cis4307, Fall 2009
5 (15) Minute Test #10
December 3, 2009


1. (10)  Consider atomicity in a distributed system. What is the new 
	 problem respect a single system, and how it solved?












2. (5) How can I securely set up a password with an authenticated server?









3.  (5) Describe the difference between physical and logical clocks, and why 
	logical clocks suffice in many circumstances.










4. (15) Implement in C the function 
	   int longest(const char * a, const char *b)
	which returns the length of of the longest substring of a and b.
	For example, given "rosangela" and "roangieka" returns 3.