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COP 4600 - FINAL EXAM QUESTIONS AND 100% CORRECT ANSWERS LATEST UPDATE
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COP 4600 - FINAL EXAM QUESTIONS AND 100% CORRECTANSWERS LATEST UPDATE
What is a path? - ANSWER A path is a sequence of directories used to reference a file.
They can be relative or absolute.
Why do we need file systems? - ANSWER 1. Locate free storage space
2. Store information in a persistent way (survives process termination)
3. Allow more than one process to access the information store concurrently
4. Find information by human-accessible identifiers
5. Protect data from unauthorized use
6. Identifying types of data stored and programs that can read the data
How are directories implemented? - ANSWER Directories can be implemented in-line or
via reference -> Variable attribute/name size
Why do we mount filesystems? - ANSWER We mount a file system to make it accessible
to programs through the operating system.
Problems with mounting file system? -ANSWER Where would the root of the file system
appear to the user?
How should the various device be presented to the user?
When accessing file system on a device, we must know? - ANSWER boot block,
Filesystem type/organization (super block), and where is the root directory
What does the file system superblock contain? - ANS The file system superblock
maintains data about its type, format, and organization
,What happens because you have issued a mounting call in Unix - ANS Copies
Superblock from disk to be mounted to the superblock table in main memory.
Sets pointers in the directory inode to FS mounted
What are the techniques/strategies for file allocation? - ANS 1. Contiguous
allocation-all-in-a-row
2. Linked list allocation(block)
3. Chained table allocation(FAT)
4. Indexed allocation(index nodes)
5. Chained indexed allocation(index + linked list)
6. Multi-level indexed allocation(tree structure)
Hardware is an abstraction that provides primarily two things- ANSWER 1. Read block
at index "k"
2. Write block at index "k"
3. Allocate and Deallocate
Contiguous allocation- ANSWER DEFINITION: The contents of a file are stored purely in
order on the drive
CONS: Suffers from external fragmentation, because it is a contiguous approach of
system memory
Linked List Allocation - ANSWER DEFINITION: Each block contains a pointer to the next.
Requires iteration through drive blocks-drive accesses-for random access
CONS: Problematic in large files; App has to iterate through each node.
Chained Table Allocation- ANSWER DEFINITION: Chain store the linked list as a table in
memory to minimize disk access. It is called a File Allocation Table FAT
Indexed Allocation - ANSWER DEFINITION: Indexed allocation stores locations of each
, block in an index block referenced by the file control block
CONS: A pure index system limits file size
Multi-level Indexed Allocation - ANSWER Use direct and indirect blocks to increase
maximum file size
Chained Indexed Allocation - ANSWER Direct blocks with an additional indirect pointer
What are Inodes? - ANSWER 1. Index Nodes
2. Store file block information, along with some block pointers - but are usually smaller
(128B or 256B
(T/F) Does a bigger block size have a better data rate? - ANSWER True
T/F A bigger the block size implies a good disk space utilization. - ANSWER False
What about if it has a worse disk space utilization? - ANSWER Internal Fragmentation
T/F A smaller block size therefore a better data rate - ANSWER False, lower data rate
T/F A smaller block size therefore good disk space utilization - ANSWER True
MS-DOS File System - ANSWER 1. Maximum partition size for different block sizes.
2. The blank boxes are the forbidden combinations.
How would you keep track of a free block? - ANSWER (a) Store free list on a linked list
(b) A bitmap
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