CS-702-C Wireless and Mobile Computing - Jun 2025 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 is difference between LAN, MAN and WAN? Discuss advantages and disadvantages of networking.
   How to answer

   • Define LAN, MAN, WAN with coverage, ownership and technology
   • Compare on range, speed, cost, ownership, examples
   • Advantages of networking: resource sharing, communication, cost saving
   • Disadvantages: security, complexity, maintenance cost
2. 7 Marks
   b"In TCP/IP reference model, transport layer is responsible for end-to-end delivery". Justify the statement with a suitable example.
   How to answer

   • State role of transport layer in TCP/IP reference model
   • Explain end-to-end delivery, port addressing, segmentation and reassembly
   • Contrast TCP vs UDP with example e.g. file transfer / video
   • Justify with suitable example of sender to receiver delivery
3. 7 Marks
   aCompare and contrast the IPv4 and IPv6 header fields. Do they have any fields in common?
   How to answer

   • Draw/tabulate IPv4 vs IPv6 header format and field sizes
   • Compare version, addresses, length, fragmentation, checksum, options
   • Identify common fields: version, payload length, TTL/Hop limit, protocol/next header
   • Conclude differences in simplicity and extensibility
4. 7 Marks
   bHow flow control and error control issues are handled in TCP protocol?
   How to answer

   • Define flow control: sliding window, receiver window, silly window
   • Define error control: sequence numbers, ACK, retransmission, checksum
   • Explain TCP mechanisms: cumulative ACK, timeout, fast retransmit
   • Summarize how reliability is ensured end-to-end
5. 7 Marks
   aWhat is the basic principle that is involved in building up TCP/IP? Also discuss its protocol architecture.
   How to answer

   • State basic design principle of TCP/IP: packet switching, end-to-end, robustness
   • List layers: network access, internet, transport, application
   • Describe function of each layer and key protocols
   • Explain protocol architecture with diagram
6. 7 Marks
   bIllustrate the principle of distance vector routing with the help of a suitable example.
   How to answer

   • Define distance vector routing and Bellman-Ford concept
   • Explain exchange of distance vectors with neighbours periodically
   • Illustrate with small topology example and routing table updates
   • Mention count-to-infinity and split horizon limitations
7. 7 Marks
   aWhat is RARP? Write its limitations. What are the alternative solutions to RARP?
   How to answer

   • Define RARP: mapping MAC to IP address, reverse of ARP
   • List limitations: broadcast based, needs RARP server, no subnetting
   • Give alternatives: BOOTP, DHCP, ICMP
   • Compare briefly why DHCP replaced RARP
8. 7 Marks
   bExplain the mechanism of OADV protocol with an example.
   How to answer

   • Expand OADV as AODV: Ad hoc On-demand Distance Vector
   • Explain route discovery with RREQ/RREP and sequence numbers
   • Explain route maintenance with RERR and example
   • Highlight on-demand vs proactive nature
9. 7 Marks
   aDescribe the architecture of IEEE 802.11 wireless LAN.
   How to answer

   • Define IEEE 802.11 components: STA, AP, BSS, ESS, DS
   • Describe infrastructure vs ad-hoc architecture
   • Explain services: association, authentication, distribution
   • Draw architecture diagram
10. 7 Marks
    bWhat is Mobile IP used for? What are the major problems of Mobile IP?
    How to answer

    • Define Mobile IP purpose: continuity while moving across networks
    • Explain agents, care-of-address, tunneling
    • List problems: triangular routing, handover latency, security
    • Conclude impact on performance
11. 7 Marks
    aWhy "MAC protocol designed for infrastructure based wireless network may not work satisfactory in infrastructure less environment" - Justify?
    How to answer

    • Distinguish infrastructure-based vs infrastructure-less/ad-hoc networks
    • Explain dependence on AP/central coordination in MAC
    • Discuss hidden/exposed terminal, mobility, no central control issues
    • Justify why contention, synchronization fails without infrastructure
12. 7 Marks
    bExplain Indirect TCP (I-TCP) with the help of suitable diagram.
    How to answer

    • Define I-TCP: split connection at base station/MSS
    • Explain fixed host to MSS and MSS to mobile host segments
    • Draw I-TCP architecture showing indirect connection
    • Discuss advantages and handover/disconnection handling
13. 7 Marks
    aExplain in detail about the system architecture of GSM.
    How to answer

    • List GSM subsystems: MS, BSS, NSS, OSS
    • Explain BTS, BSC, MSC, HLR, VLR, EIR, AUC roles
    • Describe interfaces and call flow
    • Draw system architecture diagram
14. 7 Marks
    bExplain about Android OS, features, software stack, SDK and their layers.
    How to answer

    • Define Android OS and open-source features
    • Explain software stack layers: kernel, libraries, runtime, framework, apps
    • Describe SDK tools and development layers
    • Mention versions and key features
15. 7 Marks
    aExplain in detail components of iPhone OS? List the special features of a Mobile OS.
    How to answer

    • List iPhone OS layers: Cocoa Touch, Media, Core Services, Core OS
    • Explain each component function
    • List special mobile OS features: touch, sensors, power, connectivity
    • Compare with desktop OS constraints
16. 7 Marks
    bWrite short notes:

    1. i)M commerce
    2. ii)Mobile payment system
    How to answer

    • Define M-commerce: types, characteristics, examples
    • Define mobile payment system: methods, security, workflow
    • Give applications and advantages/limitations
    • Conclude with current trends