Computer Science

Network defence

The cost of cybercrime

Non-automated cybercrime

Automated cybercrime

Fighting fire with fire

Where is the danger?

Being part of the solution

Security

It allows an organisation to resume business quickly during or after a disaster, which could include a cyberattack.

It is an archiving policy that determines how long data can be kept for.

It states how a network may be used including what is and what is not acceptable, e.g. online shopping or gambling.

It usually contains both an archiving policy and a network use policy.

Which of the following most accurately defines an acceptable use policy?

A firewall blocks unexpected connections coming into the network; most operating systems include a firewall.

A firewall sits between a local network or computer and another network, controlling incoming and outgoing network traffic.

A firewall’s rules determine which traffic is allowed through and which isn’t.

Tick all the three correct firewall-related sentences below.

Firewalls stop viruses from entering the network

The process of encoding data or a message so that it cannot be understood by anyone other than its intended recipient

Which of the following is the most accurate description of encryption?

By blocking any input that comes via the web

By ensuring that only correct data is input

By ensuring that programmers do not use SQL when designing a database

By including code that removes any SQL commands from the input data, preventing a hacker from gaining control of the database

How does input sanitisation tackle SQL injection?

Checking individual subprograms, subroutines, classes, or procedures in a program

Giving a number value to a key: each plain text letter is replaced by a new letter, the one found at the original letter's position in the alphabet plus or minus the value of the key

The use of an algorithm to use two keys: a public key and a private key

Which of the following definitions describes asymmetric encryption?

This lesson will be removed by the end of the Spring Term 2026.

Network defence

Lesson outcome

This lesson will be removed by the end of the Spring Term 2026.