Ch. 2 Communication Models Test
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Questions and Answers

What is the purpose of using models in data communications?

  • To physically capture objects
  • To make data communications more abstract
  • To simplify explanation when the real object is too complex to visualize (correct)
  • To complicate the understanding of data communications
  • Which model is a model of the functionality required to communicate from the source end user to the destination end user?

  • Transmission Functionality Model
  • International Organization for Standardization Open Systems Interconnection model (correct)
  • End User Model
  • Data Communication Model
  • Why is it important to understand the OSI model in data communications?

  • It is crucial to understanding data communications (correct)
  • It simplifies the communication process
  • It goes from the abstract to the concrete
  • It makes data communications more complex
  • What does the mail analogy represent in relation to the OSI model?

    <p>The similarity to end-user-to-end-user communications</p> Signup and view all the answers

    In the mail analogy, what does 'the original sender' represent?

    <p>Source end user</p> Signup and view all the answers

    What is the critical question addressed regarding the letter in the mail analogy?

    <p>How did the sending user know that the letter was received?</p> Signup and view all the answers

    What does the OSI model describe and generally specify?

    <p>The order of functions in transmission</p> Signup and view all the answers

    What is true about using models in data communications?

    <p>'Models simplify explanation when objects are simple to visualize'</p> Signup and view all the answers

    'Modeling' is used for what purpose?

    <p>'To simplify explanation'</p> Signup and view all the answers

    'What do models represent?' According to the text, models represent:

    <p>'Objects that cannot be physically captured'</p> Signup and view all the answers

    What type of application model dictates how communications and networking software applications are applied?

    <p>User Services</p> Signup and view all the answers

    Which type of system supplies the organization, as well as the boundaries, procedures, and rules?

    <p>Business Services</p> Signup and view all the answers

    In control systems, what approach is mentioned as a better method for exchanging data?

    <p>Publisher-Subscriber approach</p> Signup and view all the answers

    What does the publisher-subscriber method allow a client application to communicate with a server for?

    <p>All of the above</p> Signup and view all the answers

    Which model refers to a stand-alone PC running a check balancing program?

    <p>One-tier model</p> Signup and view all the answers

    What are the majority of databases of any size managed by?

    <p>Relational database management systems</p> Signup and view all the answers

    In the OSI model, which layer provides the mechanical and electrical means of connecting to the medium?

    <p>Physical Layer</p> Signup and view all the answers

    Which layer of the OSI model is responsible for reliable end-user-to-end-user communications?

    <p>Transport Layer</p> Signup and view all the answers

    What is the primary function of the Session layer in the OSI model?

    <p>Virtual connection establishment</p> Signup and view all the answers

    Which model defines data communications in only five layers, in contrast to the OSI model?

    <p>Internet Model</p> Signup and view all the answers

    What does the Network layer ensure in the sending end's protocol header?

    <p>Proper IP address format</p> Signup and view all the answers

    Which standard divides the OSI Data Link layer into two distinct sublayers: Media Access Control and Logical Link Control?

    <p>IEEE 802 Model</p> Signup and view all the answers

    What does the Presentation layer ensure about communications data?

    <p>Correct syntax for applications layer</p> Signup and view all the answers

    What does the Application layer do in the OSI model?

    <p>User interface and output</p> Signup and view all the answers

    Which protocol is not OSI compliant but provides Layer 4 functionality?

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

    What is IEEE 802.3 standard related to?

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

    The Internet Protocol and Internet Packet Exchange are associated with which layer?

    <p>Network Layer</p> Signup and view all the answers

    What is the role of User Datagram Protocol (UDP) SAPs?

    <p>Addresses assigned by controlling program</p> Signup and view all the answers

    Which layer of the OSI model is responsible for reliable end-user-to-end-user communications?

    <p>Transport layer</p> Signup and view all the answers

    What is the primary function of the Network layer in the OSI model?

    <p>Performing end-user routing</p> Signup and view all the answers

    Which protocol is commonly used for connection-oriented communication at Layer 4 of the OSI model?

    <p>Transmission Control Protocol (TCP)</p> Signup and view all the answers

    What is the main responsibility of the Presentation layer in the OSI model?

    <p>Ensuring correct data syntax</p> Signup and view all the answers

    In the OSI model, where does the line of demarcation between data communications and data processing exist?

    <p>Between Transport and Session layers</p> Signup and view all the answers

    Which model defines data communications in only five layers, in contrast to the OSI model?

    <p>The Internet model</p> Signup and view all the answers

    What is the main focus of Layer 3 in the OSI model?

    <p>Routing functions</p> Signup and view all the answers

    What does the IEEE 802 standard specifically define for different standard networks?

    <p>Media Access Control and Logical Link Control sublayers</p> Signup and view all the answers

    Which standard network type is defined by IEEE 802.3?

    <p>Carrier Sense Multiple Access with Collision Detection network</p> Signup and view all the answers

    Which protocol is commonly used at Layer 3 of the TCP/IP suite?

    <p>Internet Protocol (IP)</p> Signup and view all the answers

    What is one of the main concerns of the Session layer in the OSI model?

    <p>Virtual connection establishment and release</p> Signup and view all the answers

    In the OSI model, what does the Physical layer provide?

    <p>Line termination and/or impedance matching</p> Signup and view all the answers

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