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.