Complex sentence: A dumb network, by design, have few or no network protocols and is not sensitive to the transmission needs of any applications; indeed, a dumb network is completely oblivious to the transmission needs of, or the number of applications that run on it.
Split into simpler sentences: A dumb network, by design, is not sensitive to the transmission needs of any applications. Indeed, a dumb network is completely oblivious to the transmission needs of, or the number of applications that run on it.