IS420ESWBH2A  交换式集线器  具备自动寻址能力和交换作用

IS420ESWBH2A交换机，也称为交换式集线器，是一种在通信系统中完成信息交换功能的设备。 交换机通过对信息进行重新生成，并经过内部处理后转发至指定端口，具备自动寻址能力和交换作用。 交换机的主要功能包括物理编址、网络拓扑结构、错误校验、帧序列以及流控。 在计算机网络系统中，交换机是针对共享工作模式的弱点而推出的，它能有效地隔离广播风暴，减少误包和错包的出现，避免共享冲突。

IS420ESWBH2A交换机的主要特点包括：

IS420ESWBH2A交换机所有的端口都挂接在这条背部总线上，当控制电路收到数据包以后，处理端口会查找内存中的地址对照表以确定目的MAC（网卡的硬件地址）的NIC（网卡）挂接在哪个端口上，通过内部交换矩阵迅速将数据包传送到目的端口。

目的MAC若不存在，交换机才广播到所有的端口，接收端口回应后交换机会“学习”新的地址，并把它添加入内部地址表中。

交换机的过滤和转发功能使得它能够有效地减少冲突域，但不能划分网络层广播，即广播域。

交换机在同一时刻可进行多个端口对之间的数据传输。 每一端口都可视为独立的网段，连接在其上的网络设备独自享有全部的带宽，无须同其他设备竞争使用。

在实际应用中，IS420ESWBH2A交换机通常用于连接多个设备，如计算机、打印机、服务器等，以实现网络内的数据交换和通信。 常见的交换机类型包括以太网交换机、电话语音交换机、光纤交换机等。 交换机的配置和应用可以根据具体的网络需求和拓扑结构进行灵活调整。

总的来说，IS420ESWBH2A交换机是计算机网络系统中重要的设备之一，它通过对信息进行高效、准确的交换和转发，为网络内的设备提供了快速、稳定的数据通信服务。

IS420ESWBH2A  交换式集线器  具备自动寻址能力和交换作用

IS420ESWBH2A switch, also known as a switching hub, is a device that performs the function of information exchange in a communication system. The switch regenerates the information and forwards it to the specified port after internal processing, which has the automatic addressing capability and the exchange function. The main functions of the switch include physical addressing, network topology, error checking, frame sequence and flow control. In the computer network system, the switch is introduced for the weakness of the shared working mode, it can effectively isolate the broadcast storm, reduce the appearance of false packets and wrong packets, and avoid the sharing conflict.

Key features of IS420ESWBH2A switch include:

IS420ESWBH2A switch all ports are connected to this back bus, when the control circuit receives the packet, the processing port will look up the address mapping table in memory to determine the destination MAC (network card hardware address) of the NIC (network card) is connected to which port, through the internal exchange matrix quickly transmitted the packet to the destination port.

If the destination MAC address does not exist, the switch broadcasts to all ports. After receiving the response from the port, the switch learns the new address and adds it to the internal address table.

The filtering and forwarding function of the switch enables it to effectively reduce the conflict domain, but it cannot divide the network layer broadcast, that is, the broadcast domain.

The switch can transmit data between multiple port pairs at the same time. Each port can be regarded as an independent network segment, and the network devices connected to it enjoy all the bandwidth alone, without competing with other devices.

In practical applications, IS420ESWBH2A switches are often used to connect multiple devices, such as computers, printers, servers, etc., to achieve data exchange and communication within the network. Common types of switches include Ethernet switches, telephone voice switches, and Fibre Channel switches. The configuration and application of the switch can be flexibly adjusted according to the specific network requirements and topology.

In general, IS420ESWBH2A switch is one of the important equipment in the computer network system, which provides fast and stable data communication services for the devices in the network through the efficient and accurate exchange and forwarding of information.