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9618 · 2.1

Networks including the internet — practice questions

Practice and worked examples for 9618 Networks including the internet. Short previews only — attempt the full question in MarkScheme against the official scheme.

Worked example 1

A school with 500 computers needs a network for students to save their work to a central location and access shared software. Which network model, Client-Server or Peer-to-Peer, would be more suitable? Justify your choice with two reasons.

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The Client-Server model would be more suitable.

Justification 1: Centralised Management & Security. In a school environment, it's essential to manage user access and secure student data. A server allows an administrator to set permissions, ensuring students can only access their own work. It also provides a single point for implementing security policies and antivirus software.

Justification 2: Centralised Backup & Resource Sharing. Storing all student work on a central server makes it easy to perform regular, reliable backups. If a student's computer fails, their work is not lost. Furthermore, shared software can be installed on the server and deployed to clients, which is far more efficient than installing it on 500 individual machines.

Worked example 2

A video file is 240 Megabytes (MB). Calculate the theoretical minimum time it would take to transfer this file over a network connection with a bandwidth of 80 Megabits per second (Mbps).

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  1. Understand the units: The file size is in Megabytes (MB) and the speed is in Megabits per second (Mbps). We need to use the same unit. The key is that 1 Byte = 8 bits.
  2. Convert file size to Megabits (Mb): Size in Mb = Size in MB ×\times 8 Size in Mb = 240×8=1920240 \times 8 = 1920 Mb
  3. Calculate the transfer time: Time (seconds) = Total Size (Mb) / Speed (Mbps) Time = 1920 Mb/80 Mbps1920 \text{ Mb} / 80 \text{ Mbps}
  4. Final Answer: Time = 24 seconds.

Mark Scheme:

  • [1] Correct conversion from Bytes to bits (multiplying by 8).
  • [1] Correct calculation and final answer.