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Questions – Network Layer Model Dr John Cowell

phones off (please). Questions – Network Layer Model Dr John Cowell. Q 1. Four layers of the OSI model are used for user services. Listed in order with the upper layer first they are: Application, Presentation, Session, Transport. Transport, Network, Data Link, Physical

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Questions – Network Layer Model Dr John Cowell

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  1. phones off(please) Questions – Network Layer Model Dr John Cowell

  2. Q 1 • Four layers of the OSI model are used for user services. Listed in order with the upper layer first they are: • Application, Presentation, Session, Transport. • Transport, Network, Data Link, Physical • Application, Session, Presentation, Transport. • Presentation, Application, Transport, Session • Presentation, Transport, Network, data Link CSCI1412-HW-4

  3. Q2 • What is NOT a function of the Transport Layer • End to end communication • Flow control • Multiplexing • Managing re-transmission on error detection • Breaking data into packets or frames CSCI1412-HW-4

  4. Q3 • Which one of the following statements is performed by the Presentation layer: • Synchronising communication between applications. • Encrypt data if required. • Multiplexing of messages. • Error checking and recovery. • Manages reconnection on premature termination. CSCI1412-HW-4

  5. Q4 • Which of the following is NOT described out by the Physical layer • The transmission media • The network topology • The electrical or optical signalling characteristics. • The organisation of data into frames • The characteristics of the transmission devices CSCI1412-HW-4

  6. Answers • Q1 – A • Q2 – D - This is the role of the Session layer. • Q3 – B • Q4 – D – This is carried out by the Data Link layer. CSCI1412-HW-4

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