Final Jeopardy Answers

• File Systems
  • The disadvantage of RAID level 0.
  • The type of system and workload that LFS was based on.
  • The observation that inspired FFS.
  • The maximum size of a UNIX file, in disk blocks.
  • The sequence of actions that occurs when a user executes the following, in terms of inodes and directory entries: touch file && ln file file2 && rm file && rm file2
• Networks
  • The purpose of a router.
  • The most common layer 1, layer 2, and layer 3 standards.
  • A common sequence of operations that have been abstracted to make building distributed systems easier.
  • A serious problem with RPC.
  • Three functions provided by TCP.
• Virtual Memory
  • Segmentation is free from this form of wasted space.
  • The number of memory references that the first instruction will produce, on an x86, assuming that instruction is a load.
  • When the working set of a system exceeds the available memory.
  • The property that FIFO page replacement does not have, allowing it to exhibit Belady's anomaly.
  • The effect, in systems with a virtually indexed L1-cache that does not need to access the TLB, on the ability of a pager to emulate LRU replacment.
• Miscelaneous
  • The two roles fulfilled by an OS, the first of which is also provided by a VMM.
  • The difference between authentication and authorization.
  • The effect of building systems out of a large number of cheap machines.
  • In a virtual machine, the component responsible for executing the majority of guest instructions.
  • The reason a virtual MMU device is more difficult to support than a virtual disk.