If my file system only has lots of big video files what block size do I want?

1
If my file system only has lots of big video
files what block size do I want?

1. Large (correct)
2. Small

2

• Why bother with index blocks?
• A. Allows greater file size. (true)
• B. Faster to create files.
• C. Simpler to grow files. (true)
• D. Simpler to prepend and append to files.
• E. Scott Summers is the X-mens Cyclops

3
Which is a metadata consistency problem?

• A. Null double indirect pointer
• B. File created before a crash is missing
• C. Free block bitmap contains a file data block
  that is pointed to by an inode (true)
• D. Directory contains corrupt file name (could be
  argued)

4
Where on the disk would you put the journal for a
journaling file system?

1. Anywhere
2. Outer rim (good choice)
3. Inner rim
4. Middle
5. Wherever the inodes are (also good)

5
Web requests conform to what model?

1. Many-to-one (mostly)
2. One-to-one
3. One-to-many

6
Java RMI (remote method invocation) is an example
of an RPC system.

1. Yes (it is)
2. No

7
Why does turning every file system operation into
an RPC to a server perform poorly?

1. Disk latency is larger than network latency
2. Network latency is larger than disk latency
3. No server-side cache
4. No client-side cache (deadly)

8
When you log into a website using an http URL,
which property are you missing?

1. Authentication
2. Integrity (yes)
3. Privacy (yes)
4. Authorization (arguable)
5. None

9
When you log into a website using an https URL,
which property are you missing?

1. Authentication
2. Integrity
3. Privacy
4. Authorization (arguable)
5. None

10
Password security

• Instead of hashing your password, I will hash
  your password concatenated with a random salt.
  Then I store the unhashed salt along with the
  hash.
• (password . salt)H salt
• What attack does this address?

1. Brute force password guessing for all accounts.
   (yes)
2. Brute force password guessing for one account.
3. Trojan horse password value
4. Man-in-the-middle attack when user gives password
   at login prompt.

11
Dweeb Nolife develops a file system that responds
to requests with digitally signed packets of data
from a content provider. Any untrusted machine
can serve the data and clients can verify that
the packets they receive were signed. So
utexas.edu can give signed copies of the
read-only portions of its web site to untrusted
servers. Dweebs FS provides which property?

1. Authentication of file system users
2. Integrity of file system contents (yes)
3. Privacy of file system data metadata
4. Authorization of access to data metadata

12
If A-gtB and C-gtB does A-gtC?

1. Yes
2. No (true)

13
Distributed control vs. central control

1. Distributed control is easier, and more fault
   tolerant than central control.
2. Distributed control is harder, and more fault
   tolerant than central control. (true)
3. Distributed control is easier, but less fault
   tolerant than central control
4. Distributed control is harder, but less fault
   tolerant than central control

14
Distributed concensus in the presence of link
failures is

1. possible
2. not possible (true)

15
Can the two phase commit protocol fail to
terminate?

1. Yes (true)
2. No

16
In the bully algorithm can there every be a point
where the highest number process is not the
leader?

1. Yes (true)
2. No

17
Byzantine fault tolerant algorithms tend to run
quickly.

1. Yes
2. No (true)