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  • Question
  • What is the minimum number of wires needed to send data over a serial communication link layer?


  • Options
  • A. 1
  • B. 2
  • C. 4
  • D. 6
  • E. none of the above

  • Correct Answer



  • Networking problems


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    • 1. Which of the following statement is incorrect?

    • Options
    • A. The CCITT Recommendation X.25 specifies three layers of communication: physical, link and network.
    • B. The second layer of communication is the data-link layer
    • C. Errors in the physical layer can be detected by the data link layer
    • D. The fourth layer, in reference to the OSI model, is the session layer
    • E. None of the above
    • Discuss
    • 2. What is the first octet range for a class B IP address?

    • Options
    • A. 128 - 255
    • B. 1 - 127
    • C. 192 - 223
    • D. 128 - 191
    • E. 127 - 191
    • Discuss
    • 3. What operates in the Data Link and the Network layer?

    • Options
    • A. NIC
    • B. Bridge
    • C. Brouter
    • D. Router
    • E. None of the above
    • Discuss
    • 4. A batch processing terminal would not include a

    • Options
    • A. CPU
    • B. card reader
    • C. card punch
    • D. line printer
    • E. None of the above
    • Discuss
    • 5. To make possible the efficient on-line servicing of many teleprocessing system users on large computer systems, designers are developing

    • Options
    • A. communication systems
    • B. multiprogramming systems
    • C. virtual storage systems
    • D. All of the above
    • E. None of the above
    • Discuss
    • 6. What is the name of the computer based EMMS that provides a common forum where users can check in at their convenience, post messages, actively exchange ideas and participate in ongoing discussions?

    • Options
    • A. E-mail
    • B. Bulletin board system (BBS)
    • C. Teleconferencing
    • D. Videoconferencing
    • E. None of the above
    • Discuss
    • 7. The network layer, in reference to the OSI model, provide

    • Options
    • 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
    • Discuss
    • 8. Error detection at a data link level is achieved by

    • Options
    • A. bit stuffing
    • B. cyclic redundancy codes
    • C. Hamming codes
    • D. equalization
    • E. None of the above
    • Discuss
    • 9. Which of the following statement is incorrect?

    • Options
    • A. Gateways are assumed to know correct routes; hosts begin with minimal routing information and learn new routes from gateways.
    • B. Layered protocols are designed so that layer n at the destination receives exactly the same object sent by layer n at the source.
    • C. Application programs as well as all protocol software from the Internet layer upward use only IP addresses; the network interface layer handles physical addresses.
    • D. All of the above
    • E. None of the above
    • Discuss
    • 10. Devices on one network can communicate with devices on another network via a

    • Options
    • A. file server
    • B. utility server
    • C. printer server
    • D. gateway
    • E. None of the above
    • Discuss


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