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Answer: B

The network layer switches and routes information (network
layer header). Node-to-node data link services are extended
across a network by this layer. The network layer provides
service for routing packets (units of information at the
network layer) between nodes connected through an arbitrary
network. The data link layer transmits information as
groups-of-bits (logical units called a frame) to adjacent
computer systems (node-to-node). The bits in a frame are
divided into an address field (media access control MAC 48
bit hardware address), control field, data field and error
control field. The transport layer, provides end-to-end data
integrity. To ensure reliable delivery, the transport layer
builds on the error control mechanisms provided by lower
layers. If lower layers do not do an adequate job, the
transport layer is the last chance for error recovery. The
session layer provides the control structure for
communications between applications. It establishes, manages
and terminates connections (sessions) between cooperating
applications and performs access security checking.

The MOST effective method of preventing unauthorized use of data files is: A. automated file entry. B. tape librarian. C. access control software. D. locked library.

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Separation of duties between computer opeartors and other data processing personnel is intended to: A. Prevent unauthorized modifications to program or data. B. Reduce overall cost of operations C. Allow operators to concentrate on their assigned duties D. Restrict operator access to data

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IS management has recently informed the IS auditor of its decision to disable certain referential integrity controls in the payroll system to provide users with a faster report generator. This will MOST likely increase the risk of: A. data entry by unauthorized users. B. a nonexistent employee being paid. C. an employee receiving an unauthorized raise. D. duplicate data entry by authorized users.

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A digital signature contains a message digest to: A. show if the message has been altered after transmission. B. define the encryption algorithm. C. confirm the identity of the originator. D. enable message transmission in a digital format.

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The difference between a vulnerability assessment and a penetration test is that a vulnerability assessment: A. searches and checks the infrastructure to detect vulnerabilities, whereas penetration testing intends to exploit the vulnerabilities to probe the damage that could result from the vulnerabilities. B. and penetration tests are different names for the same activity. C. is executed by automated tools, whereas penetration testing is a totally manual process. D. is executed by commercial tools, whereas penetration testing is executed by public processes.

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Which of the following issues should be included in the business continuity plan? A. The staff required to maintain critical business functions in the short, medium and long term B. The potential for a natural disaster to occur, such as an earthquake C. Disastrous events impacting information systems processing and end-user functions D. A risk analysis that considers systems malfunctions, accidental file deletions or other failures

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Which of the following tests confirm that the new system can operate in its target environment? A. Sociability testing B. Regression testing C. Validation testing D. Black box testing

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At the end of the testing phase of software development, an IS auditor observes that an intermittent software error has not been corrected. No action has been taken to resolve the error. The IS auditor should: A. report the error as a finding and leave further exploration to the auditee's discretion. B. attempt to resolve the error. C. recommend that problem resolution be escalated. D. ignore the error, as it is not possible to get objective evidence for the software error.

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Which of the following logical access exposures involves changing data before, or as it is entered into the computer? A. Data diddling B. Trojan horse C. Worm D. Salami technique

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To share data in a multivendor network environment, it is essential to implement program-to-program communication. With respect to program-to-program communication features that can be implemented in this environment, which of the following makes implementation and maintenance difficult? A. User isolation B. Controlled remote access C. Transparent remote access D. The network environments

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Which of the following data entry controls provides the GREATEST assurance that the data is entered correctly? A. Using key verification B. Segregating the data entry function from data entry verification C. Maintaining a log/record detailing the time, date, employee's initials/user id and progress of various data preparation and verification tasks D. Adding check digits

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The role of IT auditor in complying with the Management Assessment of Internal Controls (Section 404 of the Sarbanes-Oxley Act) is: A. planning internal controls B. documenting internal controls C. designing internal controls D. implementing internal controls

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