Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN?

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问题 Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN?

选项 A、HDLC
B、Ethernet
C、Token Ring
D、PPP
E、Frame Relay

答案A,D,E

解析连接到WAN，有三种连接方式：专线连接，电路交换和包交换。专线使用同步串行线，他的二层的封装协议常用的有：HDLC，PPP；电路交换使用同步串行线，他使用的二层的封装协议有：HDLC，PPP包交换使用的是虚电路（VC），而VC又分为PVC（永久虚电路）和SVC（交换虚电路），他使用的二层的封装协议有：X．25， Frame-relay，ATM。

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Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN?

思科640802

思科认证

ReadthefollowingtextcarefullyandthentranslatetheunderlinedsegmentsintoChinese.Yourtranslationshouldbewrittencl

Herearesomemanagementtoolsthatcanbeusedtohelpyouleadapurposefullife.1.UseYourResourcesWisely.Yourdecisi

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Thegreatrecessionmaybeover,butthiseraofhighjoblessnessisprobablybeginning.Beforeitends,itwilllikelychanget

TodayweliveinaworldwhereGPSsystems,digitalmaps,andothernavigationappsareavailableonoursmartphones.【B1】______

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