1. A major security problem for operating system is

authentication problem

physical problem

human problem

none of these

2. Real-time displays

are used only for capacity planning

are most useful for showing performance problems

are useless for capacity planning

cannot show the system paging rate

3. Global locks

synchronize access to local resources

synchronize access to global resources

are used to avoid local locks

prevent access to global resources

4. Control-unit busy

is the same as device busy

shows the availability of the path of devices

can be prevented with more devices

can be prevented by reducing the paging rate

5. A long-term process display should

show which processes used the most processor time

show process activity by time interval

show resources used by the most active processes

all of these

6. Device busy

is good, since that means the device is in use

is bad, since that means the device is not available

is bad only if the device busy rate is too high

depends upon the system paging rate

7. A long-term monitor

should show any immediate performance problems

should show I/O, paging, and processor activity

need show only the I/O and processor activity

usually reports only on terminal displays

8. Link encryption

is more secure than end-to-end encryption

is less secure than end-to-end encryption

cannot be used in a large network

is used only to detect errors

9. Seeks analysis

is used for analyzing paging problems

is used for analyzing device busy problems

is used for analyzing control-unit busy problems

is only shown on real-time displays

10. Trojan-Horse programs

are legitimate programs that allow unauthorized access

are hacker programs that do not show up on the system

really do not usually work

usually are immediately discovered