Symmetric Encryption

 " Data format changed using a secret key and can be decrypted only with this secret key receiver must have the secret key for decrypt message. Symmetric Encryption. " 

Symmetric encryption is the oldest and best-known technique. A secret key, which can be a number, a word, or just a string of random letters, is applied to the text of a message to change the content in a particular way. This might be as simple as shifting each letter by a number of places in the alphabet. As long as both sender and recipient know the secret key,

Bridge : Computer Network

  " Bridge is May be a combination of hardware and software or individual is used to connect two segment of same LAN (Same IP Domain). Bridge decreases the network traffic and also used to connect two different platform LANs like UNIX and Windows. " 

    A network bridge is software or hardware that connects two or more networks so that they can communicate.

    People with home or small office networks generally use a bridge when they have different types of networks but they want to exchange information or share files among all of the computers on those networks.

     Here's an example. Let's say you have two networks: in one, the computers are connected with cables; and in the other, the computers are connected using wireless technology. The wired computers can only communicate with other wired computers, and the wireless computers can only communicate with other wireless computers. With a network bridge, all of the computers can communicate with each other.

Reading PHP and MySQL a Single Value from a table

When you want to read a single value from a MySQL table following code will help you.

Your need to fetch row using query function with following syntax

     [connection_object]->query(sql statement)

After fetched rows use mysqli_fetch_assoc function for access row by row records
 

    Var_name= mysqli_fetch_assoc([connection_object]->query(SQL Statement))

mysqli_fetch_assoc returns one dimensional array so use can use table column name as index

What is cable Modem

" Simply Dish cable connection to homes "

A cable modem is used in homes for cable services provide by the service provider.Coaxial cable is used to connect our home to cable operator office a modem is attached with television, which convert analog signal to digital signal Vice-Versa.