Distributed Queue Dual Bus is a standard for
A. LAN
B. MAN
C. WAN
D. Wireless LAN
E. LAN and MAN
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A teleprocessing system may consist of
A. user systems
B. communications systems
C. computer center systems
D. All of the above
E. None of the above
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If the ASCII character G is sent and the character D is received, what type of error is this?
A. single-bit
B. multiple-bit
C. burst
D. recoverable
E. None of the above
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Which layer of OSI determines the interface of the system with the user?
A. Network
B. Application
C. Data-link
D. Session
E. None of the above
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The transfer of data from a CPU to peripheral devices of a computer is achieved through
A. modems
B. computer ports
C. interfaces
D. buffer memory
E. None of the above
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What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?
A. 4
B. 2
C. 6
D. 3
E. None of the above
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Many data communication networks have been established which provide a wealth of on-demand information services to people at home. What is the name of the system which provides an interactive, graphics-rich service that permits user to select what they want?
A. Teletex system
B. Fax system
C. Videotex system
D. Microwave system
E. None of the above
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Which of the following statements is correct?
A. Terminal section of a synchronous modem contains the scrambler
B. Receiver section of a synchronous modem contains the scrambler
C. Transmission section of a synchronous modem contains the scrambler
D. Control section of a synchronous modem contains the scrambler
E. None of the above
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Which of the following characteristic(s) is/are suited to the PSS applications?
A. bursty traffic and low communications intensity
B. widely dispersed terminals and access to international packets switched services
C. Multiple remote host or applications accessed by a single local access circuit terminal and circuit
D. All of the above
E. None of the above
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Because the configuration infor-mation for a DHCP client is received dynamically, you must use which utility to read the current configuration to verify the settings?
A. PING
B. TRACERT
C. ARP
D. IPCONFIG
E. None of the above
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Which of the following is separated by a subnet mask?
A. DHCP scopes
B. Network ID and host ID
C. Domains
D. Subnets
E. None of the above
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The signal to noise ratio for a voice grade line is 30.1 dB (decibels) or a power ratio of 1023:1. The maximum achievable data rate on this line whose spectrum ranges from 300 Hz to 4300 Hz is
A. 6200 bps
B. 9600 bps
C. 34000 bps
D. 31000 bps
E. None of the above
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TCP is:
A. Operates at the Data Link layer
B. Connection orientated and unreliable
C. Connection orientated and reliable
D. Connectionless and unreliable
E. None of the above
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An encyclopedic database
A. is an information utility that specializes in storing and searching information
B. is generally free
C. is easy for beginners to use
D. All of the above
E. None of the above
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Which of the following statements is correct?
A. Protocol converters are the same as multiplexers
B. Protocol converters are the same as TDMs
C. Protocol converters are usually not operated in pairs.
D. Protocol converters are usually operated in
E. None of the above
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The dialogue techniques for terminal use do not include
A. questions and answers
B. open-ended questions
C. form fillings
D. menu display
E. None of the above
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You have a network ID of 192.168.10.0 and require at least 25 host IDs for each subnet, with the largest amount of subnets available. Which subnet mask should you assign?
A. 255.255.255.192
B. 255.255.255.224
C. 255.255.255.240
D. 255.255.255.248
E. 255.255.255.255
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The encoding method specified in the EIA-232 standard is _____.
A. NRZ-I
B. NRZ-L
C. Manchester
D. Differential Manchester
E. None of the above
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Examples are packet switching using frame relay, and cell switching using ATM technologies. Select the best fit for answer:
A. Bandwidth alternatives
B. Switching alternating
C. Inter organizational networks
D. Extranets
E. None of the above
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The physical layer, in reference to the OSI model, defines
A. data link procedures that provide for the exchange of data via frames that can be sent and received
B. the interface between the X.25 network and packet mode device
C. the virtual circuit interface to packet-switched service
D. All of the above
E. None of the above
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