What are sniffers in networking?

Sniffers monitor network data. A sniffer can be a self contained software program or a hardware device with the appropriate software or firmware programming. Sniffers usually act as network probes or "snoops." They examine network traffic, making a copy of the data without redirecting or altering it. Some sniffers work only with TCP/IP packets, but the more sophisticated tools can work with many other protocols and at lower levels including Ethernet frames. here is a simple figure of network cable.

Sniffers were tools used exclusively by network engineers. Today, however, these utilities have become popular on the Internet with hackers and the merely curious. The U.S. Federal Bureau of Investigation (FBI) has utilized a famous sniffer system called "Carnivore" to help detect illegal Internet communications.

The below figure shows the process of network sniffing:

How to write a bach file or a batch job?

If your are connected with world of programming, you might have heard this word " Batch File ". A batch file is used to execute a no of operations or a list of commands one after the other often requiring no user input. A no of operations are batched in a file to be executed sequentially when we run that file. In Microsoft Windows Operating system a batch file is a file saved with .bat extension while in other operating systems like Unix and Linux it can be written as a command file shell script. Batch files are often used to load programs, run multiple processes at a time, and perform common or repetitive tasks. For example, a batch job could be used to back up many files on a computer system, process log files, run a series of calculation commands, run multiple system diagnostic processes, or any number of other things that require multiple commands to be run. A big advantage of a batch job is that it can be started at any time and left alone until t...

Adding Password to Microsoft Word Document

Recovering Deleted Files, Pictures & Videos

So many times we accidently delete some important files, pictures or videos. Sometimes we loose files because of unexpected system failure ( ultimately causing system format). We can get our deleted files back using Recovery Softwares/Utilities. Even though a file was deleted there is a good chance that contents of the file are still around. When a file is deleted the contents of the file are not removed. Only a pointer to the file in the file system table is deleted. It is very important to immediately stop writing to the storage device that previously contained your files/pictures so that the old file contents are not overwritten. For example, don’t take any more pictures with your digital camera because new pictures will overwrite the deleted files. HOW TO RECOVER DELETED FILES???? Step1: You will need to use a utility to recover your lost files. I like to use a free ut...

Computer Tweaks

Search This Blog