Demonstration of the functioning of Network Devices

What is DNS?
Modulator and demodulator as combined is known as __________.
In which topology, 'All hosts are connected to a central device, known as hub device, using a point-to-point connection'?
The switch needs ________ address to forward the data.
Which of the following is not a type of bridge?
A device that provides a central connection point for cables is?
A device that is used to connect a number of LANs is?
How many layers does the OSI Reference Model have?
Which one of the following network devices transmits the data in the form of packets?
___________ is an example of half-duplex data flow.