Lec-4: Physical layer in computer networks in hindi | Functions of Physical layer | OSI

Three engineering students were gathered together discussing the possible designers of the human body. One said, "It was a mechanical engineer. Just look at all the joints."

Another said, "No, it was an electrical engineer. The nervous system has many thousands of electrical connections."

The last said, "Actually it was a civil engineer. Who else would run a toxic waste pipeline through a recreational area?"