Hello everyone! Are you all getting ready for exams? Today, we're diving into solving another paper, specifically Computer Science Paper 1, 'Computer Systems,' for May/June 2023 (code 21011). It's a 1 hour 45 minutes exam with a weight of 75 marks. Remember, answer in the question paper itself; no extra materials needed. Use a black or dark blue pen, or an HB pencil for diagrams. Make sure to write your name, center number, and candidate number on each page. Let's tackle question 1 about the binary system. Binary, as we know, is base 2, so we'd mark that. Decimal is base 10, and hexadecimal is base 16.
Moving on to question 2, converting denary to binary. Remember, find the bits that add up to the number, like 15 is 8+4+2+1. For negative numbers, use two's complement. Remember the steps: find binary, flip bits, add one. Now question 3, adding two 8-bit binaries. Remember, nibbles are groups of 4 bits. Watch out for overflow errors if the result exceeds 255.
Question 4, explaining packet switching. Remember the steps: data into packets, routers find paths, packets reordered at destination. Next, secondary storage devices. We circle CD, HDD, and SSD. Remember, secondary storage is for files and software.
Question 5, sensors for the drinking system are flow, pressure, and weight. Then how they work: sensors send data, microprocessor compares, and if needed, signals to refill the water. Repeat until done. Question 6, connecting to a network needs a NIC. MAC address is assigned by the manufacturer, and dynamic IP addresses can change each time.
For question 7, low-level languages are close to machine code, using mnemonics like assembly or machine code itself. Reasons to use low-level languages include direct hardware manipulation, memory efficiency, and no need for a compiler. Finally, question 8 on Brute Force attacks. It's trial and error to guess passwords, manually or with software. Goals include stealing data, altering, or deleting it, and even damaging a company's reputation.
So there you have it, a rundown of the key points for each question. Remember, understanding these concepts well will help you tackle any similar questions in the exam. Good luck with your preparation!
Here's the rundown: it's a 1-hour 45-minute paper, worth 75 marks. You'll need a black or dark blue pen or HB pencil, and remember, no brand names for software or hardware!
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Good luck with your exams! Our prayers are with you, and remember, we're here for you. Take care, and remember to subscribe to the channel for more helpful tips and updates. Best of luck!
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IGCSE | O Level Computer Science 2023 - The Scenario-based Question - 15 Marks Specimen Paper 2B
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