7. Videos

A short revision video from the MrBrownCS series.

Watch and think:

• What is the largest number 8 bits can hold?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Convert 0110 0101 to denary.

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• What happens when a carry goes past the 8th bit?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Why is two’s complement preferred for calculations?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• List three embedded systems in your home.
• Why are embedded systems usually cheap and low power?

Open on YouTube ↗

A one-minute film of connected devices triggering each other: an IoT starter.

Watch and think:

• List three embedded or IoT devices in the film.
• What could go wrong if one was hacked?

Open on YouTube ↗

A security researcher shows how cars, pacemakers and phones, all embedded computers, can be attacked.

Watch and think:

• Why are embedded devices often less secure than PCs?
• Which device in the talk surprised you most, and why?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Why doesn’t doubling the cores always double the speed?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Why is ROM needed when the computer starts?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Which storage would you choose for a laptop, and why?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• What does the ALU do?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Which bus carries data in both directions?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• What does the program counter hold?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Name three jobs an operating system does.

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Give two utilities and the problem each solves.

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• When must you use lossless compression?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• What factors reduce network performance?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Why is Ethernet usually faster and more reliable than Wi-Fi?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Name the four TCP/IP layers in order.

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• How is a parity bit like a CRC, and how is it weaker?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Which protocol would you use to upload a website securely?

Open on YouTube ↗

A short revision video from the MrBrownCS series.

Watch and think:

• Which mail protocol suits someone using a phone and a laptop?

Open on YouTube ↗

Data security in storage and transfer is a benefit of resilient environments (7.6.1).

Watch and think:

• Why does encryption improve resilience?

Open on YouTube ↗

A dramatised attack through an unsecured smart thermostat on an unsegmented network.

Watch and think:

• Which resilience methods would have stopped the attack?
• What did the company lose?

Open on YouTube ↗

How a ransomware attack comes together, and why patching, hardening and backups matter.

Watch and think:

• How did the attacker get in?
• How would tested backups change the outcome?

Open on YouTube ↗

A fully automated port that stops if its network fails: a real case for redundancy and reduced downtime.

Watch and think:

• Which resilience methods would you expect this port to use?

Open on YouTube ↗

Read the VectorUSA and Cisco case study ↗

Extra revision (data representation).

Watch and think:

• How does colour depth affect file size?

Open on YouTube ↗

Extra revision (data representation).

Watch and think:

• What is the sample rate?

Open on YouTube ↗

Extra revision (data representation).

Watch and think:

• Why was Unicode needed?

Open on YouTube ↗

Extra revision (logic).

Watch and think:

• When does an AND gate output 1?

Open on YouTube ↗

Extra revision (data structures).

Watch and think:

• What is the difference between an array and a record?

Open on YouTube ↗