nic and modem installation
connectivity to the internet requires an adapter card
a modem is an electronic line it allows data transfer between one computer and another over the
public swithed telephone net work (pstn) figure 1-7 shows an example of an external modem typically modems send data in bloks of bytes after each block basic math is performed to analyze the block
figure 1-7 external modem
the term modem derives from the function of this function of this device the proess of converting digital signals to analog and back again called modulation
the nic lets hosts connect to the network the nic is considered a key component nics are available in different types depending on the individual device configuration notebook computer can have a built-in interface or use a pcmia card desktop systems can use a built-in or adapter card-type nic