| Q.1. What are the most commonly used transmission speeds in BPS used in data communication? |
|---|
| a.300 b.1200 c.2400 d.9600 |
| Answer: d |
Q.2. What is the default subnet mask for a class C network? |
| a. 127.0.0.1 b. 255.0.0.0 c. 255.255.0.0 d. 255.255.255.0 |
| Answer: d |
Q.3. Which of the following is used for modulation and demodulation? |
| a. modem b. protocols c. gateway d. multiplexer |
| Answer: a |
Q.4. Which of the following is not a disadvantage of wireless LAN? |
| a. Slower data transmission b. higher error rate c. interference of transmissions from different computers d. All of the above |
| Answer: d |
Q.5. Which of the following refers to the terms "residual error rate"? |
| a. the number of bit errors per twenty four hours of continuous operation on an asynchronous line b. The probability that one or more errors will be undetected when an error detection scheme is used c. the probability that one or more errors will be detected when an error detection mechanism is used d. signal to noise ratio divided by the ratio of energy per bit to noise per hertz |
| Answer: b |
Q.6. Which of the following summation operations is performed on the bits to check an error-detecting code? |
| a. Codec. b. Coder-decoder c. Checksum. d. Attenuation |
| Answer: d |
Q.7. Which of the following is considered a broad band communication channel? |
| a. coaxial cable b. fiber optics cable c. microwave circuits d. All of the above |
| Answer: c |
Q.8. An error-detecting code inserted as a field in a block of data to be transmitted is known as? |
| a. Frame check sequence b. Error detecting code c. Checksum d. flow control |
| Answer: a |
Q.9. The cheapest modems can transmit |
| a. 1,200 bits per second b. 300 bits per second c. 2,400 bits per second d. 4,800 bits per second |
| Answer: b |
Q.. Which network topology is considered passive? |
| a. Cross b. Bus c. Star d. Ring |
| Answer: b |
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