Here's what I think are the important things to absorb from the third week's reading:

From ULSA "Chapter 6 -- The Filesystem"

   Filesystems include not only simple files and directories, but also
   pseudo filesystems of various varieties (/proc, tmpfs, /dev/shm, /sys,
   and so forth)

   Pathnames can be either be absolute (start with "/") or relative.

   Mounting and unmounting.

   Popular organizations for the file tree (viz., man hier).

   Typical tools like ls, fuser, rm, ln.

   Permissions and ownership (recall previous chapter).

From ULSA "Chapter 7 -- Adding New Users"

   Understand /etc/passwd, /etc/group, and /etc/shadow schemes.

   Know that MD5 is *not* useful for any type of security scheme (book
   is not up-to-date on this point.)

   Initial file set up for an account, and /etc/skel.

From MWS2008R2 "Chapter 4 -- Windows Server 2008 IPv4"

   Understand that Microsoft has made many improvements in TCP and
   and thus services built around TCP; however, the benefits can
   be constrained by your wider network.

From MWS2008R2 "Chapter 5 -- DNS and Naming in Server 2008 and Active Directory"

   DNS concepts: FQDN, HOSTS file, DNS name servers, recursion, forwarding,
   DNS: DDNS and DHCP. Split DNS.