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| 1 | |
The largest portion of the bandwidth for ADSL carries _______. |
| | A) | voice communication |
| | B) | upstream data |
| | C) | downstream data |
| | D) | control data |
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| 2 | |
Another name for the cable TV office is the _______. |
| | A) | splitter |
| | B) | fiber node |
| | C) | combiner |
| | D) | head end |
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| 3 | |
A traditional cable TV network transmits signals ______. |
| | A) | upstream |
| | B) | downstream |
| | C) | upstream and downstream |
| | D) | None of the choices are correct |
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| 4 | |
The original telephone network, which is referred to as the plain old telephone system (POTS), was a (an) ________ system. |
| | A) | digital |
| | B) | analog |
| | C) | digital as well as analog |
| | D) | None of the choices are correct |
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| 5 | |
The traditional cable TV system used ________cable end to end. |
| | A) | twisted-pair |
| | B) | coaxial |
| | C) | fiber-optic |
| | D) | None of the choices are correct |
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| 6 | |
The second generation of cable networks is called a(n) _________ network. |
| | A) | HFC |
| | B) | HCF |
| | C) | CFH |
| | D) | None of the choices are correct |
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| 7 | |
The HFC network uses _______ cable. |
| | A) | twisted-pair |
| | B) | coaxial |
| | C) | fiber-optic |
| | D) | a combination of coaxial and fiber-optic |
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| 8 | |
To use a cable network for data transmission, we need two key devices: a ______ and a _________ |
| | A) | CM; CMS |
| | B) | CT; CMTS |
| | C) | CM; CMTS |
| | D) | None of the choices are correct |
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| 9 | |
A (An) ______ signal is the corresponding optical signals of an electrical signal level STS-n. |
| | A) | OC-n |
| | B) | TDM-n |
| | C) | FDM-n |
| | D) | None of the choices are correct |
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| 10 | |
SONET uses _______ TDM multiplexing. |
| | A) | asynchronous |
| | B) | synchronous |
| | C) | statistical |
| | D) | None of the choices are correct |
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| 11 | |
A SONET system can use _________. |
| | A) | STS multiplexers |
| | B) | regenerators |
| | C) | add/drop multiplexers |
| | D) | All of the choices are correct |
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| 12 | |
SONET sends ________ frames per second. |
| | A) | 1000 |
| | B) | 2000 |
| | C) | 4000 |
| | D) | 8000 |
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| 13 | |
In SONET, __________ allow insertion and extraction of signals. |
| | A) | regenerators |
| | B) | ADMs |
| | C) | STS multiplexer/demultiplexers |
| | D) | None of the choices are correct |
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| 14 | |
In SONET, for each byte, the bits are transmitted ____________. |
| | A) | from least significant to the most significant |
| | B) | from most significant to the least significant |
| | C) | two at a time |
| | D) | three at a time |
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| 15 | |
________ is the cell relay protocol designed by the corresponding Forum and adopted by the ITU-T. |
| | A) | SONET |
| | B) | ADM |
| | C) | ATM |
| | D) | None of the choices are correct |
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| 16 | |
The ATM standard defines ______ layers. |
| | A) | two |
| | B) | three |
| | C) | four |
| | D) | five |
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| 17 | |
An ATM data unit is a cell composed of ______ bytes. |
| | A) | 40 |
| | B) | 50 |
| | C) | 52 |
| | D) | 53 |
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| 18 | |
In ATM, a(n) ______ is the interface between a user and an ATM switch. |
| | A) | UNI |
| | B) | NNI |
| | C) | NUI |
| | D) | None of the choices are correct |
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| 19 | |
In ATM, a(n) _________ is the interface between two ATM switches. |
| | A) | UNI |
| | B) | NNI |
| | C) | NUI |
| | D) | None of the choices are correct |
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| 20 | |
In ATM, the _______layer accepts transmissions from upper-layer services and maps them into cells. |
| | A) | physical |
| | B) | ATM |
| | C) | AAL |
| | D) | None of the choices are correct |
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| 21 | |
In ATM, the ______ layer provides routing, traffic management, switching, and multiplexing services. |
| | A) | physical |
| | B) | ATM |
| | C) | AAL |
| | D) | None of the choices are correct |
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| 22 | |
In SONET, a ________ is a repeater. |
| | A) | regenerator |
| | B) | ADM |
| | C) | STS multiplexer/demultiplexer |
| | D) | None of the choices are correct |
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