[单选题]From where does a small network typically get its IP network addresses or IP block?

正确答案 ：C

From the Internet Service Provider (ISP)

解析：解析：Explanation:

[单选题]扩展ACL和标准ACL的区别（）。

正确答案 ：B

扩展的ACL核查数据包的源地址和目标地址和端口号

[单选题]Given that you have a class B IP address network range, which of the subnet masks below will allow for 100 subnets with 500 usable host addresses per subnet?

正确答案 ：C

255.255.254.0

解析：解析：Explanation:

[单选题]配置路由器特权用户“加密密码”的命令是：()

正确答案 ：C

enable secret

[单选题]OSPF骨干区的区域编号为（）

正确答案 ：C

0.0.0.0

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