AD-602 Computer Networks - May 2023 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aIdentify the layers in OSI reference model and illustrate their functions with suitable diagram.
   How to answer

   • List 7 layers of OSI reference model in order
   • State function of each layer briefly
   • Illustrate with layered diagram showing peer communication and encapsulation
   • Mention device/protocol examples per layer
2. 7 Marks
   bDiscuss about the design issues of computer network.
   How to answer

   • Define design issues: addressing, error control, flow control, multiplexing, routing
   • Discuss reliability, scalability, resource sharing, security
   • Explain trade-offs in layering and service selection
3. 7 Marks
   aGive the difference between connection oriented and connection less services.
   How to answer

   • Define connection-oriented service with connection setup phase
   • Define connectionless service with independent datagrams
   • Compare on reliability, ordering, overhead, applications
   • Give examples: TCP vs UDP/IP
4. 7 Marks
   bExplain the working principle of Sliding Window protocol with suitable diagram.
   How to answer

   • Explain sender and receiver window concept and sequence numbers
   • Describe Go-Back-N / Selective Repeat sliding operation with ACKs
   • Illustrate window advancement with suitable diagram
   • Mention efficiency and flow control benefit
5. 7 Marks
   aExplain in detail about the error and flow control mechanisms employed at data link layer.
   How to answer

   • Define error control: detection, retransmission, ARQ types
   • Define flow control: feedback, window, rate limiting
   • Explain mechanisms at data link layer: stop-and-wait, sliding window
   • Mention parity, CRC, Hamming code briefly
6. 7 Marks
   bExplain CSMA Protocol. Explain how collisions are handled in CSMA/CD.
   How to answer

   • Explain CSMA principle: carrier sensing, persistent/non-persistent variants
   • Explain CSMA/CD collision detection and jam signal
   • Describe Binary Exponential Backoff for collision handling
   • Compare efficiency and use in Ethernet
7. 7 Marks
   aDiscuss the Least Cost routing algorithm with suitable example.
   How to answer

   • Define least-cost routing and link cost metric
   • Outline Dijkstra shortest-path steps
   • Work out suitable example graph with distance table
   • Mention convergence and link-state use
8. 7 Marks
   bWhat is Routing? Differentiate between broadcast routing and Multicast routing?
   How to answer

   • Define routing and its need
   • Define broadcast routing with methods
   • Define multicast routing with group management
   • Differentiate on delivery, bandwidth, addressing
9. 7 Marks
   aExplain in detail about TCP Connection management.
   How to answer

   • Explain three-way handshake for connection establishment
   • Explain sequence numbers, SYN/FIN/ACK flags
   • Explain graceful connection termination
   • Mention state diagram and timers
10. 7 Marks
    bGive and explain UDP Header Format.
    How to answer

    • Draw UDP header with 4 fields of 16 bits each
    • Explain source/destination port, length, checksum
    • Mention 8-byte fixed header and connectionless use
    • Give application examples
11. 7 Marks
    aWhat is Fragmentation and Reassembly? Why do we need fragmentation and reassembly at network? Explain.
    How to answer

    • Define fragmentation and reassembly and MTU need
    • Explain why needed in heterogeneous networks
    • Describe identification, offset, MF flag process
    • Mention transparent vs non-transparent fragmentation
12. 7 Marks
    bDifferentiate between congestion control and flow control.
    How to answer

    • Define congestion control vs flow control scope
    • Compare point of control: network-wide vs sender-receiver
    • Compare mechanisms: slow-start, RED vs window/ACK
    • Give examples of each
13. 7 Marks
    aExplain Simple Network Management Protocol (SNMP) and its functions.
    How to answer

    • Define SNMP role in network management
    • Explain manager-agent-MIB architecture
    • List PDUs: Get, Set, Trap etc.
    • Mention functions: monitoring, configuration, fault management
14. 7 Marks
    bWhat are Traditional ciphers? What are the different techniques used in traditional cipher? Explain.
    How to answer

    • Define traditional ciphers and security goal
    • Explain substitution techniques: Caesar, monoalphabetic
    • Explain transposition techniques
    • Give examples of each
15. 14 Marks
    Write a short notes on any two:

    1. i)SMTP
    2. ii)TCP Timer Management
    3. iii)ALOHA and Slotted ALOHA
    4. iv)BEB Algorithm
    How to answer

    • Select any two topics from list
    • Give definition, working and diagram for each
    • Mention applications/limitations
    • Conclude with significance