Computer Communication Chapter 6
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Questions and Answers

What is the purpose of an error correction code?

  • To map k-bit input onto an n-bit codeword (correct)
  • To reduce the number of stations on a medium
  • To reduce the possibility of error detection
  • To increase the effective data rate

    • What type of configuration topology involves only two stations?

  • Half duplex
  • Full duplex
  • Multipoint
  • Point-to-point (correct)

    • What is the main difference between half duplex and full duplex?

  • Error detection method
  • Type of transmission
  • Number of stations
  • Number of data paths (correct)

    • What is the purpose of a full duplex configuration?

    <p>To allow simultaneous transmission and reception</p> Signup and view all the answers

    What type of transmission is characterized by alternate transmission and reception?

    <p>Half duplex</p> Signup and view all the answers

    What is the benefit of using a line configuration?

    <p>Efficient use of resources</p> Signup and view all the answers

    What is the term for the physical arrangement of stations on a medium?

    <p>Line configuration topology</p> Signup and view all the answers

    What is the term for a traditional mainframe computer and terminals setup?

    <p>Multipoint topology</p> Signup and view all the answers

    What is the purpose of error detection and correction?

    <p>To detect and correct errors in transmission</p> Signup and view all the answers

    What is the term for the classification of data exchange?

    <p>Duplex</p> Signup and view all the answers

    What is a key characteristic of asynchronous transmission?

    <p>Adds 2-3 bits of overhead per character</p> Signup and view all the answers

    What type of error occurs when a contiguous sequence of bits is altered?

    <p>Burst error</p> Signup and view all the answers

    What is the purpose of a preamble and postamble in synchronous transmission?

    <p>To indicate the start and end of a block of data</p> Signup and view all the answers

    What is the primary disadvantage of asynchronous transmission?

    <p>Higher overhead compared to synchronous transmission</p> Signup and view all the answers

    What is the purpose of error detection codes?

    <p>To detect errors in transmission</p> Signup and view all the answers

    What is a key advantage of synchronous transmission?

    <p>Lower overhead compared to asynchronous transmission</p> Signup and view all the answers

    What is the purpose of the frame check sequence (FCS) in cyclic redundancy check (CRC) error detection?

    <p>To generate a checksum for error detection</p> Signup and view all the answers

    What is a limitation of error correction in wireless applications?

    <p>High bit error rate causing retransmissions</p> Signup and view all the answers

    What is the primary advantage of error correction over error detection?

    <p>Ability to correct errors without retransmission</p> Signup and view all the answers

    What is the purpose of parity bits in asynchronous transmission?

    <p>To detect errors in transmission</p> Signup and view all the answers

    What is a key advantage of differential encoding?

    <p>It is more reliable in detecting transitions than levels</p> Signup and view all the answers

    What is a characteristic of Manchester encoding?

    <p>A transition in the middle of each bit period</p> Signup and view all the answers

    What is a limitation of multilevel binary encoding?

    <p>It can lose synchronization with long runs of zeros or ones</p> Signup and view all the answers

    What is a key benefit of bipolar-AMI encoding?

    <p>It has no loss of synchronization with long strings of ones</p> Signup and view all the answers

    What is a key difference between bipolar-AMI and pseudoternary encoding?

    <p>Pseudoternary uses no line signal for zero while bipolar-AMI uses a pulse</p> Signup and view all the answers

    What is a key characteristic of scrambling in data transmission?

    <p>It is used to prevent long runs of zeros or ones</p> Signup and view all the answers

    What is a key benefit of multilevel binary encoding?

    <p>It can represent more than one bit of data per signal element</p> Signup and view all the answers

    What is a key limitation of non-return-to-zero encoding?

    <p>It can lose synchronization with long runs of zeros or ones</p> Signup and view all the answers

    What is a key difference between Manchester and differential encoding?

    <p>Differential encoding uses transitions while Manchester encoding uses levels</p> Signup and view all the answers

    What is a key benefit of using bipolar-AMI encoding?

    <p>It has lower bandwidth and easy error detection</p> Signup and view all the answers

    What is the primary characteristic of a digital signal?

    <p>Discrete, discontinuous voltage pulses</p> Signup and view all the answers

    What is the term used to describe the rate of data transmission in bits per second?

    <p>Data rate</p> Signup and view all the answers

    What is the primary factor that affects signal interpretation in digital signaling?

    <p>Signal to noise ratio</p> Signup and view all the answers

    What is the term used to describe the rate at which the signal level changes, measured in baud?

    <p>Modulation rate</p> Signup and view all the answers

    What is the primary characteristic of unipolar encoding?

    <p>All signal elements have the same sign</p> Signup and view all the answers

    What is the primary purpose of clocking in digital signaling?

    <p>To determine the timing of bits</p> Signup and view all the answers

    What is the term used to describe the duration of a bit in digital signaling?

    <p>Time taken for the transmitter to emit the bit</p> Signup and view all the answers

    What is the primary characteristic of Nonreturn to Zero-Level (NRZ-L) encoding?

    <p>Voltage remains constant during bit interval</p> Signup and view all the answers

    What is the term used to describe binary 1 and binary 0 respectively?

    <p>Mark and space</p> Signup and view all the answers

    What is the primary factor that determines the modulation rate in digital signaling?

    <p>Type of digital encoding used</p> Signup and view all the answers

    What is the primary purpose of scrambling in digital transmission?

    <p>To replace sequences that would produce constant voltage</p> Signup and view all the answers

    What is unique about Differential Manchester Encoding?

    <p>It uses a midbit transition to clock only the start of the bit period</p> Signup and view all the answers

    What is the main advantage of B8ZS encoding?

    <p>It reduces the DC component</p> Signup and view all the answers

    What is the primary characteristic of Amplitude Shift Keying (ASK)?

    <p>It represents 0 and 1 by different amplitudes</p> Signup and view all the answers

    What is the main disadvantage of Amplitude Shift Keying (ASK)?

    <p>It is inefficient and prone to sudden gain changes</p> Signup and view all the answers

    What is the primary characteristic of Binary Frequency Shift Keying (BFSK)?

    <p>It represents 0 and 1 by different frequencies</p> Signup and view all the answers

    What is an advantage of using Multiple FSK?

    <p>It is more bandwidth efficient</p> Signup and view all the answers

    What is the primary characteristic of Phase Shift Keying (PSK)?

    <p>It represents 0 and 1 by different phases</p> Signup and view all the answers

    What is the primary advantage of Differential PSK?

    <p>It shifts the phase relative to the previous transmission</p> Signup and view all the answers

    What is the primary application of Modulation Techniques in telecommunications?

    <p>Public telephone systems and high-speed data transmission</p> Signup and view all the answers

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