A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. Differential PCM with 4 bit relative signal value is used. Then how many bits per second are actually sent?
A. 32 Kbps
B. 64 Kbps
C. 8 Kbps
D. 128 Kbps.
E. None of the above
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X.21 is
A. a method of determining which device has access to the transmission medium at any time
B. a method access control technique for multiple-access transmission media
C. a very common bit-oriented data link protocol issued by ISO
D. network access standard for connecting stations to a circuit-switched network
E. None of the above
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What is the minimum number of wires required for sending data over a serial communications links?
A. 2
B. 1
C. 4
D. 3
E. None of the above
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In cyclic redundancy checking, the divisor is _____ the CRC.
A. the same size as
B. one bit less than
C. one bit more than
D. two bits more
E. None of the above
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Which command-line tool is included with every Microsoft TCP/IP client?
A. DHCP
B. WINS
C. PING
D. WINIPCFG
E. None of the above
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If odd parity is used for ASCII error detection, the number of 0s per eight-bit symbol is _____.
A. even
B. odd
C. indeterminate
D. 42
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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
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Number of bits per symbol used in Baudot code is
A. 1
B. 5
C. 8
D. 9
E. None of the above
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Working of the WAN generally involves
A. telephone lines
B. microwaves
C. satellites
D. All of the above
E. None of the above
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What does the acronym ISDN stand for?
A. Indian Standard Digital Network
B. Integrated Services Digital Network
C. Intelligent Services Digital Network
D. Integrated Services Data Network
E. None of the above
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Which of the following services dynamically resolves NetBIOS-to-IP resolution?
A. DNS
B. DHCP
C. WINS
D. LMHOSTS
E. None of the above
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An example of a medium-speed, switched communications service is
A. Series 1000
B. Dataphone 50
C. DDD
D. All of the above
E. None of the above
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A devices that links two homogeneous packet-broadcast local networks, is
A. gateway
B. repeater
C. bridge
D. hub
E. None of the above
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A computer that handles resource sharing and network management in a local area network. Select the best fit for answer:
A. Network Server
B. Virtual Private Network
C. Network operating system
D. OSI
E. Three
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Repeaters are often used on an 802.3 network to help strengthen the signals being transmitted. As with the length of segments and the number of segments, a limit exists as to how many repeaters can be used between any two nodes. What is the maximum number of repeaters that can be used?
A. Five
B. Two
C. Four
D. Six
E. Three
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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 milliwatts
E. None of the above
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A modem that is attached to the telephone system by jamming the phone's handset into two flexible receptacles in the coupler?
A. gateway
B. bridge
C. acoustic coupler
D. time-division multiplexer
E. None of the above
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With telecommunications and a personal computer you can
A. "download" free public domain programs
B. send letters to be printed and delivered by the post office
C. order goods at a substantial discount
D. All of the above
E. None of the above
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Which of the following statement is correct?
A. Teleprinters are used for printing at remote locations, not for input.
B. Teleprinters are same as teletypes
C. Teleprinters are same as x400
D. Teleprinters have a printer for output and keyboard for input
E. None of the above
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What does 224 translate to in binary?
A. 11110000
B. 11110
C. 1111
D. 11100000
E. None of the above
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