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NEW QUESTION 41
Which conceptual approach to intrusion detection system is the most common?
- A. Host-based intrusion detection
- B. Knowledge-based intrusion detection
- C. Statistical anomaly-based intrusion detection
- D. Behavior-based intrusion detection
Answer: B
Explanation:
There are two conceptual approaches to intrusion detection. Knowledge-based intrusion detection uses a database of known vulnerabilities to look for current attempts to exploit them on a system and trigger an alarm if an attempt is found. The other approach, not as common, is called behaviour-based or statistical analysis-based. A host-based intrusion detection system is a common implementation of intrusion detection, not a conceptual approach. Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 3: Telecommunications and Network Security (page 63). Also: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, McGraw-Hill/Osborne, 2002, chapter 4: Access Control (pages 193-194).
NEW QUESTION 42
You wish to make use of “port knocking” technologies. How can you BEST explain this?
- A. Port knocking is where the port sequence is encrypted with 3DES and only the server has the other key to decrypt the port sequence.
- B. This is where all the ports are open on the server and the connecting client scans the open port to which he wants to connect to see if it’s open and running.
- C. Port knocking is where the user calls the server operator to have him start the service he wants to connect to.
- D. Port knocking is where the client will attempt to connect to a predefined set of ports to identify him as an authorized client.
Answer: D
Explanation:
Explanation/Reference:
Explanation:
Port knocking is an authentication method used by network administrators to control access to computers or other network devices behind a firewall. Port knocking takes advantage of firewall rules to allow a client who knows the “secret knock” to enter the network through a particular port by performing a sequence of connection attempts (called a knock sequence). The correct knock sequence for any given port is created for specific IP addresses by the network administrator. A small program called a daemon monitors the firewall log files for connection requests and determines whether or not a client seeking the network is on the list of approved IP addresses and has performed the correct knock sequence. If the answer is yes, it opens the associated port and allows access. Of course, if unauthorized personnel discover the knock sequence, then they, too, can gain access.
Incorrect Answers:
B: Port knocking is not where the user calls the server operator to have him start the service he wants to connect to.
C: Port knocking is not where all the ports are open on the server and the connecting client scans the open port to which he wants to connect to see if it’s open and running.
D: Port knocking is not where the port sequence is encrypted with 3DES and only the server has the other key to decrypt the port sequence.
References:
http://whatis.techtarget.com/definition/port-knocking
http://www.portknocking.org/
NEW QUESTION 43
Refer to the information below to answer the question.
Desktop computers in an organization were sanitized for re-use in an equivalent security environment. The data was destroyed in accordance with organizational policy and all marking and other external indications of the sensitivity of the data that was formerly stored on the magnetic drives were removed.
Organizational policy requires the deletion of user data from Personal Digital Assistant (PDA) devices before disposal. It may not be possible to delete the user data if the device is malfunctioning. Which destruction method below provides the BEST assurance that the data has been removed?
- A. Knurling
- B. Degaussing
- C. Grinding
- D. Shredding
Answer: D
NEW QUESTION 44
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