正确答案:

题目：网络172.12.0.0需要划分子网，要求每个子网中有效IP数为458个，为了保证子网数最大，则掩码应为（）

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举一反三的答案和解析：

[单选题]交换机工作在OSI七层模型的哪一层()

数据链路层

[单选题]On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously, resulting in a collision. Following this collision, what will the hosts do? (Select all valid answers)

The hosts will attempt to resume transmission after a time delay has expired.

解析：C 解析：Explanation:

[单选题]RIP协议的管理距离是（）

110

[单选题]After working all night and successfully configuring a Cisco router for the Ezonexam network you save your changes on the startup config, reboot the router, and go out for a cigarette. When you return, none of your changes are active and the router boots to the initial configuration mode! Which of the choices below indicates the source of your problem?

Router configuration-register set to bypass startup configuration

解析：解析：Explanation:

[多选题]网络中经常使用“帧中继”服务，请选出帧中继的优点（）

偷占带宽

提供拥塞管理机制

灵活的接入方式

解析：ABD

[单选题]路由表中，某条路由的“路由代码为D”，则表明该路由为（）

EIGRP路由

[单选题]RIP协议负载均衡的路径数量为（）

最多6条

[单选题]The Ezonexam LAN is upgrading all devices to operate in full duplex. Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?

Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth