正确答案: D

在配置ISDN时，广域网协议不能封装成PPP，但可以封装成HDLC

题目：关于PPP和HDLC的说法中，错误的是（）

解析：D

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学习资料的答案和解析：

[单选题]OSI七层模型中，“段”是哪一层数据封装的名称（）

传输层

[单选题]对路由器的描述，正确的是（）

多广播域，单冲突域的设备

[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:

[多选题]How could the Ezonexam corporation benefit from using VLANs on their network?(Select three answer choices.)

VLANs allow access to network services based on department, not physical location.

VLANs establish segmented broadcast domains in switched networks.

解析：A,E,F 解析：Explanation:

[单选题]Your network uses the172.12.0.0 class B address. You need to support 459 hosts per subnet, while accommodating the maximum number of subnets. Which mask would you use?

255.255.254.0.

解析：解析：Explanation:Toobtain459hoststhenumberofhostbitswillbe9.Thiscansupportamaximumof510hosts.Tokeep9bitsforhostsmeansthelastbitinthe3rdoctetwillbe0.Thisgives255.255.254.0asthesubnetmask.