1. which of the following is keyed a connector, often used with CATS and CAT6 cables? A. RBC49 B. UTC Typle B C. Jack D. RJ45 2.whenever you have multiple devices, over a network, what is the solution to the problem of how to connect them to make one-to-one communication possible? A. Wavelength-division B. Major frequency C. switching D. modulation 3.which of the following transmission media class is unguided A. fiber-optic cable B. infrared C. coaxial cable D. twisted-pair 4.which of the following is not a signal transmission fiber A. image mode index B. multimode, step index C. single mode D. multiple, graded index 5.a network in which data flows in both directions all the time is known as A. full-duplex B. simplex C. complex D. half-duplex