In which layer of the TCPNP layers is router or packet switch mainly used? Appilication layer Host-to-host, or transport layer Internet layer Notwork access layer Physical layer QUESTION 3 Everying else being equal, what can we say about frequency and wavelength? None The higher is the frequency, the larger is the wavelenght The unit for both frequency and wavelength is Hz The higher is the frequency, the smaller is the wavelenght Frequency has no effect on wavelength