Module 02 · Section 1.3.1
Network Performance
INTRODUCTION
Network performance determines how efficiently data is transmitted. J277 requires you to understand two primary factors: Bandwidth and the Number of Connected Devices. Use the interactive controls on this page to see the effects in real time.
STEP 1 · BANDWIDTH
Bandwidth is the maximum amount of data that can be transmitted in a given time, measured in bits per second (bps, Mbps, Gbps). Think of it as the width of a pipe — a wider pipe moves more water. A wider bandwidth allows more data to flow simultaneously.
STEP 2 · SHARED BANDWIDTH
Use the slider below to add users. When more users share the network, the available bandwidth is divided between them, resulting in slower transmission speeds for everyone. Watch the speedometer and packet flow on the right respond.
STEP 3 · OTHER FACTORS
Additional factors that reduce network performance include:
- Interference — wireless signals weakened by walls and obstacles.
- Distance — signal strength degrades over long cable runs.
- Network congestion — too many simultaneous data requests.
STEP 4 · EXAMINER WARNINGS
THE BANDWIDTH VAGUENESS TRAP
When explaining why more users slow a network, simply writing "it is slower" is Too Vague (TV) and will score zero. You must explicitly state that the available bandwidth is divided/split between the users.
WIRELESS PERFORMANCE TRAP
Saying wireless is "slower" scores zero. State it has lower bandwidth and is subject to interference from obstacles/walls, or has increased latency.
Step 0 of 4
0%25%50%75%100%
100%
Throughput
1
Users
12ms
Latency
100 Mbps
Each User
Data Flow
Bandwidth: 100% available · 1 user