gen-define-latency-versus-bandwidth-and-give-one-short-worked-ex-dc8c

Define latency versus bandwidth and give one short worked example.

# Latency vs Bandwidth **Latency** is the *time delay* for data to travel from source to destination (measured in milliseconds, ms). **Bandwidth** is the *amount of data* that can be transferred per unit time (measured in Mbps, Gbps, etc.). ## Analogy Think of a pipe delivering water: - **Latency** = how long it takes the first drop to arrive - **Bandwidth** = how much water flows through per second ## Worked Example You're downloading a 100 MB file with: - Bandwidth: 10 Mbps (megabits per second) - Latency: 50 ms **Time to download:** 1. **Connection setup (latency):** 50 ms to establish connection 2. **Transfer time (bandwidth-limited):** - Convert: 100 MB = 800 Megabits - Time = 800 Mb ÷ 10 Mbps = 80 seconds 3. **Total time:** 50 ms + 80 seconds ≈ **80.05 seconds** **Key insight:** For large files, bandwidth dominates. For small requests (like loading a webpage with many small resources), latency dominates because you pay the delay cost for each round-trip.