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2018 question paper

Computer Networks

3 questions

  1. Q1a. This layer is an addition to OSI model when compared with TCP/IP model: (i) Application layer (ii) Presentation layer (iii) Session layer (iv) Both session layer and presentation layer20182m

    Module 1: Physical Layer & Data Communication

    This layer is an addition to OSI model when compared with TCP/IP model:
    (i) Application layer
    (ii) Presentation layer
    (iii) Session layer
    (iv) Both session layer and presentation layer

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    Worked Solution

    Answer

    (iv) Both Session layer and Presentation layer

    Explanation

    The OSI model contains seven layers, while the traditional TCP/IP model groups several OSI functions together.

    The OSI Presentation layer handles functions such as data translation/format conversion, encryption/decryption, and compression. The OSI Session layer handles session establishment, management, synchronization, and termination.

    In the TCP/IP model, these functions are generally incorporated into the broader Application layer rather than represented as separate Presentation and Session layers.

    Therefore, both the Session and Presentation layers are separate additions in the OSI model when compared with the traditional TCP/IP model.

    Final answer: (iv) Both session layer and presentation layer.

  2. Q1b. Application layer is implemented on: (i) end systems (ii) NIC (iii) ethernet (iv) route20182m

    Module 5: Application Layer & Security

    Application layer is implemented on:
    (i) end systems
    (ii) NIC
    (iii) ethernet
    (iv) route

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    Answer

    (i) End systems

    Explanation

    The Application layer contains protocols and services used directly by network applications, such as HTTP, DNS, SMTP, and FTP. These applications run on end systems (hosts).

    NICs and Ethernet are associated with lower networking layers, while routers are intermediate forwarding devices.

    Final answer: (i) End systems.

  3. Q1c. Which of the following is not applicable for IP? (i) Error reporting (ii) Handle addressing conventions (iii) Datagram format (iv) Packet handling conventions20182m

    Module 3: Network Layer & Routing

    Which of the following is not applicable for IP?
    (i) Error reporting
    (ii) Handle addressing conventions
    (iii) Datagram format
    (iv) Packet handling conventions

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    Answer

    (i) Error reporting

    Explanation

    IP is responsible for logical addressing, datagram format, and packet forwarding/handling across interconnected networks. However, error reporting is provided by ICMP, which operates alongside IP rather than being a core function of IP itself.

    Therefore, among the given options, error reporting is the one not directly applicable as an IP function.

    Final answer: (i) Error reporting.

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