A、下游按需
B、下游自主
C、两种都可以
D、以上都不是

A、10s
B、15s
C、30s
D、60s

A、86.0010.0100.2303.4005.00
B、86.0010.0102.2303.4005.00
C、86.0010.0102.3003.4005.00
D、86.0010.0102.030

A、FTP
B、TELNET
C、WWW
D、TFTP

A.192.168.102.255
B.192.168.102.127
C.192.168.102.117
D.192.168.102.111

A.255.255.255.248
B.255.255.255.224
C.255.255.255.240
D.255.255.255.192

A.192.168.102.0
B.192.168.102.32
C.192.168.102.64
D.192.168.102.96

A.10.25.1.0/255.255.255.0
B.145.25.1.0/255.255.255.0
C.192.168.1.0/255.255.255.0

A.提供应用程序网络接口
B.建立端到端的连接
C.寻址和路由选择
D.物理介质访问

A.千兆，单模光纤
B.千兆、多模光纤
C.千兆，超5类UTP线
D.千兆，同轴电缆

A.表示层
B.会话层
C.网际层
D.网络访问层