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NEW QUESTION 51
E-mail traffic from the Internet is routed via firewall-1 to the mail gateway. Mail is routed from the mail gateway, via firewall-2, to the mail recipients in the internal network. Other traffic is not allowed. For example, the firewalls do not allow direct traffic from the Internet to the internal network.
The intrusion detection system (IDS) detects traffic for the internal network that did not originate from the mail gateway. The FIRST action triggered by the IDS should be to:
Answer: D
Explanation:
Traffic for the internal network that did not originate from the mail gateway is a sign that firewall-1 is not functioning properly. This may have been be caused by an attack from a hacker. Closing firewa!l-2 is the first thing that should be done, thus preventing damage to the internal network. After closing firewall-2, the malfunctioning of firewall-1 can be investigated. The IDS should trigger the closing of firewall-2 either automatically or by manual intervention. Between the detection by the IDS and a response from the system administrator valuable time can be lost, in which a hacker could also compromise firewall-2. An entry in the log is valuable for later analysis, but before that, the IDS should close firewall-2. If firewall-1 has already been compromised by a hacker, it might not be possible for the IDS to close it.
NEW QUESTION 52
When an IS audit reveals that a firewall was unable to recognize a number of attack attempts, the auditor's BEST recommendation is to place an intrusion detection system (IDS) between the firewall and:
Answer: A
NEW QUESTION 53
An existing system is being extensively enhanced by extracting and reusing design and program
components. This is an example of:
Answer: B
Explanation:
Section: Protection of Information Assets
Explanation:
Old (legacy) systems that have been corrected, adapted and enhanced extensively require reengineering to
remain maintainable. Reengineering is a rebuilding activity to incorporate new technologies into existing
systems. Using program language statements, reverse engineering involves reversing a program's
machine code into the source code in which it was written to identify malicious content in a program, such
as a virus, or to adapt a program written for use with one processor for use with a differently designed
processor. Prototyping is the development of a system through controlled trial and error. Software reuse is
the process of planning, analyzing and using previously developed software components. The reusable
components are integrated into the current software product systematically.
NEW QUESTION 54
Which of the following is the PRIMARY purpose for external assessments of internal audit's quality assurance (OA) systems and frameworks?
Answer: C
NEW QUESTION 55
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