Q25 — AWS SOA-C02 Ch.1

Question 25 of 100 | ← Chapter 1

A SysOps administrator notices that the cache hit ratio for an Amazon CloudFront distribution is less than 10%. The SysOps administrator needs to increase the cache hit ratio for the distribution, improve network performance, and reduce the load on the origin. Which combination of actions should the SysOps administrator take to meet these requirements? (Choose two.)

• A. Enable CloudFront Origin Shield for the required AWS Regions. ✓
• B. Change the viewer protocol policy to use HTTPS only.
• C. Add a second origin. Create an origin group that includes both origins. Activate CloudFront origin failover.
• D. Turn on automatic compression of objects in the cache behavior settings.
• E. Increase the CloudFront TTL values in the cache behavior settings. ✓

Correct Answer: A. Enable CloudFront Origin Shield for the required AWS Regions., E. Increase the CloudFront TTL values in the cache behavior settings.

Explanation

Amazon CloudFront的低缓存命中率通常与缓存策略和请求回源频率相关。启用Origin Shield（A）允许在区域级别聚合请求，减少对源的直接访问，提升边缘缓存效率。增加TTL值（E）延长对象在边缘节点的缓存时间，减少重复回源。选项B涉及协议安全策略，与缓存效率无直接关联。选项C的故障转移机制主要用于高可用性，不影响缓存行为。选项D的自动压缩主要优化传输数据大小，而非缓存存储时长。根据AWS最佳实践，优化缓存行为和减少回源是提升命中率的关键手段。