| Q.1. Which of the following is a voiceband channel? |
|---|
| a.Telephone line b.Telegraph line c.Coaxial cable d.Microwave systems |
| Answer: a |
Q.2. How much power (roughly) a light emitting diode can couple into an optical fiber? |
| a. 100 microwatts b. 440 microwatts c. 100 picowatts d. 10 miliwatts |
| Answer: a |
Q.3. The synchronous modems are more costly than the asynchronous modems because |
| a. they produce large volume of data b. they contain clock recovery circuits c. they transmit the data with stop and start bits d. they operate with a larger bandwidth |
| Answer: b |
Q.4. Which of the following statement is correct? |
| a. terminal section of a synchronous modem contains the scrambler b. receiver section of a synchronous modem contains the scrambler c. transmission section of a synchronous modem contains the scrambler d. control section of a synchronous modem contains the scrambler |
| Answer: c |
Q.5. In a synchronous modem, the digital-to-analog converter transmits signal to the |
| a. equilizer b. modulator c. demodulator d. terminal |
| Answer: a |
Q.6. Which of the following communications lines is best suited to interactive processing applications? |
| a. narrow band channel. b. simplex lines. c. full duplex lines. d. mixed band channels. |
| Answer: c |
Q.7. Contention is |
| a. One or more conductors that serve as a common connection for a related group of devices b. a continuous frequency capable of being modulated or impressed with a second signal c. the condition when two or more stations attempt to use the same channel at the same time d. a collection of interconnected functional units that provides a data communications service among stations attached to the network |
| Answer: c |
Q.8. Avalanche photodiode receivers can detect hits of transmitted data by receiving |
| a. 100 photons b. 300 photons c. 400 photons d. 200 photons |
| Answer: d |
Q.9. Satellite-Switched Time-Division Multiple Access (SS/TDMA) is |
| a. the method of determining which device has access to the transmission medium at any time b. a medium access control technique for multiple access transmission media c. a form of TDMA in which circuit switching is used to dynamically change the channel assignments d. All of the above |
| Answer: c |
Q.10.When you ping the loopback address, a packet is sent where: |
| a. On the network b. Down through the layers of the IP architecture and then up the layers again c.Across the wire d. through the loopback dongle |
| Answer: b |
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