GSM Chapter 3: Cellular Networks and GSM Fundamentals
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Questions and Answers

What happens when the SRES generated by the AUC and MS are compared and found to be the same?

  • The MS is authenticated. (correct)
  • The Kc key is generated.
  • The AUC is authenticated.
  • The SIM card is declared as genuine.
  • What is the purpose of the A8 algorithm?

  • To decrypt ciphered frames.
  • To encrypt over-the-air transmissions.
  • To generate a session key (Kc). (correct)
  • To initialize the stream cipher.
  • What is used to initialize the stream cipher for every frame sent?

  • The MSC's authentication code.
  • The secret key (Kj) and the random challenge RAND.
  • The session key (Kc) and the frame number. (correct)
  • The SIM card's unique identifier.
  • What changes during a call to generate a unique key stream for every frame?

    <p>The 22-bit frame number.</p> Signup and view all the answers

    What is the purpose of the A5 algorithm?

    <p>To encrypt over-the-air transmissions.</p> Signup and view all the answers

    What is generated by both the MS and the network end using the A8 algorithm?

    <p>The session key (Kc).</p> Signup and view all the answers

    What is the main function of Mobility Management (MM) in GSM?

    <p>Managing the mobility of the subscriber and the user</p> Signup and view all the answers

    What algorithm is used for encryption in GSM?

    <p>A5 algorithm</p> Signup and view all the answers

    What is the purpose of the A3 algorithm in GSM?

    <p>Authentication of the mobile subscriber</p> Signup and view all the answers

    What is the term for moving from one point of attachment to another point of attachment within the same network operator?

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

    What is the term for moving from one point to another point between two different network operators?

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

    What is the purpose of the Authentication Center (AUC) in GSM?

    <p>To authenticate the mobile subscriber</p> Signup and view all the answers

    What is the main purpose of the Global System for Mobile Communication (GSM)?

    <p>To describe the protocols for 2G digital cellular networks</p> Signup and view all the answers

    What is the primary reason for subdividing an area into cells in a cellular network?

    <p>To increase the frequency reuse efficiency</p> Signup and view all the answers

    What is the role of the Base Station Controller (BSC) in the GSM system hierarchy?

    <p>To control multiple BTSs and assign cell groups</p> Signup and view all the answers

    What is the purpose of the Authentication Center (AUC) in the GSM system?

    <p>To authenticate and authorize mobile devices</p> Signup and view all the answers

    What is the process of rearranging a group of bits in a particular way to improve the performance of error-correction mechanisms called?

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

    What is the term for the communication channel that connects two or more devices in a GSM network?

    <p>Telecommunication link</p> Signup and view all the answers

    What is the role of the Visitor Location Register (VLR) in the GSM system?

    <p>To store information about the mobile device's location</p> Signup and view all the answers

    What is the purpose of the Mobile Switching Center (MSC) in the GSM system?

    <p>To handle calls originating from or terminating in a fixed network</p> Signup and view all the answers

    What is the term for the process of digitizing user speech in the GSM system?

    <p>Digitizer and source coding</p> Signup and view all the answers

    What is the purpose of the Gateway MSC (GMSC) in the GSM system?

    <p>To handle calls originating from or terminating in a fixed network</p> Signup and view all the answers

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