Consider a system where free space is kept in a free-space list. a. Suppose that the pointer to the free-space list is lost. Can the system reconstruct the free-space list? Explain your answer. b. Consider a file system similar to the one used by UNIX with indexed allocation. How many disk 1/0 operations might be required to read the contents of a small local file at /a/b/c? Assume fah I bl

Consider a system where free space is kept in a free-space list. a. Suppose that the pointer to the free-space list is lost. Can the system reconstruct the free-space list? Explain your answer. b. Consider a file system similar to the one used by UNIX with indexed allocation. How many disk 1/0 operations might be required to read the contents of a small local file at /a/b/c? Assume fah I bl

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Consider a system where free space is kept in a free-space list. a. Suppose that the pointer to the free-space list is lost. Can the system reconstruct the free-space list? Explain your answer. b. Consider a file system similar to the one used by UNIX with indexed allocation. How many disk 1/0 operations might be required to read the contents of a small local file at /a/b/c? Assume that none of the disk blocks is currently being cached. c. Suggest a scheme to ensure that the pointer is never lost as a result of memory failure.
The following utility tool(s) may be used by us in order to investigate the File System (such as NTFS) of a partition or volume:The grouping of answer choicesDISKPART \sFSUTIL \sWMICAnything that was discussed before
Both the utmp file and any directory are organized as a sequence of structs. Consider the two structs definitioned here: struct { char a; int b; char c; } one; struct { char a; char c; int b; } two; Which of the following is true? If you don't know the answer (we did discuss this in class), experiment in order to find the answer. struct one takes up more memory than struct two. struct two takes up more memory than struct one. They both take up the same amout of memory.
Consider user accounts on a computer system with a Web server configured to provide user Web areas. In general, this uses a standard directory name, such as “public_html,” in a user’s home directory. However, access control needs to be properly set to allow users (with or without user accounts on the system) to browse the webpages. Assuming there are one main page (index.html), two pictures files (a.jpg and b.jpg) stored in an sub-directory (Image) and one pdf file (c.pdf) stored in an sub-directory (Doc), all under the public_html. (a) Specify the access matrix for each directory (excluding home directory) and files that allows everyone to view the webpage. (b) Draw a directed graph that represented to the access matrix
Suppose we have a Unix file system with block size of 8 Kbyte and pointers with size of 4 bytes. How large a file can be represented using only single indirect pointer in inode? A. 8 Kbyte B. 2K * 8 Kbyte C. 2K * 2K * 8 Kbyte D. 2K * 2K * 2K * 8 Kbyte
Assuming 4K clustering for a 500-byte file, what is the size (in bytes) of the File Slack? O 12 bytes O 1536 bytes O 3584 bytes O 4096 bytes
Can Some one please answer I am bit confused Because I think the answer is No. Can someone explain what is the correct answer with a proper explantion.
Dynamically linked programs use up less space on the hard disk than statically linked programs do. Which of the following would you anticipate using up the most memory (RAM) while it is active? Why?
Given a directory tree of a file system, if /usr/jeff is the working directory, what is the absolute path name for the file whose relative path name is ../ast/z?
3. Which stack protection techniques are vulnerable to return-orlented programming? a. Stack Canaries b. Address space layout randomization c. Limiting Executable Code Regions 4. In malloclab, several students implemented an optimization where small blocks would be allocated at the beglinning of a free block, and large blocks would be allocated at the end of a free block. In what way was this useful on some traces? a. It increases the memory utilization due to less Internal fragmentation. b. It increagos tho momory utlization duo to moro coaloscing opportunities. c. Itincreases the throughput due to smaller free lists. d. It increases the throughput due to better temporal locality in caches. 5. After a forki), to access which datastnuctures, should the resulting two processes synchronize? а. Неар b. Stack c. Registers d. Globals e. Program Code
Matlab: Suppose I had this matrix A = [3.50, 99.50, 100.34] How do I create an output file where the decimals line up like this? Each decimal is below the other decimal exactly 3.50 99.50 100.34
Turn on the Non-executable Stack Protection Operating systems used to allow executable stacks, but this has now changed: In Ubuntu OS, the binary images of programs (and shared libraries) must declare whether they require executable stacks or not, i.e., they need to mark a field in the program header. Kernel or dynamic linker uses this marking to decide whether to make the stack of this running program executable or non-executable. This marking is done automatically by the gcc, which by default makes stack non-executable. We can specifically make it nonexecutable using the "-z noexecstack" flag in the compilation. In our previous tasks, we used "-z execstack" to make stacks executable. In this task, we will make the stack non-executable. We will do this experiment in the shellcode folder. The callshellcode program puts a copy of shellcode on the stack, and then executes the code from the stack. Please recompile call shellcode.c into a32.out and a64.out, without the "-z execstack"…