工程师为某公司设计了如下网络方案。
下面关于该网络结构设计的叙述中，正确的是（ ）。
- A.该网络采用三层结构设计，扩展性强
- B.S1、S2两台交换机为用户提供向上的冗余连接，可靠性强
- C.接入层交换机没有向上的冗余连接，可靠性较差
- D.出口采用单运营商连接，带宽不够
正确答案及解析
正确答案
解析
本题考查网络设计部署的基本知识。
根据图示的拓扑链接可见，该网络规划采用的是两层结构的扁平化设计方式，而两台核心层交换机 S1、S2之间并未提供冗余连接，这样的连接方式，会造成很严重的单点故障，因此不能为整个网络提供较高的可靠性。Internet 接入采用单运营商接入的方式，并不能够导致带宽不够的问题，而接入层向核心层并未提供冗余连接，网络的可靠性较差。
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