Question#1
What is the primary purpose of computer security?
a) To protect data and prevent hackers ✅ - Answer
b) To increase the speed of the computer
c) To reduce the cost of software
d) To enhance the visual appearance of the system

Question#2
Which of the following is a type of virus that mutates with every infection?
a) Parasitic virus
b) Memory-resident virus
c) Polymorphic virus ✅ - Answer
d) Boot sector virus

Question#3
What does the 'C' in CIA triad stand for?
a) Confidentiality ✅ - Answer
b) Control
c) Communication
d) Configuration

Question#4
Which security service ensures that data has not been modified?
a) Confidentiality
b) Integrity ✅ - Answer
c) Availability
d) Non-repudiation

Question#5
What is the main goal of a passive attack?
a) To modify the data
b) To obtain information without affecting system resources ✅ - Answer
c) To disrupt the network
d) To delete files

Question#6
Which mechanism is used to assure the integrity of a data unit?
a) Encipherment
b) Digital signature
c) Access control
d) Data integrity ✅ - Answer

Question#7
What is a masquerader in the context of intruders?
a) A legitimate user who misuses privileges
b) An individual not authorized to use the computer ✅ - Answer
c) A trusted third party
d) A system administrator

Question#8
Which of the following is a common method to protect against confidentiality breaches?
a) Using multi-factor authentication ✅ - Answer
b) Increasing network speed
c) Reducing the number of users
d) Disabling all security measures

Question#9
What is the purpose of traffic padding in security mechanisms?
a) To speed up data transmission
b) To frustrate traffic analysis attempts ✅ - Answer
c) To reduce the size of data
d) To encrypt all data automatically

Question#10
Which type of attack involves the creation of a false data stream?
a) Passive attack
b) Active attack ✅ - Answer
c) Eavesdropping
d) Denial of service

Question#11
What is the main objective of viruses?
a) To improve system performance
b) To spread along different hosts ✅ - Answer
c) To reduce network traffic
d) To enhance user experience

Question#12
Which of the following is not a pillar of information security?
a) Confidentiality
b) Integrity
c) Availability
d) Transparency ✅ - Answer

Question#13
What does a stealth virus do to avoid detection?
a) It changes its appearance and behavior ✅ - Answer
b) It deletes itself after infection
c) It speeds up the system
d) It asks for user permission

Question#14
Which security mechanism involves the use of a trusted third party?
a) Encipherment
b) Digital signature
c) Notarization ✅ - Answer
d) Access control

Question#15
What is the primary difference between active and passive attacks?
a) Active attacks modify data, passive attacks do not ✅ - Answer
b) Passive attacks are more harmful
c) Active attacks are easier to prevent
d) Passive attacks target hardware

Question#16
Which of the following is a feature of modern antivirus programs?
a) Network firewall ✅ - Answer
b) Increased system speed
c) Reduced power consumption
d) Automatic software updates

Question#17
What is the purpose of the OSI security architecture?
a) To define security attacks, mechanisms, and services ✅ - Answer
b) To increase network speed
c) To reduce the cost of security
d) To simplify user interfaces

Question#18
Which type of virus infects the master boot record?
a) Parasitic virus
b) Memory-resident virus
c) Boot sector virus ✅ - Answer
d) Polymorphic virus

Question#19
What is the main purpose of encryption in network security?
a) To increase data transmission speed
b) To mask the contents of messages ✅ - Answer
c) To reduce the size of data
d) To simplify data management

Question#20
Which of the following is a method to ensure data availability?
a) Using redundant networks ✅ - Answer
b) Deleting old data
c) Reducing user access
d) Disabling security measures