What is a Computer Virus ? A potentially damaging computer programme capable of reproducing itself causing great harm to files or other programs without permission or knowledge of the user. Types of viruses :- The different types of viruses are as follows- 1) Boot Sector Virus :- Boot sector viruses infect either the master boot record of the hard disk or the floppy drive. The boot record program responsible for the booting of operating system is replaced by the virus. The virus either copies the master boot program to another part of the hard disk or overwrites it. They infect a computer when it boots up or when it accesses the infected floppy disk in the floppy drive. i.e. Once a system is infected with a boot-sector virus, any non-write-protected disk ac...
Follow the steps given below :- 1) Hold down the 'Windows' Key and Press the 'Pause/Break' button at the top right of your keyboard. Another way is Right-Clicking 'My Computer' and then Select 'Properties'. 2) Click on the 'Advanced' tab. 3) Under 'Performance', click 'Settings'. 4) Then click the 'Advanced' tab on the button that pops up. 5) Under 'Virtual Memory' at the bottom, click 'Change'. 6) Click the 'Custom Size' button. 7) For the initial size (depending on your HD space), type in anywhere from 1000-1500 (although I use 4000), and for the Maximum size type in anywhere from 2000-2500 (although I use 6000). 8) Click 'Set...
A denial of service (DoS) attack is an attack that clogs up so much memory on the target system that it can not serve it's users, or it causes the target system to crash, reboot, or otherwise deny services to legitimate users.There are several different kinds of dos attacks as discussed below:- 1) Ping Of Death :- The ping of death attack sends oversized ICMP datagrams (encapsulated in IP packets) to the victim.The Ping command makes use of the ICMP echo request and echo reply messages and it's commonly used to determine whether the remote host is alive. In a ping of death attack, however, ping causes the remote system to hang, reboot or crash. To do so the attacker uses, the ping command in conjuction with -l argument (used to specify the size of the packet sent) to ping the target system that exceeds the maximum bytes allowed by TCP/IP (65,536). example:- c:/>ping -l 65540 h...
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