3.1-3.2 - Circuits and Communication Media

Question 1

A ___________ is a discrete (specific) path between two or more points along which signals can be carried

Answer 1

circuit

Question 2

Circuit configuration is the basic physical layout of the circuit

Answer 2

1. Point-to-point
2. Multipoint

Question 3

Sometimes called dedicated circuits; one computer to another

Answer 3

Point-to-point Circuit

Question 4

Used when the computers generate enough data to fill the capacity of the communication circuit

Answer 4

Point-to-point Circuit

Question 5

Also called shared circuit; many computers are connected to the same circuit

Answer 5

Multipoint Circuit

Question 6

Typically used when each PC does not need to continuously use the entire capacity of the circuit

Answer 6

Multipoint Circuit

Question 7

Data flow in circuits are also known as _______________

Answer 7

transmission nodes

Question 8

A one-way transmission, such that radios or tv sets

Answer 8

Simplex Transmission

Question 9

Devices in this transmission mode can only take one of two device roles:

Answer 9

1. A transmitter (sender)
2. A receiver

Question 10

A two-way transmission, but you can transmit in only one direction at a time — similar to a walkie-talkie

Answer 10

Half-duplex Transmission

Question 11

Computers use _______________ to negotiate that they will send and receive data

Answer 11

control signals

Question 12

The amount of time half-duplex communication takes to switch between sending and receiving is called _______________ (or retrain time, relocking time)

Answer 12

turnaround time

Question 13

You can transit in both direction simultaneously

Answer 13

Full-duplex Transmission

Question 14

Devices in this mode of transmission are capable of transmitting and receiving data, thus, they are sometimes referred to as _______________

Answer 14

transceivers

Question 15

To break one high-speed physical communication circuit into several lower-speed logical circuits; often done in multiples of 4

Answer 15

Multiplexing

Question 16

Can be described as dividing the circuit “horizontally” so that many signals can travel a single communication circuit simultaneously

Answer 16

Frequency Division Multiplexing (FDM)

Question 17

Shares a communication circuit among two or more computers by having them take turns, dividing the circuit vertically, so to speak

Answer 17

Time Division Multiplexing (TDM)

Question 18

The exception to the rule that the capacity of the multiplexed circuit must equal the sum of the circuits combined

Answer 18

Statistical Time Division Multiplexing (STDM)

Question 19

Allows more terminals to be connected to a circuit than does FDM or TDM

Answer 19

Statistical Time Division Multiplexing (STDM)

Question 20

A version of FDM used in fiber-optic cables

Answer 20

Wavelength Division Multiplexing

Question 21

Many types of transmission media are currently in use:

Answer 21

1. Copper (wire)
2. Glass or plastic (fiber-optic cable)
3. Air (radio, microwave, or satellite)

Question 22

Guided Media:

Answer 22

1. Twisted pair wire
2. Coaxial cable
3. Fiber-optic cable

Question 23

Wireless Media:

Answer 23

1. Microwave
2. Satellite

Question 24

Wires are twisted to minimize electromagnetic interference (EMI)

Answer 24

Twisted Pair Cable

Question 25

Has a copper core (the inner conductor) and the outer shield (second conductor)

Answer 25

Coaxial Cable

Question 26

Uses high-speed streams of light pulses from lasers or LEDs (light-emitting diode) that carry information inside hair-thin strands of glass called optic fibers

Answer 26

Fiber Optic Cable

Question 27

Each device/computer in the network has a radio transmitter/receiver (transceiver) that uses a specific frequency range that does not interfere with commercial radio stations

Answer 27

Radio Transmission

Question 28

Extremely high-frequency radio communication beam that is transmitted over a direct line-of-sight between any two points

Answer 28

Microwave Transmission

Question 29

A _______________ satellite remains stationary over one point on the earth

Answer 29

geosynchronous

Question 30

A disadvantage of satellite tran