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NEW QUESTION 43
Which of the following can best eliminate dial-up access through a Remote Access Server as a hacking vector?
- A. Using a TACACS+ server.
- B. Installing the Remote Access Server outside the firewall and forcing legitimate users to authenticate to the firewall.
- C. Setting modem ring count to at least 5.
- D. Only attaching modems to non-networked hosts.
Answer: B
Explanation:
Containing the dial-up problem is conceptually easy: by installing the Remote
Access Server outside the firewall and forcing legitimate users to authenticate to the
firewall, any access to internal resources through the RAS can be filtered as would any
other connection coming from the Internet.
The use of a TACACS+ Server by itself cannot eliminate hacking.
Setting a modem ring count to 5 may help in defeating war-dialing hackers who look for
modem by dialing long series of numbers.
Attaching modems only to non-networked hosts is not practical and would not prevent
these hosts from being hacked.
Source: STREBE, Matthew and PERKINS, Charles, Firewalls 24seven, Sybex 2000,
Chapter 2: Hackers.
NEW QUESTION 44
Devices that supply power when the commercial utility power system fails are called which of the following?
- A. power filters
- B. power dividers
- C. uninterruptible power supplies
- D. power conditioners
Answer: C
Explanation:
From Shon Harris AIO Fifth Edition:
Protecting power can be done in three ways: through UPSs, power line conditioners, and backup sources.
UPSs use battery packs that range in size and capacity. A UPS can be online or standby.
Online UPS systems use AC line voltage to charge a bank of batteries. When in use, the UPS has an inverter that changes the DC output from the batteries into the required AC form and that regulates the voltage as it powers computer devices.
Online UPS systems have the normal primary power passing through them day in and day out. They constantly provide power from their own inverters, even when the electric power is in proper use. Since the environment's electricity passes through this type of UPS all the time, the UPS device is able to quickly detect when a power failure takes place. An online UPS can provide the necessary electricity and picks up the load after a power failure much more quickly than a standby UPS.
Standby UPS devices stay inactive until a power line fails. The system has sensors that detect a power failure, and the load is switched to the battery pack. The switch to the battery pack is what causes the small delay in electricity being provided. So an online UPS picks up the load much more quickly than a standby UPS, but costs more of course.
NEW QUESTION 45
Which of the following are required for Life-Cycle Assurance?
- A. System Architecture and Design specification.
- B. Security Testing and Trusted distribution.
- C. Configuration Management and Trusted Facility Management.
- D. Security Testing and Covert Channel Analysis.
Answer: B
Explanation:
Explanation/Reference:
Security testing and trusted distribution are required for Life-Cycle Assurance.
The following answers are incorrect:
System Architecture and Design specification. Is incorrect because System Architecture is not requried for Life-Cycle Assurance.
Security Testing and Covert Channel Analysis. Is incorrect because Covert Channel Analysis is not requried for Life-Cycle Assurance.
Configuration Management and Trusted Facility Management. Is incorrect because Trusted Facility Management. is not requried for Life-Cycle Assurance.
NEW QUESTION 46
Which of the following was developed in order to protect against fraud in electronic fund transfers (EFT) by ensuring the message comes from its claimed originator and that it has not been altered in transmission?
- A. Cyclic Redundancy Check (CRC)
- B. Message Authentication Code (MAC)
- C. Secure Electronic Transaction (SET)
- D. Secure Hash Standard (SHS)
Answer: B
Explanation:
Explanation/Reference:
In order to protect against fraud in electronic fund transfers (EFT), the Message Authentication Code (MAC), ANSI X9.9, was developed. The MAC is a check value, which is derived from the contents of the message itself, that is sensitive to the bit changes in a message. It is similar to a Cyclic Redundancy Check (CRC).
The aim of message authentication in computer and communication systems is to verify that he message comes from its claimed originator and that it has not been altered in transmission. It is particularly needed for EFT Electronic Funds Transfer). The protection mechanism is generation of a Message Authentication Code (MAC), attached to the message, which can be recalculated by the receiver and will reveal any alteration in transit. One standard method is described in (ANSI, X9.9). Message authentication mechanisms an also be used to achieve non-repudiation of messages.
The Secure Electronic Transaction (SET) was developed by a consortium including MasterCard and VISA as a means of preventing fraud from occurring during electronic payment.
The Secure Hash Standard (SHS), NIST FIPS 180, available at http://www.itl.nist.gov/fipspubs/fip180-
1.htm, specifies the Secure Hash Algorithm (SHA-1).
Source:
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 4: Cryptography (page 170)
also see:
http://luizfirmino.blogspot.com/2011/04/message-authentication-code-mac.html and
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.22.2312&rep=rep1&type=pdf
NEW QUESTION 47
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