Computer Science and Networking Questions & Answers - Set 19 - ObjectiveBooks

Computer Science and Networking Questions & Answers - Set 19

Practice Test: Question Set - 19

1. A modulator converts a ______ signal to a(n) ______ signal.
    (A) FSK; PSK
    (B) PSK; FSK
    (C) Analog; digital
    (D) Digital; analog

2. A front-end processor is
    (A) A user computer system
    (B) A processor in a large-scale computer that executes operating system instructions
    (C) A minicomputer that relieves main-frame computers at a computer centre of communications control functions
    (D) Preliminary processor of batch jobs

3. A hard copy would be prepared on a
    (A) Typewriter terminal
    (B) Line printer
    (C) Plotter
    (D) All of the above

4. What is the loopback address?

5. The Internet Control Message Protocol (ICMP)
    (A) Allows gateways to send error a control messages to other gateways or hosts
    (B) Provides communication between the Internet Protocol Software on one machine and the Internet Protocol Software on another
    (C) Reports error conditions to the original source, the source must relate errors to individual application programs and take action to correct the problem
    (D) All of the above

6. When using the loopback address, if TCP/IP is installed correctly, when should you receive a response?
    (A) Immediately
    (B) Only if the address fails
    (C) After the next host comes online
    (D) Within two minutes

7. How many OSI layers are covered in the X.25 standard?
    (A) Two
    (B) Three
    (C) Seven
    (D) Six

8. The _______ houses the switches in token ring.
    (A) Transceiver
    (B) Nine-pin connector
    (C) MAU
    (D) NIC

9. Which of the following statements is incorrect?
    (A) Multiplexers are designed to accept data from several I/O devices and transmit a unified stream of data on one communication line
    (B) HDLC is a standard synchronous communication protocol
    (C) RTS/CTS is the way the DTE indicates that it is ready to transmit data and the way the DCE indicates that it is ready to accept data
    (D) RTS/CTS is the way the terminal indicates ringing

10. Which of the following medium is used for broadband local networks?
    (A) Coaxial cable
    (B) Optic fiber
    (C) CATV
    (D) UTP

11. Satellite-Switched Time-Division Multiple Access (SS/TDMA) is
    (A) The method of determining which device has access to the transmission medium at any time
    (B) A medium access control technique for multiple access transmission media
    (C) A form of TDMA in which circuit switching is used to dynamically change the channel assignments
    (D) All of the above

12. You are trying to decide which type of network you will use at your office, and you want the type that will provide communication and avoid collisions on the cable. Which of the following is the best choice?
    (A) Token-Ring
    (B) CSMA/CD
    (C) Ethernet
    (D) CSMA/CA

13. The basic Ethernet design does not provide
    (A) Access control
    (B) Addressing
    (C) Automatic retransmission of a message
    (D) Multiple virtual networks

14. To connect a computer with a device in the same room, you might be likely to use
    (A) A coaxial cable
    (B) A dedicated line
    (C) A ground station
    (D) All of the above

15. Error control is needed at the transport layer because of potential errors occurring _______.
    (A) From transmission line noise
    (B) In routers
    (C) From out-of-sequence delivery
    (D) From packet losses

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