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
Ans . C
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
Ans . B
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
Ans . C
Q.114 Communications protocols always have a ….
(A) set of symbols
(B) the start of header
(C) the special Flag symbol
(D) BCC
Ans . A
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
Ans . D
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
Ans . D
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
Ans . C
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
Ans . C
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’
Ans . B
Q.120 An example of a sliding windows protocol is….
(A) XMODEM
(B) YMODEM
(C) YMODEM-G
(D) WXMODEM
Ans . D
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