Multiple Choice Questions for Data Communication and Networking

Selective Data Communication and Networking Questions and Answers:

Q.111 In the current frequency assignments, how many frequency bands are there for the uplink frequencies?

(A) 16

(B) 8

(C) 4

(D) 2

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Q.112 The bandwidth required to send 132 voice-grade channels by FDM on an international satellite system is….

(A) 500 MHz

(B) 10 MHz

(C) 1320 MHz

(D) 50 MHz

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Q.113 The capability to provide consumers with video-on-demand.

(A) will-occur by the year 2000.

(B) depends on the results of field trials

(C) is based on fiber to the home

(D) is based on the use of satellites

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Q.114 Communications protocols always have a ….

(A) set of symbols

(B) the start of header

(C) the special Flag symbol

(D) BCC

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Q.115 In the X MODEM protocol, the sender waits for what character from the receiver before beginning transmission?

(A) WACK

(B) ACK

(C) RVL

(D) NAK

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Q.116 If each character in an X MODEM block has an ASC II value of 50, what would be the value of the checksum added to the block?

(A) 50

(B) 23

(C) 41

(D) 25

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Q.117 Under the Y MODEM protocol, block 0 is used to transport.

(A) error-recovery information

(B) 100 characters

(C) information about the file to be transferred

(D) 64 characters

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Q.118 The second Y MODEM block used to transport an 1100-byte file would use data field of…

(A) 1024 characters

(B) 100 characters

(C) 128 characters

(D) 64 characters

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Q.119 A streaming protocol….

(A) provides error detection

(B) does not provide error detection

(C) uses 64-byte blocks

(D) requires a manual setup’

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Q.120 An example of a sliding windows protocol is….

(A) XMODEM

(B) YMODEM

(C) YMODEM-G

(D) WXMODEM

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