Security in Computing (3rd Edition)

CS 161 Computer Security
Fall 2005 Joseph/Tygar/Vazirani/Wagner
MT 1
P
RINT
your name: ,
(last) (first)
S
IGN
your name:
P
RINT
your Unix account name:
P
RINT
your TA’s name:
You may consult any books, notes, or other paper-based inanimate objects available to you. Calculators and
computers are not permitted. Please write your answers in the spaces provided in the test; in particular, we
will not grade anything on the back of an exam page unless we are clearly told on the front of the page to
look there.
Please be concise.
If you have questions, make a best guess and state your assumptions.
You have 50 minutes. There are 4 questions, of varying credit (100 points total). The questions are of
varying difficulty, so avoid spending too long on any one question.
Do not turn this page until your proctor tells you to do so.
Problem 1
Problem 2
Problem 3
Problem 4
Total
CS 161, Fall 2005, MT 1 1

Problem 1. [Firewalls and Network Threats] (30 points)
List and explain three network threats that a firewall does not protect against. (If a threat only applies to