket policy that allows only the specific distribution, supporting SSE-KMS encrypted objects and all regions. It replaces the legacy origin access identity (OAI).

Example

A bucket policy allows s3:GetObject only when aws:SourceArn equals the distribution's ARN, so direct S3 URLs are denied.

Exam tip

OAC is the current answer for private S3 origins behind CloudFront; OAI is legacy.

Related terms