MCSE : Security Specialist
Network connection
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Is the correct user name and password being used
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Are the proper protocols installed
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Are network cables loose, damaged, connected or to long
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Is the network adapter card working properly (see
above)
Viruses and virus types
What they are
A
computer virus is a program designed to spread itself by first
infecting executable files or the system areas of hard and floppy
disks and then making copies of itself.
Types of Viruses
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Boot Sector Stays resident by infecting the boot sector
of the computer. Each time the system is booted, it is
re-infected from its own boot sector. Any time a floppy disk is
inserted into the drive, the floppy’s boot sector is infected.
If a machine is booted from or even if an infected floppy disk
is left in the floppy drive when the system is rebooted, that
computer will then be infected.
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FAT Virus infects the File Allocation Table of a hard
drive, these usually cause a loss of files that are on a hard
drive.
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Memory viruses are viruses that execute and stay resident
in memory.
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Macro viruses are viruses that attach themselves to
documents in the form of macros. Usually in Microsoft Word and
Microsoft Excel documents
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CMOS viruses are viruses that make themselves resident in
the CMOS . These viruses can damage the hardware of the
computer.
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Benign virus might do nothing more than display a
message.
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Malignant virus cause damage to a computer system, such
as corrupting files or destroying data.
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In the Wild virus A virus that has been found in more
than one organization or company.
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Worms instead of spreading from file to file, they spread
from computer to computer, infecting an entire system. After the
initial infection, the worm attempts to spread to other machines
on a network.
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Trojan Horse designed to cause damage or do something
malicious to a system, but are disguised as something useful.
Unlike viruses, these don't make copies of themselves.
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