Fall 2025, CSCI 447, Test 3 Review

Quick Review: Topics from Chapters 13(part), 14, 15, 16, 17, 18, 19, and Toy OS. (storage.pdf and other.pdf slide series)

Topic Review:

• Chapter 13: File-System Interface
• File sharing and consistency
• Protection
• Chapter 14: File-System Implementation
• Disks -- basic ideas
• Disk operations, seek, ...
• On disk vs in memory information
• Directory implementations
• File Allocation methods, contiguous, linked, indexed
• Free space management
• File system performance
• File system maintenance
• Log structured file systems
• WAFL
• Chapter 15: File-System Internals
• Other kinds of file systems
• File system mounting
• De-fragmentation
• File system consistency
• Chapter 16: Security (As much as done in class.)
• Local attacks
• Attack Methods
• Levels of Security
• Security problems
• Trojan Horse Programs
• Trap Door
• Logic Bomb
• Stack and buffer overflows
• Viruses
• Security of default install
• network threats
• cryptography as a security tool
• User Authentication
• passwords
• Biometrics
• Total security policy
• Security defenses
• Vulnerability Assessment
• Intrusion Detection
• Chapter 17: Protection
  • Goals of protection
  • Principles of protection
  • Protection Rings
  • Domain of protection
  • Access matrix
  • Implementation of access matrix
  • Revocation of access rights
  • Other methods of protection: property lists, ...
  • Language based protection
• Chapter 18: Virtual machines (As much as discussed in class)
  • Basic concepts
  • History
  • Different kinds of VMMs
  • Paravirtualization
  • Emulation
  • Application Containment
  • Uses of VMMs
  • Basic tools: trap and emulate
• Chapter 19: Distributed System Structures
• Distributed vs Parallel
• Why distributed
• Kinds of Distributed OSes
• Distributed OS issues
• Process Migration
• Robustness
• Distributed File systems
• Naming
• Remote File access
• Caching: block vs. whole file
• Replication
• File access semantics: UNIX, session, immutable read-only
• AFS
• Coda
• NFS
• Toy OS
• Toy OS as presented in assignments
• Don't forget the places in the slides where reading has been assigned.