CS-702-C Wireless and Mobile Computing - Dec 2024 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
   aWhat do you mean by the term internet? Differentiate the operation of bridges and routers.
   How to answer

   • Definition of internet as global network of networks using TCP/IP
   • Function of bridge at data link layer - filtering, forwarding, segmentation
   • Function of router at network layer - path selection, inter-networking
   • Comparison table: layer, address used, broadcast domain, use case
2. 7 Marks
   bDraw and explain TCP-IP architecture of a network.
   How to answer

   • TCP-IP 4-layer model layers list
   • Diagram showing Application, Transport, Internet, Network Access layers
   • Function of each layer with protocols example
   • Encapsulation flow explanation
3. 7 Marks
   aDifferentiate IPv4 and IPv6 based on address structure and address space.
   How to answer

   • IPv4 32-bit dotted decimal vs IPv6 128-bit hexadecimal structure
   • Address space size: 2^32 vs 2^128
   • Header, fragmentation, IPSec, notation differences
   • Comparison table on basis of structure and space
4. 7 Marks
   bDiscuss the process of subnetting and supernetting.
   How to answer

   • Definition of subnetting: borrowing host bits, subnet mask
   • Steps of subnetting with example
   • Definition of supernetting: combining routes, CIDR
   • Benefits and comparison
5. 7 Marks
   aDefine the terms :

   1. i)VLAN
   2. ii)Firewall
   How to answer

   • VLAN definition: logical segmentation of LAN
   • Firewall definition: network security barrier
   • Types/purpose of each in brief
   • Example use case
6. 7 Marks
   bDifferentiate exterior and interior gateway protocols.
   How to answer

   • Definition of IGP vs EGP and domain scope
   • Examples: RIP, OSPF vs BGP
   • Comparison on metrics, hierarchy, policy
   • Use cases
7. 7 Marks
   aIf WAN link is 2 Mbps and RTT between source and destination is 300 msec, what would be the optimal TCP window size needed to fully utilize the line?
   How to answer

   • Formula: Optimal window = Bandwidth x RTT (bandwidth-delay product)
   • Convert 2 Mbps x 300 msec = 600,000 bits = 75,000 bytes
   • Convert to KB / segments if needed
   • Interpretation for full line utilization
8. 7 Marks
   bHow media access is different in Wireless networks as compared to wired networks?
   How to answer

   • Wired: CSMA/CD, collision detection possible
   • Wireless: hidden/exposed terminal, cannot detect collision
   • CSMA/CA, RTS/CTS, MACA/MACAW mechanisms
   • Comparison table
9. 7 Marks
   aWhat are Adhoc networks? How are they different from traditional networks?
   How to answer

   • Definition of Adhoc network: infrastructure-less, self-organizing
   • Characteristics: dynamic topology, multi-hop
   • Differences from traditional infrastructure networks
   • Examples/applications
10. 7 Marks
    bGive a classification of Adhoc routing protocols.
    How to answer

    • Classification criteria: proactive, reactive, hybrid
    • Examples: DSDV, OLSR vs AODV, DSR vs ZRP
    • Table with approach, overhead, latency
    • Brief working of each class
11. 7 Marks
    aDiscuss the function of transport layer. How protocols of traditional network are not suitable for wireless networks?
    How to answer

    • Transport layer functions: end-to-end delivery, segmentation, flow/error control
    • TCP/UDP overview
    • Why traditional TCP fails in wireless: high BER, mobility, disconnections
    • Need for I-TCP, Snoop, Mobile TCP
12. 7 Marks
    bWith the help of a neat diagram explain the architecture of cellular network. What is the concept of handover?
    How to answer

    • Cellular architecture diagram: MS, BTS, BSC, MSC, HLR/VLR
    • Frequency reuse and cell concept
    • Handover definition and types: hard, soft, intra/inter-cell
    • Handover process steps
13. 7 Marks
    aWhat are the special constraints and requirements of operating systems of mobile devices?
    How to answer

    • Constraints: limited power, memory, processing, display
    • Requirements: portability, low power, real-time, connectivity
    • Mobility, security, heterogeneity issues
    • Examples of mobile OS adaptations
14. 7 Marks
    bWhat is M commerce? Write its pros and cons in a developing country like India.
    How to answer

    • Definition of M-commerce: transactions via mobile devices
    • Pros: ubiquity, reach, convenience in India
    • Cons: security, small screen, connectivity, literacy
    • Relevance to developing country context
15. 14 Marks
    Write short notes on any two of the followings.

    1. a)Android operating system
    2. b)GSM Architecture
    3. c)Mobile IP
    How to answer

    • For each chosen topic: definition and architecture/components
    • Key features/protocols/working steps
    • Diagram where applicable (GSM, Mobile IP)
    • Applications/limitations