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Class 2: Sept 10, 2007

1. Networking: a brief mention of IP ADDRESSES
	4 bytes
	network part + host part.
	Subnet mask provides cutoff
	Each machine needs:
		IP addr (network part is predetermined)
		subnet mask
		router
		DNS server

	WHO HANDS THESE OUT? 
	DHCP overview
	
	First mention of NAT
	
	Brief review of DNS
		basics of how lookup works, hierarchically
			edu
			luc.edu
			cs.luc.edu
			csed.cs.luc.edu
			
		cacheing
		
		security implications
		
		alice.cs.luc.edu and bob.cs.luc.edu do NOT need to have related IP addrs!
		

2. File systems: NTFS and FAT
	Permissions
		Runtime OS locking of files (even for FAT)
		
		Software permissions: 
		Example: a database may determine what access you have to which records.
		But if you can copy the entire database and read it "at home",
		you bypass this!
		
		File permissions
			These are tied to your identity on the machine.
			
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Lab: 
	* check the status of "Hide extensions for known file types"
	
	* create two accounts,
	  try to create a file readable by only one of the accounts.
	  can Owner read the file? 
	  can Owner change the permissions or Take Ownership?
	  	
	* try making the desktop read-only
	
	* kill & restart explorer.exe, using taskmgr