Modems are electronic devices which convert digital information of computers into analog signals and are also capable of again converting the analog signals to the digital information at the receiving end....

Network topology refers to the arrangement of different devices on the network. Star, ring, mesh, tree and hybrid are main topologies in context to a computer network.

A database is basically a repository of data which is devised in order to support efficient data storage. In addition to data storage, a database also assists in retrieval and maintenance of data stored in it...

In database systems like SQL Server, Char and Varchar are both datatypes, where char actually refers to character and Varchar refers to variable character. They both are used to store string type of values...

Cryptography is the art of hiding messages by converting them into hidden texts. It is generally done in order to transmit a message over insecure channels. On the other hand, cryptanalysis is the art of...