CY-501 OS Internals for Security Support - Nov 2022 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 the role of kernel in operating systems? Explain with help of neat diagram?
   How to answer

   • Definition and functions of kernel as core of OS
   • Role: process, memory, device, file and security management
   • Kernel modes and system call interface
   • Neat layered diagram showing hardware-kernel-shell-applications
2. 7 Marks
   bWhat is the use of Buffer Cache and Buffer header? Explain in detail.
   How to answer

   • Purpose of buffer cache for disk I/O performance
   • Structure and fields of buffer header
   • Allocation, search and release operations
   • Advantages in minimizing disk access
3. 7 Marks
   aDefine IPC. How IPC is implemented with help of shared memory method, explain?
   How to answer

   • Definition of IPC (Inter-Process Communication)
   • Concept of shared memory region
   • Steps: creation, attach, read/write, detach
   • Synchronization issues and advantages
4. 7 Marks
   bExplain about different types of Semaphores with examples.
   How to answer

   • Definition of semaphore and wait/signal operations
   • Binary vs counting semaphores
   • Examples: mutex, producer-consumer
   • Use in process synchronization
5. 7 Marks
   aHow to implement Security and Protection in Operating Systems, briefly explain?
   How to answer

   • Goals of security vs protection in OS
   • Authentication, access control, encryption
   • Protection mechanisms: domains, ACLs, capabilities
   • Brief implementation approach
6. 7 Marks
   bWrite short notes on Worms, Trojans and Root-kits.
   How to answer

   • Definition and behavior of worms
   • Definition and behavior of Trojans
   • Definition and behavior of rootkits
   • Differences and detection/prevention
7. 7 Marks
   aDescribe about Virtualization techniques used for security implementation.
   How to answer

   • Concept of virtualization and hypervisors
   • Types: full, para, OS-level virtualization
   • Isolation and sandboxing for security
   • Examples of secure implementation
8. 7 Marks
   bExplain in detail about secure co-processors.
   How to answer

   • Definition and purpose of secure co-processor
   • Architecture and tamper resistance
   • Cryptographic functions and key storage
   • Applications in secure systems
9. 7 Marks
   aWrite about "Windows internals".
   How to answer

   • Overview of Windows kernel architecture
   • Executive, kernel, HAL components
   • Process, memory and I/O management
   • Security reference monitor
10. 7 Marks
    bWhat is Socket? What do you know about socket programming? Explain it.
    How to answer

    • Definition of socket and socket API
    • Types: stream, datagram, raw sockets
    • Socket programming steps: socket, bind, listen, accept/connect
    • Example client-server communication
11. 7 Marks
    aWhat is Mounting and Un-mounting? Write advantages and disadvantages.
    How to answer

    • Definitions of mounting and un-mounting
    • Procedure to attach/detach file system
    • Advantages: unified namespace, flexibility
    • Disadvantages: complexity, failure risks
12. 7 Marks
    bExplain Principals of Concurrency.
    How to answer

    • Concept of concurrency in OS
    • Principles: mutual exclusion, synchronization
    • Issues: deadlock, starvation, race condition
    • Mechanisms to handle concurrency
13. 7 Marks
    aDiscuss the problem with Ransomware malware. How to protect from this?
    How to answer

    • What ransomware is and attack lifecycle
    • Impact: encryption, extortion, data loss
    • Protection: backup, patching, awareness
    • Recovery and mitigation steps
14. 7 Marks
    bWhat is the importance of secure wallets? Explain in detail.
    How to answer

    • Concept of secure wallets for keys/credentials
    • Importance for confidentiality and integrity
    • Features: encryption, authentication, backup
    • Use in OS and digital payments
15. 14 Marks
    Write a short note on any two of the following:

    1. a)Windows global flags
    2. b)System worker threads in windows
    3. c)Structure of Buffer pool
    4. d)Process scheduling
    How to answer

    • Select any two topics from given list
    • Key definitions and components for each
    • Working and OS relevance
    • Concise structured short notes