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The Ethernet Switch Works On The Second Layer Of The OSI
Jun 05, 2017

  The main differences between routers and Ethernet switches are reflected in the following areas:

  (1) different levels of work - the original Ethernet switch is working in the OSI / RM open architecture data link layer, which is the second layer, and the router began to work in the OSI model of the network layer.

  Because the Ethernet 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 smarter forwarding decisions.

  (2) Data forwarding is based on different objects - Ethernet switch is to use 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.

  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 Ethernet switch can only split the collision domain, can not split the broadcast domain; and the router can split the broadcast domain - the Ethernet switch connected to the network segment is still the same broadcast domain, the broadcast packet will be in the Ethernet switch Connected on all segments of the network, in some cases will lead to communication congestion and security vulnerabilities.