营销文学可以称之为第二层交换机，但开关没有确切的定义。
Marketing literature may call it a layer 2 switch, but a switch has no precise definition.
MAC地址表是以太网二层交换机中的一个重要数据结构，对MAC地址的学习和查找是实现以太网二层交换的必需功能。
The address table of MAC is an important data structure in the Ethernet two-layer switch. When the switch exchanges the information, it must study and Find the MAC address with the MAC address table.
本文以协议的形式提出了一种新的以太网交换机集群管理方案，将二层交换机和三层交换机的集群管理无缝地结合在一起。
In this paper, a new cluster management system is described by proposing a new protocol, with this protocol layer 2 and layer 3 switches can be managed in a cluster system seamlessly.
从技术上讲，网络交换机工作在OSI模型的第二层（数据链路层）。
Technically, network switches operate at layer two (Data Link Layer) of the OSI model.
三层交换技术将传统的二层转发和路由技术结合起来，特别适合汇聚层的需要。
The layer 3 switch technology which fits for the need of aggregation layer is a combination of the layer 2 switch technologies and routing.
物理网络拓扑从第二层反映出交换机之间的连接关系，它在网络管理系统中具有重要的地位。
Discovering physical network topology is an important function of network management system because it depicts links between switches at layer2.
例如，若某台多层交换机支持ip协议，ipx包则只能在第二层上交换，不能在第三层上规定路由。
For example, if a multilayer switch supports IP, then IPX packets can only be switched at layer 2 not routed at layer 3.
用什么办法可以实施思科交换器的二层安全特性？
Which two methods are examples of implementing Layer 2 security on a Cisco switch? Choose two.
用什么办法可以实施思科交换器的二层安全特性？
Which two methods are examples of implementing Layer 2 security on a Cisco switch? Choose two.
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