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

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dHydra doesn’t provide rights amplification

✖



How can Keys be defined or replaced?


acreate [keyname] [bits]

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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

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cTable entries cannot be reused for other capabilities

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dThis system was adopted in MULTICS system

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


aList of pointers is maintained with each object

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bWhen revocation is required these pointers are followed

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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

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cIndirect pointing is done to revoke object’s capabilities

✖


dMaster key can be used compare and revoke.

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Why is it difficult to revoke capabilities?


aThey are too many

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bThey are not defined precisely

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cThey are distributed throughout the system

✓


dNone of the mentioned

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What are the incorrect methods of revocation of access rights?


aImmediate/Delayed

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bSelective/General

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cPartial/total

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dCrucial

✓


View Answer Crucial

Internet provides _______ for remote login.


atelnet

✓


bhttp

✖


cftp

✖


drpc

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View Answer telnet

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


ascalability

✓


btolerance

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ccapacity

✖


dnone of the mentioned

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View Answer scalability

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


apolling

✖


bhandshaking

✓


ctoken passing

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dnone of the mentioned

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View Answer handshaking

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