Programs that run independently and travel between computers and across networks

Knowing the Differences Can Help You to Better Protect your Computer

A computer virus attaches itself to a program or file so it can spread from one computer to another, leaving infections as it travels. Much like human viruses, computer viruses can range in severity: Some viruses cause only mildly annoying effects while others can damage your hardware, software or files. Almost all viruses are attached to an executable file, which means the virus may exist on your computer but it cannot infect your computer unless you run or open the malicious program. It is important to note that a virus cannot be spread without a human action, (such as running an infected program) to keep it going. People continue the spread of a computer virus, mostly unknowingly, by sharing infecting files or sending e-mails with viruses as attachments in the e-mail.

A worm is similar to a virus by its design, and is considered to be a sub-class of a virus. Worms spread from computer to computer, but unlike a virus, it has the capability to travel without any help from a person. A worm takes advantage of file or information transport features on your system, which allows it to travel unaided. The biggest danger with a worm is its capability to replicate itself on your system, so rather than your computer sending out a single worm, it could send out hundreds or thousands of copies of itself, creating a huge devastating effect. One example would be for a worm to send a copy of itself to everyone listed in your e-mail address book. Then, the worm replicates and sends itself out to everyone listed in each of the receiver's address book, and the manifest continues on down the line. Due to the copying nature of a worm and its capability to travel across networks the end result in most cases is that the worm consumes too much system memory (or network bandwidth), causing Web servers, network servers and individual computers to stop responding. In more recent worm attacks such as the much-talked-about .Blaster Worm., the worm has been designed to tunnel into your system and allow malicious users to control your computer remotely.

A Trojan horse is not a virus. It is a destructive program that looks as a genuine application. Unlike viruses, Trojan horses do not replicate themselves but they can be just as destructive. Trojans also open a backdoor entry to your computer which gives malicious users/programs access to your system, allowing confidential and personal information to be theft.

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In a LAN environment, which of the following minimizes the risk of data corruption during transmission? A. Using end-to-end encryption for data communication B. Using separate conduits for electrical and data cables C. Using check sums for checking the corruption of data D. Connecting the terminals using a star topology

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The primary role of an IS auditor during the system design phase of an application development project is to: A. advise on specific and detailed control procedures. B. ensure the design accurately reflects the requirement. C. ensure all necessary controls are included in the initial design. D. advise the development manager on adherence to the schedule.

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Which of the following is a function of an IS steering committee? A. Monitoring vendor controlled change control and testing B. Ensuring a separation of duties within the information's processing environment C. Approving and monitoring major projects, the status of IS plans and budgets D. Responsible for liaison between the IS department and the end users

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If the decision has been made to acquire software rather than develop it internally, this decision is normally made during the: A. requirements definition phase of the project. B. feasibility study phase of the project. C. detailed design phase of the project. D. programming phase of the project.

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Congestion control is BEST handled by which OSI layer? A. Data link B. Session layer C. Transport layer D. Network layer

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The use of object-oriented design and development techniques would MOST likely: A. facilitate the ability to reuse modules. B. improve system performance. C. enhance control effectiveness. D. speed up the system development life cycle.

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Applying a retention date on a file will ensure that: A. data cannot be read until the date is set. B. data will not be deleted before that date. C. backup copies are not retained after that date. D. datasets having the same name are differentiated.

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Which of the following is a dynamic analysis tool for the purpose of testing software modules? A. Blackbox test B. Desk checking C. Structured walk-through D. Design and code

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During a review of a customer master file an IS auditor discovered numerous customer name duplications arising from variations in customer first names. To determine the extent of the duplication the IS auditor would use: A. test data to validate data input. B. test data to determine system sort capabilities. C. generalized audit software to search for address field duplications. D. generalized audit software to search for account field duplications.

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Capacity monitoring software is used to ensure: A. maximum use of available capacity. B. that future acquisitions meet user needs. C. concurrent use by a large number of users. D. continuity of efficient operations.

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Which of the following types of data validation editing checks is used to determine if a field contains data, and not zeros or blanks? A. Check digit B. Existence check C. Completeness check D. Reasonableness check

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In a data warehouse, data quality is achieved by: A. cleansing. B. restructuring. C. source data credibility. D. transformation.

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Is a program that runs independently and travels between computers and across networks?

What software is the software that helps run the computer and coordinates instructions between the computer and the hardware devices?

Which type of software program is capable of reproducing itself as it spreads from one computer to another?

Which type of software program is capable of reproducing itself as a spreads from one computer to another quizlet?