With regard to Layer 3 switches and routers, they are currently widely used in various fields, including hubs (hubs). The following is a detailed analysis of the differences between the three. The reason why some people are confused about the difference between a layer 3 switch and a router is that the layer 3 switch also has a "routing" function, which is consistent with the routing function of a traditional router. Nonetheless, there are still substantial differences between Layer 3 switches and routers, which are introduced below.
1. The main functions are different
Both Layer 3 switches and routers have routing functions. The main function of the router is still the routing function, but its other functions are nothing but additional functions. The three-layer switch is still a switch product, but it is a switch with some basic routing functions, and its main function is still data exchange. In other words, it has both data exchange and routing routing functions, but its main function is still data exchange; and the router has only one main function of routing and forwarding.
2. The main applicable environment is different
The three-layer switch is mainly connected to a simple local area network, while the router is connected to a more complex network of various types. The routing function of Layer 3 switches is usually relatively simple, and the routing path is far less complicated than routers. It is mainly faced with a simple local area network connection. Its main use in LAN is to provide fast data exchange function to meet the characteristics of frequent data exchange in LAN.
The router is different. Its design is to meet different types of network connections. Its routing function is more reflected in the interconnection between different types of networks, such as the connection between LAN and WAN, and the network of different protocols. Connection, etc., so routers are mainly used between different types of networks. Its main function is routing and forwarding, and it is its ultimate purpose to solve the connection of various complex routing paths. Therefore, the routing function of routers is usually very powerful. It is not only applicable to LANs with the same protocol, but also suitable for different protocols. Between LAN and WAN. Its advantage lies in choosing the best route, load sharing, link backup and routing information exchange with other networks, etc. Router has the functions. In order to connect with various types of networks, the interface types of routers are very rich, and layer 3 switches are generally only the same type of LAN interface, which is very simple.
3. Performance is different
Technically speaking, there is a clear difference between the router and the layer 3 switch in data packet switching operations. The router is generally executed by the microprocessor-based software routing engine to perform data packet switching, while the three-layer switch performs data packet switching through hardware. After routing the first data flow, the layer 3 switch will generate a mapping table of MAC addresses and IP addresses. When the same data flow passes again, it will directly pass from the layer 2 according to this table instead of routing again. , Which eliminates the network delay caused by router routing and improves the efficiency of data packet forwarding. At the same time, the routing lookup of the layer 3 switch is directed to the data stream. It uses cache technology and is easily implemented using ASIC technology. Therefore, it can greatly save costs and achieve fast forwarding. The forwarding of the router uses the longest matching method, which is complicated to implement, and is usually implemented by software, and the forwarding efficiency is low.
Because of this, compared with the overall performance, the performance of the layer 3 switch is much better than that of the router, which is very suitable for the LAN with frequent data exchange; and although the router has a very powerful routing function, its packet forwarding efficiency is much lower than Layer 3 switches are more suitable for the interconnection of different types of networks where data exchange is not very frequent, such as the interconnection of LAN and Internet. If routers, especially high-end routers are used in LAN, it is a waste to a considerable extent (in terms of its powerful routing function), and it can not meet the communication performance of LAN well
The difference between hub and switch
1. A hub is a form of repeater. It works at the physical layer, and like repeaters, it is often used for two-way forwarding of physical signals between two network nodes. Complete the signal copy, adjustment and amplification functions. The difference is that the hub can provide multi-port services. In the process of data transmission. Because of blocking, delay and other reasons. There will be short frames, fragments, etc. From the ISO physical system, hub belongs to the physical layer of equipment. The physical layer provides a basic mechanism for encoding (transmitting to the physical medium) and decoding (receiving from the physical medium) binary data (bits). The physical layer also defines the physical connection mechanism with the medium, but not the medium itself. Therefore, the hub only synchronizes, amplifies, and reshapes the data, while the short frames and fragments in the data process cannot be processed.
2. A switch (SWITCH) is similar to a hub and can connect two LAN segments. It works at the data link layer and can play the role of filtering frames. SWITCH detects the source and destination addresses of the frame. If it is in the same network segment, it will not be forwarded. If it is not in the same network segment, it will forward the frame to another network segment.
SWITCH works at the data link layer. This layer provides a frame consisting of information bits. The frame consists of a header or header bits containing a start flag, addressing information and (for LAN) a 32-bit cyclic redundancy code (CRC). The role of CRC is to ensure the integrity of the frame when the information bits pass through the physical medium. The data link layer also provides link management. For Ethernet, frames are transmitted when the channel is idle and stopped when a collision is detected. In the token ring network. When a free token is received, the frame is transmitted. Therefore, the switch can not only synchronize, amplify, and shape the data, but also effectively filter short frames and fragments. The hub adopts the shared bandwidth working mode, and the switch is exclusive to the bandwidth.
For more router settings, please visit http: //
Outdoor Led Display,Outdoor Led Wall Display,Outdoor Led Walls,Outdoor Led Diigital Display
ALLIN , https://www.displayapio.com