| 21. | Find the false statement: |
| a. | In modern Cryptography, symmetric key algorithms use same key both for Encryption and Decryption |
| b. | The symmetric cipher DES (Data Encryption Standard) was widely used in the industry for security product |
| c. | The AES (Advanced Encryption Standard ) cryptosystem allows variable key lengths of size 56 bits and 124 bits |
| d. | Pubiic key algorithms use two different keys for Encryption and Decryption |
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Answer: (c).The AES (Advanced Encryption Standard ) cryptosystem allows variable key lengths of size 56 bits and 124 bits
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| 22. | The message 11001001 is to be transmitted using the CRC polynomial x3 +1 to protect it from errors. The message that should be transmitted is : |
| a. | 110010011001 |
| b. | 11001001 |
| c. | 110010011001001 |
| d. | 11001001011 |
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|
Answer: (d).11001001011
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| 23. | What is the bit rate for transmitting uncompressed 800 x 600 pixel colour frames with 8 bits/pixel at 40 frames/second? |
| a. | 2.4 Mbps |
| b. | 15.36 Mbps |
| c. | 153.6 Mbps |
| d. | 1536 Mbps |
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|
Answer: (c).153.6 Mbps
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| 24. | In IPV 4, the IP address 200.200.200.200 belongs to |
| a. | Class A |
| b. | Class B |
| c. | Class C |
| d. | Class D |
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|
Answer: (c).Class C
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| 25. | Which layer of OSI reference model is responsible for decomposition of messages and generation of sequence numbers to 'ensure correct re-composition from end to end of the network?' |
| a. | Physical |
| b. | Data-link |
| c. | Transport |
| d. | Application |
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Answer: (c).Transport
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| 26. | A client-server system uses a satellite network, With the satellite at a height of 40,000 kms. What is the best-case delay in response to a request (Note that the speed of light in air is 3,00,000 km/second). |
| a. | 133.33 m sec |
| b. | 266.67 m sec |
| c. | 400.00 m sec |
| d. | 533.33 m sec |
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Answer: (b).266.67 m sec
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| 27. | The start and stop bits are used in serial communication for |
| a. | error detection |
| b. | error correction |
| c. | synchronization |
| d. | slowing down the communication |
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Answer: (c).synchronization
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| 28. | ___________ is a type of transmission impairment in which the SIgnal looses strength due to The resistance of the transmission medium. |
| a. | Attenuation |
| b. | Distortion |
| c. | Noise |
| d. | Decible |
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Answer: (a).Attenuation
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| 29. | Match the following : List - I List - II a. Call control protocol i. Interface between Base Transceiver Station (BTS) and Base Station Controller (BSC) b. A-bis ii. Spread spectrum c. BSMAP iii. Connection management d. CDMA iv. Works between Mobile Switching Centre (MSC) and Base Station Subsystem (BSS) Code: a b c d |
| a. | iii iv i ii |
| b. | iii i iv ii |
| c. | i ii iii iv |
| d. | iv iii ii i |
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Answer: (d).iv iii ii i
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| 30. | An analog signal has a bit rate of 6000 bps and a baud rate of 2000 baud. How many data elements are carried by each signal element? |
| a. | 0.336 bits baud |
| b. | 3 bits baud |
| c. | 120,00,000 bits baud |
| d. | None of the above |
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Answer: (b).3 bits baud
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