Bandwidth vs Throughput
Bandwidth is capacity; throughput is actual achieved data rate.
Updated: 2026-03-05
Definition
Bandwidth describes the theoretical maximum capacity of a link.
Throughput is the real-world data rate after overhead, congestion, and losses.
Key points
- Throughput is always <= bandwidth
- Overhead and losses reduce throughput
- Measure to troubleshoot performance
Common mistakes
- Assuming higher bandwidth always fixes performance (latency/loss may be the issue).
- Ignoring duplex mismatches or retransmissions.
Related exams
CompTIA Network+ (N10-009)
Free Network+ N10-009 mini test. Continue in the app for offline packs and detailed explanations.
Cisco CCNA (200-301)
Free CCNA 200-301 mini test. Continue in the app for offline packs and detailed explanations.
CompTIA A+ (220-1201 / 220-1202)
Free CompTIA A+ mini test. Continue in the app for offline packs and detailed explanations.
Related terms
Want to practice this in exam-style questions?
Use the mini tests on each exam page, then continue in the app for offline packs and detailed explanations.
Go to exams