21. what system file contains definitions of well known ports, their associated services and protocols? a. /etc/services b. /etc/sysconfig/network-scripts c. /etc/services.conf d. /etc/inet/hosts e. none of the choices
22. what is a well-known service that binds port 25 and is it required on all hosts? a. snmp and it should be turned off if not needed. b. smtp and it is a required service. c. smtp and it is only required on mx hosts. d. slpd and it is required if you run ldap services. e. sshd and it is required for secure logins.
23. your machine has two working nic's with proper addresses. you want to split your network into two new subnets. what single command will accomplish this? a. ifconfig b. route c. default d. netstat e. none of the choices
24. what directory be default contains the delivered mail for each user? a. ~/mail/ b. /usr/mail/ c. /var/mail/ d. /var/mail/spool/ e. /var/spool/mail/
25. you are running an email server configured with the default settings. in which directory will you found the delivered mail for the user foo? a. /var/spool/mail b. /home/foo/mail c. /var/mail/spool d. /var/users/mail
