Which of the following Class A networks is reserved for "private networks" use only？（）

单项选择题WhichofthefollowingoptionsisavalidhostIPaddress？（）

A.129.0.0.99
B.129.255.0.1
C.224.0.0.1
D.254.0.0.1

单项选择题Whichofthefollowingcommandsshouldbeusedtolistalloftheactivenetworkinterfacesonasystem？（）

A.lscfg
B.route
C.netstat
D.entstat

单项选择题Thestatement： searchaustin.ibm.comraleigh.ibm.com belongsinwhichofthefollowingfiles？（）

A./etc/hosts
B./etc/irs.hosts
C./etc/resolv.conf
D./etc/netsvc.conf

单项选择题WhichofthefollowinginterfacesisappropriateforanEthernetadapterthatisconfiguredasstandardEthernet？（）

A.et0
B.at0
C.sa0
D.en0

单项选择题The local host on a small network is named Earth. There is also a remote host on the network named Saturn.  The system administrator of the network is in the  u tmp directory of Earth， and starts an ftp to Saturn as root.  Which of the following sequence of commands issued from the local host， Earth， will：（）。 1.Change to the  u new directory on Saturn.   2.Check to see if there is an a.out file on remote host Saturn. 3.Transfer a.out from Earth to Saturn.

A.cd /u/new ls a.out put a.out
B.cd /u/new ls a.out get a.out
C.lcd /u/new ls a.out put a.out
D.lcd /u/new ls a.out get a.out