Protection - Access Matrix - Operating System Questions & Answers

1.

What is Domain ?

   A.) Domain = Set of all objects
   B.) It is a collection of protection policies
   C.) Domain= set of access-rights
   D.) None of the mentioned

Answer: Option 'C'

Domain= set of access-rights

2.

In domain structure what is Access-right equal to ?

   A.) Access-right = object-name, rights-set
   B.) Access-right = read-name, write-set
   C.) Access-right = read-name, execute-set
   D.) Access-right = object-name, execute-set

Answer: Option 'A'

Access-right = object-name, rights-set

3.

What does access matrix represent ?

   A.) Rows-Domains, Columns-Objects
   B.) Rows-Objects, Columns-Domains
   C.) Rows-Access List, Columns-Domains
   D.) Rows-Domains, Columns-Access list

Answer: Option 'A'

Rows-Domains, Columns-Objects

4.

What are the three additional operations to change the contents of the access-matrix ?

   A.) copy
   B.) Owner
   C.) control
   D.) all of the mentioned

Answer: Option 'D'

all of the mentioned

5.

What is meaning of right-set ?

   A.) It is a subset consist of read and write
   B.) It is a subset of all valid operations that can be performed on the object
   C.) It is a subset consist of read,write and execute
   D.) None of the mentioned

Answer: Option 'B'

It is a subset of all valid operations that can be performed on the object

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