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IN1011 Operating Systems (PRD2 A 2024/25)

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A process that requires 8.2 MB of space is swapped to a hard disk. The  transfer rate to the disk is 108.4 MB/s and there is a further latency of 7.3 microseconds. Calculate the total Context Switch Swapping time (that is swap out and swap in) of this process. Write down your answer in milliseconds.

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A file that exists in a directory  has the permissions shown in the image, identify the permissions in a numeric way.

--w--w--w-

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Visit the Common Vulnerabilities and Exposures (CVE) website (https://www.cvedetails.com/top-50-products.php). Select the year 2003

, and observe which products had the highest number of vulnerabilities. Select the top five products (i.e. highest number of vulnerabilities). If you cannot find this year, select any year and then edit the date in

the URL e.g.,

https://www.cvedetails.com/top-50-products.php?year=2022.

(

Whilst

you are there, study other years. Is there a pattern on how things have

changed over the years? Are there any products that you expected to be

there but were not? Or the reverse?

)

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A file that exists in a directory  has the permissions shown in the image, identify the permissions in a numeric way.

-rwxrwxrwx

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A system with a First In First Out page replacement algorithm can store 3 pages in memory at any given time.

Assume that a series of pages arrive in the following order:

 (first)   7,0,1,3,7,2   (last)

The diagram below illustrates the process, three time points have already been completed:

Complete the remaining pages with the incoming pages. Answer which pages are stored in the locations denoted "a?" and "b?". Write down your answer as a two digit response, e.g. if the pages were 8 and 9, write down 89 without spaces, commas or other symbols

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The following image contains a listing of a unix directory with one of the attributes enclosed in a red box. Select the correct attribute from the options below.

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A file that exists in a directory  has the permissions shown in the image, identify the permissions in a numeric way.

--w--w--w-

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Identify the correct permissions that are granted with the following command

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A system with a First In First Out page replacement algorithm can store 3 pages in memory at any given time.

Assume that a series of pages arrive in the following order:

 (first)   7,0,1,2,3,7   (last)

The diagram below illustrates the process, three time points have already been completed:

Complete the remaining pages with the incoming pages. Answer which pages are stored in the locations denoted "a?" and "b?". Write down your answer as a two digit response, e.g. if the pages were 8 and 9, write down 89 without spaces, commas or other symbols

View this question

Visit the Common Vulnerabilities and Exposures (CVE) website (https://www.cvedetails.com/top-50-products.php). Select the year 2002, and observe which products had the highest number of vulnerabilities. Select the top five products (i.e. highest number of vulnerabilities). If you cannot find this year, select any year and then edit the date in the URL e.g., https://www.cvedetails.com/top-50-products.php?year=2022.

(Whilst you are there, study other years. Is there a pattern on how things have changed over the years? Are there any products that you expected to be there but were not? Or the reverse?)

View this question

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