正确答案: ABD

偷占带宽 提供拥塞管理机制 灵活的接入方式

题目：网络中经常使用“帧中继”服务，请选出帧中继的优点（）

解析：ABD

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举一反三的答案和解析：

[单选题]The network administrator has configured port security on a Ezonexam switch. Why would a network administrator configure port security on this Ezonexam device?

To prevent unauthorized hosts from getting access to the LAN

解析：解析：Explanation:

[单选题]关于静态NAT，下面（）说法是正确的。

静态NAT将内部地址一对一静态映射到内部全局地址

[单选题]对于运行OSPF协议的路由器来说，RouterID是路由器的唯一标识，所以协议规定：必须保证RouterID在如下范围之内唯一（）。

自治系统内

[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:

[单选题]When is a switched network that is running the Spanning Tree Protocol considered to be fully converged?

when every operating switch port is in either the blocking or forwarding state

解析：解析：Explanation: