使用ADSL接入Internet，用户端需要安装（ ）协议。
- A.PPP
- B.SLIP
- C.PPTP
- D.PPPoE
正确答案及解析
正确答案
解析
ADSLModem上网拨号方式有3种，即专线方式（静态IP）、PPPoA和PPPoE。
PPPoE（英语：Point-to-PointProtocolOverEthernet），以太网上的点对点协议，是将点对点协议（PPP）封装在以太网（Ethernet）框架中的一种网络隧道协议。
PPTP（Point-to-PointTunnelingProtocol），即点对点隧道协议。该协议是在PPP协议的基础上开发的一种新的增强型安全协议，支持多协议虚拟专用网（VPN），可以通过密码验证协议（PAP）、可扩展认证协议（EAP）等方法增强安全性。可以使远程用户通过拨入ISP、通过直接连接Internet或其他网络安全地访问企业网。
SLIP（SerialLineInternetProtocol，串行线路网际协议），该协议是Windows远程访问的一种旧工业标准，主要在Unix远程访问服务器中使用，现今仍然用于连接某些ISP。
PPP（点到点协议）是为在同等单元之间传输数据包这样的简单链路设计的链路层协议。这种链路提供全双工操作，并按照顺序传递数据包。设计目的主要是用来通过拨号或专线方式建立点对点连接发送数据，使其成为各种主机、网桥和路由器之间简单连接的一种共通的解决方案。
因此本题选择D选项。
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