IBM(000-236)单项选择题每日一练(2018.10.22)

单项选择题
An administrator has provided a 24 bit netmask. Which of the following options indicates the number of host addresses that are available in a network？（）
A.24
B.126
C.128
D.254
单项选择题
A machine must have the most direct access possible to two different networks. However， it cannot act as a router between the networks. Which of the following arrangements is most appropriate to facilitate the machine’s accessibility？（）
A.ipforwarding turned on and two adapters
B.One adapter， with a route to a default gateway
C.An adapter in each network， and ipforwarding off
D.An adapter in each network， with a route only to the default gateway
单项选择题
Which of the following files should contain the statement "hosts=local， bind"？（）
A./etc/hosts
B./etc/irs.conf
C./etc/netsvc.conf
D./etc/resolv.conf
单项选择题
A host is expected to be a mail relay or receiving endpoint. Which of the following daemons should be listening for connections on port 25？（）
A.ftpd
B.imapd
C.pop3d
D.sendmail
单项选择题
The statement： "search austin.ibm.com raleigh.ibm.com" belongs in which of the following files？（）
A./etc/hosts
B./etc/irs.hosts
C./etc/resolv.conf
D./etc/netsvc.conf