Study Notes
The choice of digital communication in a network is influenced by factors such as speed, data transfer volume, and the type of connection. Understanding these factors helps in selecting the most suitable communication method.
- Distance — The further data travels, the slower it moves. Example: Signal strength weakens over long distances, reducing transfer rates.
- Interference — Physical obstacles and other signals can disrupt data transmission. Example: Electrical equipment can cause slowdowns in data transfer.
- Network Traffic — When many users access a network simultaneously, speed is reduced. Example: Available bandwidth is shared, slowing down the network.
- Connection Type — Different technologies offer different maximum speeds. Example: Fibre optic cables provide faster speeds than copper cables.
- File Size — Larger files take longer to transfer. Example: A 1GB video file takes longer to transfer than a 10KB text document.
- Compression — Compressed files reduce data volume for faster transfer. Example: ZIP files transfer faster than uncompressed files.
- Media Type — Different media types contain varying amounts of data. Example: Streaming a film requires more bandwidth than downloading a song.
Exam Tips
Key Definitions to Remember
- Bandwidth: Maximum data transfer capacity in a network.
- Latency: Time delay between sending a request and receiving a response.
Common Confusions
- Confusing bandwidth with speed; bandwidth is capacity, not speed.
- Assuming wireless is always slower than wired; depends on the technology used.
Typical Exam Questions
- What factors affect data transfer speed? Distance and network traffic affect speed by weakening signals and sharing bandwidth.
- Discuss the advantages and disadvantages of wired vs wireless networks. Wired is faster and more secure; wireless offers mobility and easy setup.
- Define bandwidth and latency, and explain their importance in online gaming. Bandwidth is data capacity; latency is delay. Low latency is crucial for gaming.
What Examiners Usually Test
- Understanding of how distance and interference affect network speed.
- Ability to compare wired and wireless network advantages and disadvantages.
- Knowledge of bandwidth and latency impacts on different applications.