The minimum number of columns in a datagram network is two; the minimum number of columns in a virtual-circuit network is four. Can you explain the reason? Is the difference related to the type of addresses carried in the packets of each network?

In computing, a "bus" is a group of interconnected wires that carry information between nodes. Depending on circumstances, the bus might be operating in either direction. To further understand this phenomenon or notion, please provide an illustration utilizing the existing bus fleet.

SMP (Symmetric Multiprocessing) is defined as, what exactly?

What is the significance of "time synchronization" in the OSI model, and which layer primarily deals with it?

Describe how "multiplexing" and "demultiplexing" operations occur in the OSI model.