单项选择题
In the implementation of VLSM techniques on a network using a single Class C IP address, which subnet mask is the most efficient for point-to-point serial links（）。
A.255.255.255.0
B.255.255.255.240
C.255.255.255.248
D.255.255.255.252
E.255.255.255.254
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判断题
OSI中，链路层和传输层都是面向连接的，但链路层建立的是点到点的连接，传输层建立的是端到端的连接。 -
单项选择题
IP地址与它的掩码取反相与，所得的非零点分十进制数是此IP地址的（）。
A.A类
B.主机地址
C.网络地址
D.解析地址 -
单项选择题
While troubleshooting a connectivity problem, a network administrator notices that a port status LED on a Cisco Catalyst series switch is alternating green and amber. Which condition could this indicate（）。
A.The port is experiencing errors
B.The port is administratively disabled
C.The port is blocked by spanning tree
D.The port has an active link with normal traffic activity
