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.页码：[1] [2] [3] [4] [5] [6] 第1页、共6页 |
