用于路由选择及高速转发的，提供优化、可靠的骨干传输结构的交换机是（ ）。
- A.核心层
- B.汇聚层
- C.接入层
- D.传输层
正确答案及解析
正确答案
解析
在信息网络系统的建设中，基于应用层次、处理能力和可靠性要求，一般将交换机分为核心交换机、汇聚层交换机和接入层交换机三类。核心层交换机的主要功能是用于路由选择及高速转发的，提供优化、可靠的骨干传输结构，因此核心层交换机应用有更高的可靠性和吞吐量。汇聚层交换机采用交换能力较强的设备，汇聚层设备是相对数据量比较大的地方，所以汇聚层的设备连接子节点比较多的地方，应配备交换和路由能力比较强的设备。接入层交换机直接连接用户，其主要功能是为最终用户提供网络接入，所以要具有高性能、高端口密度且易于安装的特性。
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