LAN Switching and Wireless

41. _________ is a virtual-circuit wide-area network that was designed in response to demands for a new type of WAN in the late 1980s and early 1990s.

1. X.25
2. Frame Relay
3. ATM
4. none of the above

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42. _________ is an analog multiplexing technique to combine optical signals.

1. FDM
2. TDM
3. WDM
4. None of the above

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43. _________ is an idea or concept that is a precursor to an Internet standard.

1. RCF
2. RFC
3. ID
4. none of the above

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44. _________ is based on coding theory and uses sequences of numbers called chips.

1. FDMA
2. TDMA
3. CDMA
4. none of the above

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45. _________ is designed to be used in wireless applications in which stations must be able to share the medium without interception by an eavesdropper and without being subject to jamming from a malicious intruder.

1. Spread spectrum
2. Multiplexing
3. Modulation
4. None of the above.

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46. _________ is designed to use the high bandwidth capability of fiber-optic cable.

1. FDM
2. TDM
3. WDM
4. None of the above

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47. _________ is normally referred to as mB/nB coding; it replaces each m-bit group with an n-bit group.

1. Block coding
2. Line coding
3. Scrambling
4. None of the above

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48. _________ is suitable for businesses that require comparable upstream and downstream data rates.

1. VDSL
2. ADSL
3. SDSL
4. (a) and (b)

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49. _________ is the cell relay protocol designed by the corresponding Forum and adopted by the ITU-T.

1. X.25
2. Frame Relay
3. ATM
4. none of the above

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50. _________ is the interface between two ATM switches.

1. UNI
2. NNI
3. NNN
4. none of the above

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