An intranet is is a set of networks that are under the control of a single administrative entity.
An internetwork is the connection of multiple computer networks via a common routing technology using routers - "THE Internet" is the most obvious example of an internetwork, but you can have a campus or corporate internetwork/internet that is isolated from or connected to THE Internet.
The world wide web or the internet.
LAN
Internet
ICANN
I'd call him IT technician. Not sure on it though...
A network, or a subnet.A network, or a subnet.A network, or a subnet.A network, or a subnet.
Any device on a network is called a 'node'.
answer: node
Network Interface Cards
True
communication between the miultiple systems
The arrangement of computers in a network is known as Network topology.
A group of computers might form a network, but this is not necessarily the case. There is no commonly used collective noun for computers.
A "LAN" ... which stands for "Local Area Network". If the network is formed by a Bluetooth wireless network, it's commonly called a "PAN", or "Personal Area Network". This refers to the short distance generally between your Bluetooth devices, which may include computers, headsets, mobile phones etc.