16/ What port numbers do the following use?
ssh, ldap, ftp, smtp, X, named
17/ Using either tar or cpio detail the syntax to copy a directory structure from the /testA filesystem to the /testB filesystem.
18/ Why should you never have '.' in root's path?
19/ You can ping servers on the subnet your workstation is on, but not other subnets. What is wrong?
20/ If you can ping a server, but can't telnet or ssh to it, what could be the problem?
Please do not post your answers here. I'll post them in a couple of days' time.