Operating System (OS)
Four necessary conditions for deadlock to exist are: mutual exclusion, no-preemption, circular wait and

None of these
deadlock avoidance
race around condition
hold and wait
buffer overflow

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Operating System (OS)
The necessary conditions needed before deadlock can occur?

Mutual Exclusion, Hold and wait, No Preemption, Circular Wait
No Mutual Exclusion, Hold and wait, Preemption, Circular Wait
Mutual Exclusion, Hold and wait, Preemption, No Circular Wait
Mutual Exclusion, No Hold and wait, Preemption, Circular Wait

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Operating System (OS)
Uniform Symbols Table

consists of a full or partial list of the token's as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation
a permanent table which lists all key words and special symbols of the language in symbolic form
None of these
contains all constants in the program
a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure

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Operating System (OS)
Trojan-Horse programs

are hidden programs that do not show up on the system
are legitimate programs that allow unauthorized access
None of these
do not usually work
usually are immediately discovered

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