计算机英语习题PPP was clearly designed to be implemented in softwar

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计算机英语习题
PPP was clearly designed to be implemented in software,not in hardware as HDLC nearly always is.With a software implementation,working entirely with bytes is much simpler than working with individual bits.In addition,PPP was designed to be used with modems,and modems accept and transmit data in units of 1 byte,not 1 bit.
这个答案原题是：PPP基本上以HDLC为基础.HDLC使用了位填充技术来防止在净荷数据中偶尔出现标志字节,以避免混淆.请给一个理由说明为什么PPP却使用了字节填充技术!

PPP 显然是用于软件的操作,不像HDLC等基本上是用于硬件.通过使用这种软件,相对于单个字节的操作来说工作就简单多了.另外,PPP还可以用于调制解调器,调制解调器接受和传输数据是以每字节为单位的,而不是像过去的二进制那样以比特即位作为传输单位.

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