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DATACOM TEST 3
Physical layer.
| Question | Answer |
|---|---|
| Data is physically transmitted from one computer or terminal to another in the what layer? | Physical |
| ___ refers to the transmission caracteristics of the circuit. | Logical circuit |
| The two fundamentally different types of data are: | Digital and analog. |
| Which of the following is not a key advantage of digital trasmission. | It permits only low transmission rates. |
| _____ is the basic physical layout of the circuit. | Circuit configuration. |
| A ____ circuit is another name for a multipoint configuration. | Shared circuit |
| Which is not true about point to point circuits? | Point to point circuits reduce the amount of cable required and use the circuit more efficiently than multipoint circuits. |
| The ability to transmit in both directions but only in one direction at a time is an example of ___ transmission | half duplex |
| The two basic types of media are | guided and wireless |
| which of the following would be considered a type of wireless media | microwave |
| The type of media usually installed on homes and businesses by the telephone company is called | twisted pair |
| The earliest type of fiber optic systems were | Multimode |
| Another term for the weakening of a signal over distance is | attenuation |
| ___ refers to the spreading of the signal that different parts of the signal arrive at different times at the destination. | Dispersion |
| Which media can best withstand harsh environmental conditions? | Fiber optic cable |
| ___ Transmission is prone to interference from smoke, heavy rain and fog requires line of sight. | Infrared |
| Microwave transmission: | Is a type of high frequency radio communication, requires a clear line-of-sight path, is typically used for long distance data transmission, , and does not require the laying of any cable |
| __ refers to the time it takes for a signal to travel from sender to recipient, (highly exaggerated with sattelite transmissions) | Propagation delay |
| which of the following media has the lowest error rates and the highest transmission speeds. | Fiber optic cable |
| Transmission speeds differ: | widely among media |
| A coding scheme that uses 10 bits to represent each character is capable of representing ___ different characters. | 1024 |
| ___ is one of the most commonly used coding chemes used in data transmissions | ASCII |
| The representation of the character a by the group of 8 bits, 01000001, is an example of | digital coding |
| when all bits of a character are transferred one after another, the bits are transferred in ____ mode | serial |
| which of the following statements is correct? | serial transmission is slower than parallel transmission |
| ___ is not a type of digital signaling technique | data rate signaling (type of signaling, unipolar, non return to zero, manchester, return to zero. |
| with which type of digital signaling does the signal always return to zero volts after each bit | return to zero signaling |
| which type of digital signaling would experience fewer errors because it has more distinct signals |
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