WGU C191 Module 4 Post Assessment Actual Final Exam Questions with all Questions Accurately Answered 2024/2025
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WGU C191
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WGU C191
WGU C191 Module 4 Post Assessment Actual Final Exam Questions with all Questions Accurately Answered 2024/2025
to use a disk to hold files - correct answer the OS needs to record its own data structures on the disk using partition, logical formatting, or clusters
partitions - correct answer p...
WGU C191 Module 4 Post Assessment
Actual Final Exam Questions with all
Questions Accurately Answered
2024/2025
to use a disk to hold files - correct answer the OS needs to record its own data
structures on the disk using partition, logical formatting, or clusters
partitions - correct answer partition the disk into one or more groups of cylinders, each
treated as a logical disk
logical formatting - correct answer "making a file system"
clusters - correct answer to increase efficiency most file systems group blocks
sector sparing - correct answer used to handle bad blocks
swap space - correct answer Virtual memory uses disk space as an extension of main
memory
- can be carved out of the normal file system or can be in separate disk partition
swap space management - correct answer - 4.3BSD allocates swap space when
process starts; holds text segment (the
program) and data segment
- Kernel uses swap maps to track swap-space use
- some systems allow multiple swap space
RAID - correct answer redundant array of inexpensive disks
- multiple disk drives provides reliability via redundancy
,- increases mean time to failure
- Frequently combined with NVRAM to improve write performance
- organized into six different levels
Mean Time to Repair (MTTR) - correct answer exposure time when another failure
could cause data loss
disk striping - correct answer uses a group of disks as one storage unit
Stripedmirrors(RAID1+0)ormirroredstripes(RAID0+1) - correct answer priced high
performance and high reliability
blocked interleaved parity (RAID4,5,6) - correct answer uses much less redundancy
hot-spare disks - correct answer - often a small number left unallocated, replacing a
failed disk and having data rebuilt on them
snapshot - correct answer a view of file system before a set of changes take place (i.e.
at a point in time)
Replication - correct answer - automatic duplication of writes between separate sites
for redundancy and disaster recovery
- can be synchronous or asynchronous
extensions - correct answer - RAID alone does not prevent or detect data corruption or
other errors, just disk failures
- Solaris ZFS adds checksums of all data and metadata
- ZFS also removes volumes, partitions
,checksums - correct answer - kept with pointer to object, to detect if object is the
right one and whether it changed
- Can detect and correct data and metadata corruption
Stable-Storage Implementation - correct answer - Stable storage means data is never
lost
- To implement stable storage:
- Replicate information on more than one nonvolatile storage media with independent
failure modes
- Update information in a controlled manner to ensure that we can recover the stable
data after any failure during data transfer or recovery
3 outcomes possible from disk write - correct answer successful completion, partial
failure, total failure
successful completion - correct answer The data were written correctly on disk
partial failure - correct answer A failure occurred in the midst of transfer, so only some
of the sectors were written with the new data, and the sector being written during the
failure may have been corrupted
total failure - correct answer The failure occurred before the disk write started, so the
previous data values on the disk remain intact
Executable file - correct answer A series of code sections that the loader can bring into
memory and execute
Name - correct answer A file attribute defining the symbolic file name, in human
readable format
, file concept - correct answer contiguous logical address space
who decided the file structure? - correct answer operating system and program
file attributes - correct answer Name, Identifier, Type, Location, Size, Protection, [Time,
date and user identification]
- info about files are kept in directory structure which is maintained on the disk
Identifier - correct answer A unique tag which identifies a file within the file system, in
non-human-readable format
Open-file table - correct answer An OS table containing information about all open files
file operations - correct answer create, open, read, write, seek, delete
- files are abstract data types
Sequential access - correct answer An access method where the information in the file
is processed in order, one record after another
pieces needed to manage open files - correct answer - file pointer, file-open count, disk
location of file, access rights
mandatory file locking - correct answer access is denied depending on locks held and
requested
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