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.

单项选择题Whichofthefollowingcablesisthemostsusceptibletophysicaldamagebyroughhandling？（）

A.Coaxial
B.Fiber optic
C.Cat 3 UTP
D.Cat 5 UTP

单项选择题Whichofthefollowingcommandsisusedtoobservethecurrentstateoftheroutingtable？（）

A.route
B.lsattr
C.netstat
D.ifconfig

单项选择题Anetworkadministratorhasa10base2network.Acardisprovidedthathasboth10base2and10base5ports.WhichofthefollowingtypesofcablesshouldbeselectedinSMITduringconfigurationoftheadapter？（）

A.TP
B.BNC
C.DIX
D.CAT5

单项选择题WhichofthefollowingfilesshouldbeusedtoaltertheorderofwhichDNSserversgetqueriedfirst？（）

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

单项选择题Whenchoosingahostname，othermachineswillassociatethenamewith（）。

A.the IP address
B.the MAC address
C.inetd
D.port 80