81. Worm was made up

one program

two programs

three programs

all of these

82. An audit log

simply records the time

user

type of all access to an object

all of these

83. The security of a system can be improved by

threat monitoring

audit log

both (a) and (b)

none of these

84. Trap door

could be included in a compiler

pose a difficult problem because, to detect them

both (a) and (b)

none of these

85. Threat monitoring technique is

the system can check for suspicious patterns of activity in an attempt to detect a security violation

a time sharing a system that counts the number of incorrect passwords given

both (a) and (b)

none of these

86. Trojan Horse

A code segment that misuses its file is called Trojan horse

good for file accessing

both (a) and (b)

none of these

87. Protection against computer viruses is

preventation

practice of safe computing

purchasing unopened software from vendors

avoiding free or pirated copies from public sources

88. Program threats are

trap doors

Trojan Horse

both (a) and (b)

none of these

89. Viruses

are usually spread by users downloading viral programs from public bulletin boards or exchanging floppy disks containing an infection

are beneficial for program

both (a) and (b)

none of these

90. In one time password

the password is different in each instance

the password is same in each instance

both (a) and (b)

none of these

91. Viruses

another form of computer attack is virus

virus are designed to spread into other programs and can wreak havoc in a system

it modifying or destroying files and causing system crashes and program malfunctions

all of these

92. The most common approach to authenticating a user identity is

user passwords

user log in

hardware device

none of these

93. Boot strap or vector is called

grappling hook program

main program

secondary program

primary storage

94. A major security problem for operating system is

authentication problem

physical problem

human problem

none of these

95. 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

96. Global locks

synchronize access to local resources

synchronize access to global resources

are used to avoid local locks

prevent access to global resources

97. 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

98. 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

99. 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

100. 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