Communication Systems Revision Set 2

10 Questions | Total Attempts: 117

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Communication System Quizzes & Trivia

Aids in testing your knowledge of measurements of speed and error checking methods


Questions and Answers
  • 1. 
    The number of signal events occurring each second is known as the: 
    • A. 

      Bits per second

    • B. 

      Bandwidth

    • C. 

      Baud rate

    • D. 

      Modulation scheme

  • 2. 
    A communication channel modulates waves using 256 QAM and transmits 8 million symbols each second. Approximately how long will it take to transfer 10MB? 
    • A. 

      64 seconds

    • B. 

      8 seconds

    • C. 

      0.125 seconds

    • D. 

      1.25 seconds

  • 3. 
    Which of the following includes only baseband communication links?
    • A. 

      Ethernet, ISDN

    • B. 

      ADSL, ISDN

    • C. 

      Ethernet, ADSL

    • D. 

      Cable, ADSL

  • 4. 
    Which of the following is TRUE in terms of 8-bit checksums?
    • A. 

      Approximately 99.6% of errors are detected

    • B. 

      Approximately 99.6% of data packets will be received correctly

    • C. 

      Approximately 99.6% of packets will not be corrupted during transmission

    • D. 

      Approximately 99.6% of detected error can be corrected

  • 5. 
    Protocols that include checksums include:
    • A. 

      Ethernet and SONET

    • B. 

      TCP and IP

    • C. 

      ATM and IP

    • D. 

      TCP and Ethernet

  • 6. 
    A parity bit is added to each byte of data sent. If all data bits are reversed what will occur?
    • A. 

      The error will always be detected

    • B. 

      No error will ever be detected

    • C. 

      Some errors will be detected

    • D. 

      Most errors will be detected

  • 7. 
    7-bit ASCII data is sent one character at a time using odd parity. The received data contains errors. Which of the following is most likely?
    • A. 

      An odd number of bits in some bytes were corrupted

    • B. 

      The parity bit in some bytes was corrupted

    • C. 

      An even number of bits in some bytes were corrupted

    • D. 

      The reciever has different port setting to the sender

  • 8. 
    The range of frequencies a transmission channel occupies is known as its:
    • A. 

      Symbol rate

    • B. 

      Baud

    • C. 

      Speed

    • D. 

      Bandwidth

  • 9. 
    The most significant advantage of CRCs compared to checksums is: 
    • A. 

      CRCs are used by lower OSI layer protocols than checksums

    • B. 

      CRCs are better at detecting commonly occurring types of transmission errors

    • C. 

      Division is a more reliable operation than addition

    • D. 

      CRCs are usually implemented within the hardware while checksums are implemented within software

  • 10. 
    When using parity bits, checksums and CRCs, what must occur for an error to go undetected?
    • A. 

      The message must be corrupted such that the parity bit, checksum or CRC is unaltered

    • B. 

      An even number of bits within the message must be corrupted

    • C. 

      The error must be the result of hardware errors rather than software or interference errors

    • D. 

      The message must be corrupted in such a way that it becomes some other legitimate message

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