What is the need of protection?

• A. Prevent mischievous violation
• B. Prevent and intentional
• C. Ensure that each program component uses resources allotted to it only
• D. All of the mentioned

What are the incorrect methods of revocation of access rights?

• A. Immediate/delayed
• B. Selective/general
• C. Partial/total
• D. Crucial

Why is it difficult to revoke capabilities?

• A. They are too many
• B. They are not defined precicely
• C. They are distributed throughout the system
• D. None of the mentioned

What is the reacquisition scheme to revoke capability?

• A. When a process capability is revoked then it won’t be able to reacquire it
• B. Pointers are maintained for each object which can be used to revoke
• C. Indirect pointing is done to revoke object’s capabilities
• D. Master key can be used compare and revoke.

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

• A. List of pointers is maintained with each object
• B. When revocation is required these pointers are followed
• C. This scheme is not adopted in multics system
• D. These point to all capabilities associated with that object

What is true about Indirection to revoke capability?

• A. Capabilities point indirectly to the objects
• B. Each capability will not have a unique entry in global
• C. Table entries cannot be reused for other capabilities
• D. This system was adopted in multics system

How can Keys be defined or replaced?

• A. Create [keyname] [bits]
• B. Set-key
• C. Key
• D. Make [key name]

What are the characteristics of the Hydra system?

• A. It consists of known access rights and interpreted by the system
• B. A user can of protection system can declare other rights
• C. Hydra system is not flexible
• D. Hydra doesn’t provide rights amplification

What are the characteristics of rights amplification in Hydra?

• A. This scheme allows a procedure to be certified as trustworthy
• B. Amplification of rights cannot be stated explicitly in declaration
• C. It includes kernel rights such as read
• D. All of the mentioned

What is the problem of mutually suspicious subsystem?

• A. Service program can steal users data
• B. Service program can malfunction and retain some rights of data provided by user
• C. Calling program can get access to restricted portion from service program
• D. Calling program gets unrestricted access