Href":"/gcse/computer-science/edexcel/questions","basePath":"/gcse/computer-science/edexcel/software/questions","formulaUrl":null,"initialIndex":27,"initialQuestionWindow":[{"id":"8d12679b-4ac3-4187-a591-5850d2e0d4b5","revisionId":"dd3f0289-9a86-4f64-a073-4b43eae65fdf","questionNumber":null,"questionType":"LA","specification":"","difficulty":8,"difficultyBand":"medium","totalMarks":2,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"e68191c3-12aa-4951-8c87-4a457746292f","label":null,"content":"An automated environmental controller runs an embedded telemetry application on a Linux server. The application is configured to append hourly sensor readings to a log file on an external storage drive mounted at `/mnt/secure_storage/sensor_data.csv`.\n\nDuring integration testing, a remote SSH shell diagnostic screen is captured as follows:\n\n![SSH terminal session showing directory listing and log file output](https://assets.mathsgenie.co.uk/aqa-qb/1e58a9ee-1367-46f4-bc1c-0de432019665.png)\n\nBased on this diagnostic output, give **two** reasons why this write error might occur.","markscheme":"- The application/script is running under a non-root user account (such as `user`) that only has read-only access, because the file `sensor_data.csv` is owned by `root` and set with `-rw-r--r--` permissions. B1\n- The parent directory `/mnt/secure_storage/` has permissions that prevent non-root user accounts from modifying or writing files within it. B1\n- The external storage drive has been mounted as a read-only filesystem (either due to mounting options, filesystem errors, or a physical write-protect switch on the SD card). B1\n- The external storage drive is full, meaning no new telemetry data can be written or appended. B1\n- The file `sensor_data.csv` is currently locked or being written to by another process. B1","marks":2,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"8de9eea6-a1db-4f9b-8ee9-1aeffab0273f","revisionId":"e3238eae-ce38-4cf0-a886-d52f5fd57a3a","questionNumber":null,"questionType":"LA","specification":"An embedded smart home hub uses a single-core microcontroller running a multitasking operating system to concurrently process sensor data feeds, update a local LCD display, and transmit alerts to a cloud server.","difficulty":7,"difficultyBand":"medium","totalMarks":4,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"6db27576-c308-42be-acf5-b245529d0b1f","label":null,"content":"Explain how the operating system's scheduler manages the execution of these competing tasks on the single-core CPU, and how it ensures all tasks appear to run simultaneously.","markscheme":"- The OS places active tasks into a queue (such as a ready queue) and uses a scheduling algorithm to determine the order of execution. M1\n- Each task is allocated a small, discrete segment of CPU processing time, known as a time slice or quantum. M1\n- When a task's time slice expires (or a high-priority interrupt is received), a context switch occurs where the current task's execution state/registers are saved and the next task's state is loaded. M1\n- The OS performs these switches at a very high frequency, which creates the illusion of concurrent or simultaneous execution on the single-core CPU. A1","marks":4,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"98ca85ed-ac77-4f2d-9377-48441add6dd3","revisionId":"e7e085ac-0d32-4a79-8842-dcf9328793e6","questionNumber":null,"questionType":"MC","specification":"A network administrator configures an incremental backup utility to run nightly on an enterprise file server. Which of the following best describes the precise operation and purpose of this utility during its nightly run?","difficulty":6,"difficultyBand":"medium","totalMarks":1,"sourceTitle":null,"calculatorUse":null,"parts":[],"options":[{"id":"

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Question 11

Software Questions

Software

Question 11

Software Questions