Which technique reduces the amount of data transmitted over a network by keeping a copy of recently seen data in memory?

Which technique reduces the amount of data transmitted over a network by keeping a copy of recently seen data in memory?

• A. Latency
• B. Compression
• C. Caching
• D. Bandwidth

Answer: (C)

Caching reduces the amount of data transmitted over a network by keeping a copy of recently seen data in memory. When the same data is requested again, it can be served from the cache instead of being fetched over the network, which cuts down on data that needs to travel across the link and often speeds up access. This approach is widely used in browsers (HTTP caching), applications, and content delivery networks. Latency is about the delay in delivering a response, not the amount of data moved. Compression lowers the size of a single transmission but doesn’t store repeated data for quick reuse. Bandwidth describes the network’s capacity, not a mechanism for reusing data.

Caching reduces the amount of data transmitted over a network by keeping a copy of recently seen data in memory. When the same data is requested again, it can be served from the cache instead of being fetched over the network, which cuts down on data that needs to travel across the link and often speeds up access. This approach is widely used in browsers (HTTP caching), applications, and content delivery networks. Latency is about the delay in delivering a response, not the amount of data moved. Compression lowers the size of a single transmission but doesn’t store repeated data for quick reuse. Bandwidth describes the network’s capacity, not a mechanism for reusing data.