Test Exam Questions and Answers for Data Communications And Computer Networks Already Passed

Test Exam Questions and Answers for Data Communications And Computer Networks Already Passed twisted pair is the least quality twisted pair wire that should be used in a data/voice application - Answers Category 1 The first PCS technology uses a form of time division multiplexing called - Answers Time Division Multiple Access (TDMA) Which type of satellite remains located over the same point of earth at all times - Answers GEO cable is virtually impossible to wiretap - Answers Fiber-optic twisted pair is designed to support data transmission with signals as high as 200 MHz for 100 meters. - Answers Category 6 cable is a thin glass cable, a little thicker than a human hair, surrounded by a plastic coating - Answers Fiber-optic The ____ system is an example of a single-user Earth station satellite system with its own ground station and a small antenna (two to six feet across) - Answers VSAT satellites are closest to the Earth - Answers Low-Earth-orbit (LEO) The popular GPS devices that people use to find directions while driving use which type of satellite system - Answers MEO satellites can be found roughly 1000 to 3000 miles from the Earth - Answers Middle-Earth-orbit (MEO) transmission means that to receive and transmit a signal, each antenna must be in sight of the next antenna - Answers Line-of-sight twisted pair was designed to transmit 20 Mbps of data for distances up to 100 meters - Answers Category 4 systems transmit data over a wide range of frequencies rather than limiting transmissions to a narrow, fixed band of frequencies - Answers Ultra-wideband technology uses digital signaling in which the cable carries only one channel of digital data - Answers Baseband coaxial When a light signal inside the cable bounces off the cable wall and back into the cable, this is called - Answers reflection cable is approximately 4 mm (less than 1/4 inch) in diameter - Answers Thin coaxial A recently publicized satellite system that has unique properties is the ____ satellite, which is used by governments for spying and by scientific agencies for observing celestial bodies - Answers Highly-elliptical-Earth-orbit (HEO) The ____ cable is similar to fiber-optic cable in that it is as thin as a hair and transparent. The big difference, however, is that this new cable is full of holes - Answers photonic fiber The transmission time from when a signal first leaves a satellite and then arrives at a ground station is called - Answers propagation delay The third PCS technology is ____ and uses a different form of time division multiple access technology - Answers Global System for Mobile (GSM) Communications Cells, in a cellular telephone system, can range in size from one-half mile in radius to ____ miles in radius - Answers 50 As the length of a glass cable grows, the light signal attenuates due to reflection and - Answers refraction cable ranges in size from approximately 6 to 10 mm or more (1/4 to 3/8 inch) in diameter - Answers Thick coaxial transmission systems transmit tightly focused beams of radio signals from one ground-based microwave transmission antenna to another - Answers Terrestrial microwave is the designation for a digital telephone circuit that transmits voice or data at 1.544 Mbps -