The difference between the industrial grade 4 g router and switch

now is information age, along with the progress of The Times, the Internet is an indispensable part of people's life. Often consists of many different types of computer network can be connected with the network interconnection. If several computer network is physically connected together, between them and can't communicate, then the 'interconnectivity' there is no practical significance. So often when it comes to 'interconnectivity', has been suggested that these interconnected computers can communicate, that is, from the function and the logical point of view, the computer network has formed a large computer networks, or Internet, can also be referred to as 'for the Internet, the Internet.

routers, switches,

router ( 路由器) Also called caliper, is realizes the interconnection devices in the network layer. It is much more complex than the bridge, also has more flexibility. Routers have stronger ability of heterogeneous network interconnection, including LAN and wan connection object. The router has two typical functions, namely data channel function and control function. Data channel features include forwarding decisions forward, back, and output link scheduling, etc. , are usually performed by specific hardware; General use software to realize control function, including the exchange of information between adjacent routers, system configuration, system management, etc.

switches ( 开关) Is a kind of based on MAC ( Network adapter hardware address) Recognition, can finish the package forwarding packets function of network equipment. Now switches are divided into: layer 2 switches, layer 3 switches or higher level switches. Layer 3 switches can also have the function of routing, and faster than low-end router forwarding rate. Its main features are: a routing and forwarding for many times.

network connected to each other using some intermediate devices ( Or intermediate system) , called relay system. The physical layer ( Is often said that the first layer, layer L1) Relay system, namely the repeater. The data link layer ( The second layer, layer L2) That bridge or bridge. The network layer ( The third layer, L3) Relay system, namely the industrial-grade 4 g router. A mixture of industrial grade 4 g router bridge and bridge breaker functions of both industrial grade 4 g router and bridge.

after the system is of the repeater, generally don't call it network interconnection, because this is just a network has been extended, but it is still a network. High-level gateway due to the complex, use less now. So discussing network interconnection is usually referred to use up to 4 g router switches and industrial-grade interconnected networks. This article mainly expounds switches and industrial grade 4 g router and its difference.

4 g industrial-grade routers and switches, the main difference manifests in the following aspects:

( 1) Working level different

the original switch is working in the data link layer of the OSI/RM open architecture, which is the second, the industrial grade 4 g router design work from the start in the network layer of the OSI model. Due to the switch is on the second floor of the OSI ( The data link layer) , so it works is simple, and industrial grade 4 g router to work in the OSI layer 3 ( The network layer) , you can get more protocol information, industrial grade 4 g router can make more intelligent forwarding decision.

( 2) The object which is the basis of the data forwarding different

switches physical address or MAC address is used to determine the destination address of the data forwarding. The industrial grade 4 g router is using different network ID number ( The IP address) To determine if data forwarding address. IP addresses are implemented in software, describes the equipment in the network, the layer 3 addresses are sometimes referred to as protocol address or web address. MAC address is usually bring their own hardware, the network card manufacturers to allocate, and curing has been to the network card, generally cannot be changed. And IP address is automatically assigned by the network administrator or system.

( 3) The traditional switches break up collision domains only, not divide broadcast domains; As 4 g router can divide broadcast domains

are connected by a switch network segment is still belong to the same broadcast domain, broadcast packets will spread in all switches connected on a network segment, in some cases can lead to communication congestion and security vulnerabilities. To connect to the industrial-grade 4 g routers on the segment will be allocated into different broadcast domains, broadcasting data is not through the industrial grade 4 g router. Although more than layer 3 switches VLAN function, can break up a broadcast domain, but between each broadcast domain can't communication, the communication between them still need industrial grade 4 g router.