Question $1$

a$)$ Computer networks are divided into several layers, for instance, ISO's OSI has seven layers, and the Internet's TCP$/$IP has only $4$ layers.

i$)$ State any $3$ reasons why the layered structure is used to describe computer networks.

$[3]$

$[3]$

b$)$ State $3$ ways of classifying computer networks.

c$)$ There are ten employees in a local estate agent's office. Each employee uses a networked PC on a Local Area Network $($LAN$).$

i$).$ Give any $2$ benefits to the Company of using a network rather than stand$-$alone PCs$.[4]$

ii$).$ Explain the difference between a LAN and a WAN.

$[4]$