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COP4610 Final questions and correct answers graded A+ passed
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COP4610 Final questions and correct answers graded A+ passed
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COP4610 FinalFile - correct answer ✔✔a named collection of blocks
File header - correct answer ✔✔associates the file with its disk sectors
I_node - correct answer ✔✔UNIX file header, stored in a special array with fixed number of array entries;
not stored near data blocks on disc
Directory - correct answer ✔✔a table of filenames and i-nodes, implemented as normal files, containing
file names and i_node numbers, only the OS is permitted to modify directories
Name collisions - correct answer ✔✔multiples files with the same name
Absolute path name - correct answer ✔✔path from the root directory to the file
Path resolution - correct answer ✔✔many levels of directory lookups
Metadata - correct answer ✔✔free blocks, directories, file headers, indirect blocks; heavily cached for
performance
Fsck - correct answer ✔✔run when crashes occur to repair in-progress operations
Log - correct answer ✔✔journal that is never erased
Two-phase locking - correct answer ✔✔acquire all locks and then perform updates and release all locks
Striping - correct answer ✔✔technique of segmenting logically sequential data, such as a file, so that
consecutive segments are stored on different physical storage devices (from Wikipedia)
, Security - correct answer ✔✔Policy of authorizing accesses, Prevents intentional misuses of system
Protection - correct answer ✔✔The actual mechanisms implemented to enforce the specialized policy,
prevents either accidental or intentional misuses
Access Matrix - correct answer ✔✔describes who can do what, the matrix tends to be sparse.
Access control list - correct answer ✔✔Stores all permissions for all users with each object, Analogy a
guard at the front door, UNIX: permission of each file is specified according to its owner, group, and the
world.
Capability list - correct answer ✔✔Stores all objects a process can touch. Analogy: Keys a key owner has
the right of entry. Example: page tables- each process has a list of pages that it can access.
Protocols - correct answer ✔✔an agreement between two parties as to how information is to be
transmitted. A network protocol abstracts packets into messages
Port - correct answer ✔✔way that your router can direct Internet traffic to a particular device within
your network
Byzantine uncertainty - correct answer ✔✔over an unreliable network, we can not guarantee that two
computers will synchronize
Two phase commit - correct answer ✔✔multiple machines agree to something atomically, but not
necessarily at the same time
Distributed Systems - correct answer ✔✔allows physically separate computers to work together; easier
and cheaper to mass produce simple computers; a company can incrementally increase the computing
power
Network - correct answer ✔✔physical connection that allows two computers to communicate
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