Operating System Mcqs

Page No. 99

What are the characteristics of the Hydra system?


aIt consists of known access rights and interpreted by the system


bA user can of protection system can declare other rights


cHydra system is not flexible


dHydra doesn’t provide rights amplification



How can Keys be defined or replaced?


acreate [keyname] [bits]


bset-key


cKey


dMAKE [Key Name]


View Answer set-key

What is true about Indirection to revoke capability?


aCapabilities point indirectly to the objects


bEach capability will not have a unique entry in global


cTable entries cannot be reused for other capabilities


dThis system was adopted in MULTICS system



What is false regarding Back-Pointers scheme to revoke capability?


aList of pointers is maintained with each object


bWhen revocation is required these pointers are followed


cThis scheme is not adopted in MULTICS system


dThese point to all capabilities associated with that object



What is the reacquisition scheme to revoke capability?


aWhen a process capability is revoked then it won’t be able to reacquire it


bPointers are maintained for each object which can be used to revoke


cIndirect pointing is done to revoke object’s capabilities


dMaster key can be used compare and revoke.



Why is it difficult to revoke capabilities?


aThey are too many


bThey are not defined precisely


cThey are distributed throughout the system


dNone of the mentioned



What are the incorrect methods of revocation of access rights?


aImmediate/Delayed


bSelective/General


cPartial/total


dCrucial


View Answer Crucial

Internet provides _______ for remote login.


atelnet


bhttp


cftp


drpc


View Answer telnet

The capability of a system to adapt the increased service load is called ___________


ascalability


btolerance


ccapacity


dnone of the mentioned


View Answer scalability

In distributed systems, link and site failure is detected by ___________


apolling


bhandshaking


ctoken passing


dnone of the mentioned


View Answer handshaking

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