emptFullMarks":null},{"id":"65dcbf35-72ab-44e1-ab3b-6f60cff98ccf","revisionId":"d96ff30f-e80f-4393-a91e-cc0bb5fa9c26","questionNumber":null,"questionType":"LA","specification":"An oceanographic research vessel is uploading a sonar scan dataset of size \$12 \\text{ GiB}\$ to a cloud server via a satellite link. The satellite link has a bandwidth of \$45 \\text{ Mbps}\$.","difficulty":7,"difficultyBand":"medium","totalMarks":4,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"8c2b6360-1000-43ed-9f92-9cb4cf2e59ea","label":null,"content":"Construct an expression to show the duration in seconds required to complete this transmission.\n\nYou are not required to evaluate the final expression.","markscheme":"- Converts $12\\text{ GiB}$ to bytes by multiplying by $1024^3$ (or $1024 \\times 1024 \\times 1024$ or $2^{30}$) M1\n- Converts bytes to bits by multiplying by $8$ to obtain $12 \\times 1024^3 \\times 8$ (or $12 \\times 2^{30} \\times 8$) M1\n- Converts $45\\text{ Mbps}$ to bits per second by multiplying by $10^6$ (or $1,000,000$) to get $45 \\times 10^6$ M1\n- Combines into a correct division expression: $$\\frac{12 \\times 1024 \\times 1024 \\times 1024 \\times 8}{45 \\times 1,000,000}$$ or $$\\frac{12 \\times 2^{30} \\times 8}{45 \\times 10^6}$$ (or equivalent forms) A1","marks":4,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"68f5c7c7-f33a-4a47-a747-67c4896fbc85","revisionId":"4330708b-e348-4954-8bbe-a063f84003c3","questionNumber":null,"questionType":"LA","specification":"A research station in Antarctica needs to transmit a meteorological dataset of size $4.5 \\text{ GiB}$ to a university server. The satellite uplink connection operates at a transmission speed of $15 \\text{ Mbps}$.","difficulty":7,"difficultyBand":"medium","totalMarks":4,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"cac1a9cd-e7ab-4c2a-8471-a2480376be19","label":null,"content":"Construct an expression to show the time, in seconds, required to complete this transmission.\n\nYou do not have to perform the calculation.","markscheme":"- Converts GiB to bytes: $4.5 \\times 1024 \\times 1024 \\times 1024$ (or $4.5 \\times 2^{30}$) B1\n- Converts bytes to bits by multiplying by $8$: $4.5 \\times 1024^3 \\times 8$ (or $4.5 \\times 2^{30} \\times 8$) M1\n- Converts Mbps to bits per second: $15 \\times 1,000,000$ (or $15 \\times 10^6$) B1\n- Divides the total bits by the speed to write the final expression: $\\dfrac{4.5 \\times 1024 \\times 1024 \\times 1024 \\times 8}{15 \\times 1,000,000}$ or $\\dfrac{4.5 \\times 2^{30} \\times 8}{15 \\times 10^6}$ A1","marks":4,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null}],"subjectCode":"gcse_computer_science","summaries":[{"id":"00254646-1893-44fb-a329-75c93c8f7447","difficultyBand":"easy","calculatorUse":null},{"id":"00ba0ade-dfc3-4ee3-9996-d6da7870199d","difficultyBand":"easy","calculatorUse":null},{"id":"026c5d96-0aa7-4c95-bcfd-662538695950","difficultyBand":"easy","calculatorUse":null},{"id":"02751fc9-b48c-4f11-b78e-c1d0d5787974","difficultyBand":"easy","calculatorUse":null},{"id":"03085bff-ef7e-4d1e-97de-d304c985797f","difficultyBand":"easy","calculatorUse":null},{"id":"04e425d9-2dad-4061-94db-b86ac53e27f3","difficultyBand":"medium","calculatorUse":null},{"id":"06c194d5-f71e-4c64-92c7-c1c7c36a0022","difficultyBand":"medium","calculatorUse":null},{"id":"075fb61f-4c42-41a1-86ff-7ea9ca66970d","difficultyBand":"easy","calculatorUse":null},{"id":"0b423ffa-2e76-4113-a772-6d92b992637b","difficultyBand":"medium","calculatorUse":null},{"id":"0c4681c9-b152-4d3c-9c14-800eef8145f6","difficultyBand":"medium","calculatorUse":null},{"id":"10d2a6a9-ef82-4737-bdca-82cea0eec30e","difficultyBand":"easy","calculatorUse":null},{"id":"111cd4fd-ad1e-4b50-ba18-629a3614b53c","difficultyBand":"easy","calculatorUse":null},{"id":"11f6ae43-1c59-4

Networks

Question 19

Networks Questions

Networks

Question 19

Networks Questions