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Features Of Routers

Shenzhen Hongdian Corporation | Updated: Aug 21, 2017

Routers have two typical functions, namely data channel function and control function. Data channel function includes forwarding decision, back-panel forwarding and output link scheduling, which is usually done by specific hardware, and the control function is generally realized by software, including information exchange, System configuration and system management between neighboring routers.

Routers mainly have the following functions:

First, network interconnection, routers support a variety of LAN and WAN interfaces, mainly for interconnection LAN and WAN, to achieve different network communication;

Second, data processing, including packet filtering, packet forwarding, priority, multiplexing, encryption, compression and firewall functions;

Third, the network management, the router provides including configuration management, Router performance management, fault tolerant management and traffic control functions.

In order to complete the "routing" work, in the router holds the various transmission path related data--routing table (Routing table), for routing use. The routing table holds information about the subnet's flag, the number of routers on the network, and the name of the next router. The routing table can be fixed by the system administrator, can also be dynamically modified by the system, can be automatically adjusted by the router, Router or can be controlled by the host. There are two names in the router about addresses: Static routing tables and dynamic routing tables. A fixed routing table is called a static (static) routing table in advance by a system administrator, Router usually in the case of a system installation that is pre-set according to the configuration of the network, and it will not change with the future network structure. Dynamic routing table is a routing table that routers automatically adjust according to the operation of the network system. According to the functions provided by the Routing Protocol (Routing Kyoto), Router the router automatically learns and remembers the network operation and calculates the optimal path of data transmission when needed.

The main function and working principle of the router.

This paper introduces the concept of routing and the process of routing and data forwarding, grasps the basic knowledge of routing in Network Interconnection, and grasps the working principle of routers.

Routers and their basic function routers (Router) are devices that interconnect networks. If the role of the switch is to achieve the computer, server and other equipment interconnection, Router so as to build local network, then the role of routers is to achieve network and network interconnection, thus forming a larger network.

Routers work at the network layer of the TCP/IP network model and correspond to the third layer of the OSI seven-layer network reference Model, so routers are often called network layer interconnect devices. The main function and basic functions of routers are as follows:

1. Connect the network: large enterprises in different regions of the local area network through a router to connect together can build enterprise wide area network. Computer users within the enterprise LAN to access the Internet (Internet), you can use the router to connect the LAN to the ISP (Internet Service Provider) network to achieve connectivity and shared access to the global Internet. In fact, Router the internet itself is a massive global public information network made up of tens of thousands of routers connected to each other.

2. Isolate the Ethernet broadcast: The switch sends the broadcast packets to each port, and a large number of broadcasts can seriously affect the transmission efficiency of the network. The number of broadcast packets in the network will soar as a result of a hardware damage or a virus attack on a device such as a network card, Router causing a broadcast storm to block or paralyse the network transmission. Routers can isolate broadcasts. Each port of the router can be treated as a separate network that restricts the broadcast package to the network to which the port is connected and not to the network to which other ports are connected

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