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问题 问答题

在二纤单向通道保护环（1十1方式）、二纤双向复用段共享保护环、四纤双向复用段共享保护环中，发生故障时仅需要在一侧倒换的是哪种保护环？

答案

参考答案：

二纤单向通道保护环（1十1方式）。

单项选择题

SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment. A varietion of the (71) protocol called NRM is essentially the same as SDLC. SDLC is (72) protocol like HDLC, Frame Relay or X.25.An SDLC network is made up of (73) that controls all communications, and (74) . It is capable of (75) operation, but almost all practical applications are strictly half duplex.

（72）是（）

A. a peer to peer

B. a point-to-point

C. not a peer to peer

D. a peer to peers
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问答题 简答题

在第一次拜访中，建立客户信赖的关键点有哪些？
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