15. Which of the following is the most popular LAN topology? bus Tree Wireless star-wired bus 17. _____ signaling is used in a bus network and uses a digital signal. Biband Star Broadband Baseband 18. A hub operates at the_________. network layer of OSI model physical layer of OSI model transport layer of OSI model data link layer of OSI model 19. With the increased use of _____, errors occur less frequently. shielded twisted pair cables wireless media Microwave fiber-optic cables

20.

The wireless LAN term for a collection of multiple Basic Service Sets is ____.

	Basic Service Set (BSS)
	Extended Service Set (ESS)
	Multiple Service Set (MSS)
	Complex Service Set (CSS)