Which pair of words best completes the sentence: Higher level protocols use lower levels without needing to understand precisely how they work?

Which pair of words best completes the sentence: Higher level protocols use lower levels without needing to understand precisely how they work?

• A. Higher Lower
• B. Lower Higher
• C. Higher Higher
• D. Lower Lower

Answer: (A)

This is about layering and abstraction in computing: higher-level protocols rely on lower-level layers to provide services, but they don’t need to know how those lower layers work internally. That relationship fits with "Higher" followed by "Lower"—higher-level protocols use the capabilities of lower-level ones through defined interfaces, without understanding their inner workings. The other options would flip the relationship or mix levels (lower using higher, or both being the same), which doesn’t describe how layered architectures operate.

This is about layering and abstraction in computing: higher-level protocols rely on lower-level layers to provide services, but they don’t need to know how those lower layers work internally. That relationship fits with "Higher" followed by "Lower"—higher-level protocols use the capabilities of lower-level ones through defined interfaces, without understanding their inner workings. The other options would flip the relationship or mix levels (lower using higher, or both being the same), which doesn’t describe how layered architectures operate.