Chapter Assessment: Caching and CDNs

This is the chapter review for Caching and CDNs. The bank holds twenty questions and each attempt draws ten, so repeating it gives you different coverage. Caching is the area where a plausible answer is most often wrong, so the distractors are deliberately reasonable. Several questions put two mechanisms side by side where both work on a normal day and only one survives a step that fails to run. Two questions reward working on paper: the in-process lock across twenty instances, and invalidating before a transaction commits. Treat a wrong answer as a pointer to the lesson to reread.