1-Explain any four differences between OSI and TCP/IP models in your own words.2

1-Explain any four differences between OSI and TCP/IP models in your own words.2-If a periodic signal is decomposed into five sine waves with frequencies of 350, 450, 850, 950, and 1050 Hz, what is its bandwidth? Draw the spectrum, assuming all components have a maximum amplitude of 20 V.3-Compare recent technologies used in Guided Media and Unguided Media with Example?4-If maximum distance amongst ALOHA wireless station is 12 kilometer ? If signals propagate at 3 km/s then calculate Maximum Propagation Time and R for k=4?