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The Difference Between An Ethernet Switches And A Router
Jul 25, 2017

  The difference between an Ethernet Switches and a router

  (1) the work level is different

  The same time as

  The initial switch is the data link layer of the OSI / RM open architecture, which is the second layer, Ethernet Switches and the router is designed to work at the network layer of the OSI model. Because the switch works on the second layer (data link layer) of the OSI, it works relatively well, and the router works on the third layer (network layer) of the OSI, and can get more protocol information. The router can make More intelligent forwarding decisions.

  The same time as

  (2) Data forwarding is based on different objects

  The switch uses the physical address or MAC address to determine the destination address of the forwarding data. And the router is the use of different network ID number (ie IP address) to determine the data forwarding address. Ethernet Switches IP address is implemented in the software, describes the network where the device is located, and sometimes the third layer of the address is also called the protocol address or network address. MAC address is usually hardware comes by the network card manufacturers to allocate, and has been cured to the card to go, in general, can not be changed. The IP address is usually automatically assigned by the network administrator or the system.

  (3) the traditional switch can only split the conflict domain, can not split the broadcast domain; and the router can split the broadcast domain

  The network segments connected by the switch still belong to the same broadcast domain. Broadcast packets are propagated on all network segments connected to the switch, which in some cases can lead to traffic congestion and security vulnerabilities. The network segments connected to the router are assigned to different broadcast domains, and the broadcast data does not pass through the router. Although the third layer of the switch has a VLAN function, you can also split the broadcast domain, but between the sub-broadcast domain is not communication between the exchange between them still need a router.

  (4) the router provides a firewall service

  The router only forwards packets of specific addresses, does not transmit packets that do not support routing protocols, Ethernet Switches and transmit packets of unknown target networks, thus preventing broadcast storms.

  Switch is generally used for LAN-WAN connection, the switch belongs to the bridge, is the data link layer equipment, some switches can also achieve the third layer of the exchange. The router is used for WAN-WAN connections, which can solve the forwarding of packets between heterosexual networks and act on the network layer. They only accept input packets from one line and then forward to another line. These two lines may belong to different networks and use different protocols. In contrast, the router's function is more powerful than the switch, but the speed is relatively slow, expensive, Ethernet Switches the third layer switches both wire-speed forwarding packet capacity, but also a good control of the router function, it can be widely used.