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MCITP MCSE : Security Specialist Network connection   Is the correct user name and password being used Are the proper protocols installed Are network cables loose, damaged, connected or to long 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   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. FAT Virus infects the File Allocation Table of a hard drive, these usually cause a loss of files that are on a hard drive. Memory viruses are viruses that execute and stay resident in memory. Macro viruses are viruses that attach themselves to documents in the form of macros. Usually in Microsoft Word and Microsoft Excel documents CMOS viruses are viruses that make themselves resident in the CMOS . These viruses can damage the hardware of the computer. Benign virus might do nothing more than display a message. Malignant virus cause damage to a computer system, such as corrupting files or destroying data. In the Wild virus A virus that has been found in more than one organization or company. 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. 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.