正确答案: A

比特

题目：OSI七层模型中，物理层的数据封装名称为（）

解析：A

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举一反三的答案和解析：

[单选题]The corporate head office of Ezonexam has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their destination out of sequence, what will happen?

UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.

解析：解析：Explanation:

[单选题]基本IP访问权限表的表号范围是：()

1-99

[单选题]Ezonexam has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?

VTP will allow switches to share VLAN configuration information

[单选题]备份路由器IOS的命令是：()

copy flash tftp

[单选题]当配置一个CISCO的路由器时，缺省的DR和BDR优先级是（）。

1

[单选题]A new Ezonexam switch is installed into an existing LAN and a new VTP trunk is set up with an existing switch. Which VLANs will be allowed on this new trunk?

All defined VLANs are allowed on the trunk by default.

解析：解析：Explanation:

[单选题]标准访问控制列表应被放置的最佳位置是在（）。

越靠近数据包的目的地越好

[单选题]IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP地址所在子网的广播地址为（）

192.168.50.71

[多选题]交换机的三大功能为（）

地址学习

转发过滤

消除回路

解析：ABC