单项选择题

A class B network 129.35 has 4 subnets and a netmask of 255.255.252.0 （11111111.11111111.11111100.00000000）. To which of the following subnets will the class B network deliver a packet of address 129.35.14.04 （10000001.00100011.00001110.00000100）？（）

A.129.35.12.0
B.129.35.16.0
C.129.35.52.0
D.129.35.128.0

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单项选择题

A network administrator provides an IP address of 128.135.0.142 and a subnet mask of 255.0.0.0. Once a ping is attempted， it fails. Which of the following options is the most probable cause of the failed ping？（）

A.0 is not valid in an IP address
B.128 is a reserved network
C.The subnet mask should be 255.255.0.0. since it is a class B
D.A network problem has occurred since IP and subnet are valid

单项选择题

Which of the following options is representative of a Class B address？（）

A.128.55.103.2
B.195.201.22.11
C.227.100.100.1
D.120.102.27.120

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.Check to see if there is an a.out file on remote host Saturn.
2.Change to the /u/new directory on Earth.
3.Transfer a.out from Earth to Saturn.

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