Computer knowledge

A router is designed to forward data packets between different computer networks, directing traffic efficiently across the internet. Option C is correct as routers operate at the network layer to connect distinct networks. Option A is incorrect because a switch only connects devices within the same local network, rather than routing traffic between different networks.

Traditional ATM cards store account data on a black magnetic stripe on the back of the card, which is read by swiping it through a terminal. Distractors like RAM and ROM are internal computer memory types that require continuous power or specific circuitry to function, unlike passive magnetic cards.

RAM stands for Random Access Memory, which is the volatile primary memory of a computer that allows data to be read and written in any order. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.

• !Option A is incorrect because 'Read Access' is a misnomer; RAM is fully capable of both reading and writing operations, unlike read-only memory.
• !Option A is incorrect because a switch only connects devices within the same local network, rather than routing traffic between different networks.

Answer each from memory — you'll see instantly whether you're right and why.

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