Question 4) A+ Operating Systems Technologies

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Editor’s Note: This post is outdated. For an updated guide see Jed Reisner’s A+ 220-801 and 220-802 guide.

Objective: Diagnosing and Troubleshooting
SubObjective: Recognize common operational and usability problems and determine how to resolve them.

Single Answer Multiple Choice

You have antivirus software installed on your computer. However, you have neglected to update the virus definitions and it now appears that a virus has infected your computer, making it very slow. What is the best course of action under the circumstances?

A. Boot with a boot floppy disk, and run the antivirus software from the hard drive.
B. Install the latest virus definitions on the hard drive, and scan for viruses.
C. Boot with an updated antivirus boot floppy disk, and run the antivirus software from the floppy disk.
D. Boot with a boot floppy disk, install the latest virus definitions on the hard drive, and run the antivirus.

Answer:
C. Boot with an updated antivirus boot floppy disk, and run the antivirus software from the floppy disk.

Tutorial:
Booting with an updated antivirus floppy disk and running the antivirus software from the floppy disk is the best solution. This solution provides a clean boot environment, which is necessary for the antivirus to run properly. This solution is also the best in a scenario where a virus infection prevents a computer from booting. A bootable antivirus CD is an equivalent that can be used in place of the floppy disk.

Booting with a boot floppy disk and running the antivirus from the hard drive may not catch some viruses because the virus definitions on the hard drive are not up to date.

Installing the latest virus definitions on the hard drive and scanning for virus may not catch viruses that have already loaded into memory while booting from the infected hard drive. To reliably detect viruses, antivirus software must run before viruses load into memory. This usually requires that the computer be clean booted with a boot floppy disk or a bootable CD-ROM disk before running the virus scanner.

Booting with a boot floppy disk, installing the latest virus definitions on the hard drive, and running the antivirus is not the best solution because the antivirus software on the hard drive may have been affected by the virus. Additionally, installing software on a virus-infected computer may adversely affect chances of data recovery in case viruses have deleted data files. A better solution would be to run the virus scanner off an antivirus boot floppy disk.

These questions are derived from the Self Test Software Practice Test for CompTIA exam #220-302 – A+ Operating Systems Technologies, 2003 Objectives

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