单项选择题

Which of the following class addresses is reserved for multicast？（）

A. Class A
B. Class B
C. Class C
D. Class D

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单项选择题

Which of the following commands will NOT determine the slot location of an Ethernet adapter in a system？（）

A.lsattr -El
B.lsdev -C
C.prtconf
D.lscfg -l

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 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