MACH104-20TX-FR  交换机  通信系统中完成信息交换功能

MACH104-20TX-FR  交换机是一种在通信系统中完成信息交换功能的设备。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。交换机的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。

简单来说，MACH104-20TX-FR  交换机是一种用于电信号转发的网络设备，它能把用户线路、电信电路和其他要互连的功能单元根据单个用户的请求连接起来。它可以为接入交换机的任意两个网络节点提供独享的电信号通路。

MACH104-20TX-FR  交换机的内部有一个地址表，这个表标明了MAC地址和交换机端口的对应关系。交换机能够读取数据包中的MAC地址信息，并根据MAC地址来进行交换，且每个端口都独享带宽。作为高性能的集线设备，交换机已经逐步取代了集线器而成为局域网的关键设备。

此外，MACH104-20TX-FR  使用交换机也可以把网络“分段”，通过对照MAC地址表，交换机只允许必要的网络流量通过交换机。通过交换机的过滤和转发，可以有效的隔离广播风暴，减少误包和错包的出现，避免共享冲突。

MACH104-20TX-FR  交换机和路由器在多个方面存在明显的区别。

工作层次：交换机工作在数据链路层，而路由器则工作在网络层。

地址寻址：交换机根据MAC地址寻址，而路由器则根据IP地址寻址。此外，路由器可以处理TCP/IP协议，而交换机则不可以。

主要功能：交换机主要用于组建局域网，而路由器的功能是将由交换机组好的局域网相互连接起来，或者接入Internet。路由器还可以提供防火墙的功能，而交换机则不能。

数据转发：路由器仅仅转发特定地址的数据包，不传送不支持路由协议的数据包传送和未知目标网络数据包的传送，从而可以防止广播风暴。

虚拟拨号：路由器具有虚拟拨号功能，通过同一台路由器上网的电脑是共用一个宽带账号，大家上网要相互影响。而交换机则没有这个功能，大家上网是分别拨号，各自使用自己的宽带，大家上网没有影响。

MACH104-20TX-FR  交换机  通信系统中完成信息交换功能

MACH104-20TX-FR  交换机  通信系统中完成信息交换功能

MACH104-20TX-FR switch is a device that completes the function of information exchange in a communication system. In the computer network system, the switch is introduced for the weakness of the shared working mode. All ports of the switch are connected to this back bus, when the control circuit receives the data packet, the processing port will look up the address mapping table in memory to determine the destination MAC (network card hardware address) NIC (network card) is connected to which port, through the internal exchange matrix quickly transmitted the data packet to the destination port.

In simple terms, the MACH104-20TX-FR switch is a network device for electrical signal forwarding, which can connect user lines, telecommunications circuits and other functional units to be interconnected according to the request of a single user. It can provide an exclusive electrical signal path for any two network nodes of the access switch.

The MACH104-20TX-FR switch has an address table inside, which indicates the correspondence between MAC addresses and switch ports. The switch can read the MAC address information in the packets and exchange according to the MAC address, and each port has its own bandwidth. As a high-performance hub equipment, the switch has gradually replaced the hub and become the key equipment of the LAN.

In addition, the MACH104-20TX-FR can also "segment" the network using the switch, by referring to the MAC address table, the switch allows only necessary network traffic through the switch. By filtering and forwarding switches, broadcast storms can be effectively isolated, reducing the occurrence of false packets and incorrect packets, and avoiding sharing conflicts.

The MACH104-20TX-FR switch and router are clearly different in several ways.

Level of work: Switches work at the data link layer, while routers work at the network layer.

Address addressing: Switches address by MAC address, while routers address by IP address. In addition, routers can handle TCP/IP protocols, while switches cannot.

Main functions: The switch is mainly used to build a local area network, and the function of the router is to connect the local area network good by the switch unit to each other, or access the Internet. A router can also provide the functions of a firewall, while a switch cannot.

Data forwarding: The router only forwards packets of specific addresses, and does not transmit packets that do not support routing protocols and packets of unknown destination networks, thus preventing broadcast storms.

Virtual dial-up: The router has a virtual dial-up function, and the computers accessing the Internet through the same router share a broadband account, and we should interact on the Internet. The switch does not have this function, everyone is dial-up, each using their own broadband, everyone has no impact on the Internet.