| Question.16 Controls to keep password sniffing attacks from compromising computer systems include which of the following? (A) static and recurring passwords. (B) encryption and recurring passwords. (C) one-time passwords and encryption. (D) static and one-time passwords. |
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Correct Answer: C
To minimize the chance of passwords being captured one-time passwords would prevent a password sniffing attack because once used it is no longer valid.
Encryption will also minimize these types of attacks.
The following answers are correct:
static and recurring passwords. This is incorrect because if there is no encryption then someone password sniffing would be able to capture the password much easier if it never changed. encryption and recurring passwords. This is incorrect because while encryption helps, recurring passwords do nothing to minimize the risk of passwords being captured. static and one-time passwords. This is incorrect because while one-time passwords will prevent these types of attacks, static passwords do nothing to minimize the risk of passwords being captured.
| Question.17 Kerberos can prevent which one of the following attacks? (A) tunneling attack. (B) playback (replay) attack. (C) destructive attack. (D) process attack. |
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Correct Answer: B
Each ticket in Kerberos has a timestamp and are subject to time expiration to help prevent these types of attacks.
The following answers are incorrect:
tunneling attack. This is incorrect because a tunneling attack is an attempt to bypass security and access low-level systems. Kerberos cannot totally prevent these types of attacks. destructive attack. This is incorrect because depending on the type of destructive attack, Kerberos cannot prevent someone from physically destroying a server. process attack. This is incorrect because with Kerberos cannot prevent an authorzied individuals from running processes.
| Question.18 In discretionary access environments, which of the following entities is authorized to grant information access to other people? (A) Manager (B) Group Leader (C) Security Manager (D) Data Owner |
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Correct Answer: D
In Discretionary Access Control (DAC) environments, the user who creates a file is also considered the owner and has full control over the file including the ability to set permissions for that file.
The following answers are incorrect:
manager. Is incorrect because in Discretionary Access Control (DAC) environments it is the owner/user that is authorized to grant information access to other people. group leader. Is incorrect because in Discretionary Access Control (DAC) environments it is the owner/user that is authorized to grant information access to other people. security manager. Is incorrect because in Discretionary Access Control (DAC) environments it is the owner/user that is authorized to grant information access to other people.
IMPORTANT NOTE:
The term Data Owner is also used within Classifications as well. Under the subject of classification the Data Owner is a person from management who has been entrusted with a data set that belongs to the company. For example it could be the Chief Financial Officer (CFO) who is entrusted with all of the financial data for a company. As such the CFO would determine the classification of the financial data and who can access as well. The Data Owner would then tell the Data
Custodian (a technical person) what the classification and need to know is on the specific set of data.
The term Data Owner under DAC simply means whoever created the file and as the creator of the file the owner has full access and can grant access to other subjects based on their identity.
| Question.19 What is the main concern with single sign-on? (A) Maximum unauthorized access would be possible if a password is disclosed. (B) The security administrator’s workload would increase. (C) The users’ password would be too hard to remember. (D) User access rights would be increased. |
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Correct Answer: A
A major concern with Single Sign-On (SSO) is that if a user’s ID and password are compromised, the intruder would have access to all the systems that the user was authorized for.
The following answers are incorrect:
The security administrator’s workload would increase. Is incorrect because the security administrator’s workload would decrease and not increase. The admin would not be responsible for maintaining multiple user accounts just the one.
The users’ password would be too hard to remember. Is incorrect because the users would have less passwords to remember.
User access rights would be increased. Is incorrect because the user access rights would not be any different than if they had to log into systems manually.
| Question.20 Who developed one of the first mathematical models of a multilevel-security computer system? A. Diffie and Hellman. B. Clark and Wilson. C. Bell and LaPadula. D. Gasser and Lipner. |
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Correct Answer: C
In 1973 Bell and LaPadula created the first mathematical model of a multi-level security system.
The following answers are incorrect:
Diffie and Hellman. This is incorrect because Diffie and Hellman was involved with cryptography.
Clark and Wilson. This is incorrect because Bell and LaPadula was the first model. The Clark-Wilson model came later, 1987.
Gasser and Lipner. This is incorrect, it is a distractor. Bell and LaPadula was the first model.