What is network interconnection technology
Source: Shangpin China |
Type: website encyclopedia |
Time: June 21, 2014
With the rapid development of computer technology, network technology and communication technology, a single network environment can no longer meet the needs of society for information networks. Usually, two or more computer networks need to be connected physically and logically through equipment to achieve extensive resource sharing and information exchange. The success of the Internet proves that computers Website production People are paying more and more attention to interconnection. There are two levels of network connection in computer network: one is the connection of physical lines between networks; The other is the physical and logical connection between networks. Both can realize the communication between network protocols. Generally speaking, the network connection refers to the latter, that is, the physical and logical connection between the networks or networks distributed in different geographical locations and remote workstations through corresponding technical means, so as to form a larger computer network system and achieve a greater range of resource sharing and file sharing. 1. Necessity of network interconnection
1) Although ISO/OSI has been around for many years, there are still a large number of non osl networks in actual operation, and various existing specific networks do not necessarily use the OS1 7-layer model. 2) The communication subnets adopted by OSI and the existing network products determine that various types of communication subnets will coexist all the time. 3) Network interconnection can improve network performance. ① Improve the reliability of the system. ② Improve system performance. ③ Increase system confidentiality. ④ Convenient network construction. ⑤ Increase geographical coverage. With the promotion of business demand, especially the popularity of Internet, network interconnection technology has become the key technology to realize large-scale communication and resource sharing such as Internet. 2. Basic principles of network interconnection Network interconnection for different purposes can be realized in different network layers. Because there are different differences between networks, different network interconnection devices are needed to connect each network. According to the working level of network interconnection equipment and the protocols it supports, the equipment between networks can be divided into repeaters, bridges, switches, routers and gateways, as shown in Figure 8-4. (1) Repeater The inter network equipment working in the physical layer is mainly the repeater, which is used to expand the length of network transmission and realize the electrical connection between two identical LAN segments. It merely copies the bit stream from one physical network segment to another, regardless of the network protocol (such as TCP/IP, IPX/SPX, NETBIOS, etc.) used by the network. The interconnection protocol of the physical layer is the simplest, and the interconnection standards are mainly formulated by EIA, ITU-T, IEEE and other institutions. (2) Switches and bridges (bridges) The switch or bridge can connect two or more network segments. If the information is not sent to the network segment connected by the bridge, the bridge can filter it out to avoid the bottleneck of the network. LAN connection is actually the interconnection of MAC sublayer MAC bridge standards are developed by various subcommittees of IEEE 802. (3) Router The inter network equipment working in the network layer is mainly routers. Routers provide network layer interfaces between various networks. They are active and intelligent network nodes. They participate in network management, provide routing of data between networks, and dynamically control network resources. Routers are protocol dependent. They must support a certain protocol, such as IP, IPX, etc. Kinds of routers and routing protocols are Jingduo, whose standards are mainly formulated by ANSI task group X353.3 and ISO/IEC working group TCI/SC6/W G2. (4) Gateway The equipment between networks working above the third layer is called gateway. Its function is to connect two or more different networks so that they can communicate with each other. This "difference" often means that the physical network and the high-level protocol are different, and the gateway must provide mutual conversion of protocols between different networks. The most common example is to connect a particular kind of LAN or WAN with a special network architecture. 3. Types of network interconnection (1) LAN-IAN interconnection It belongs to the relatively close IAN interconnection, such as the campus network (between buildings) and the interconnection between floors and ANs. Homogeneous network interconnection: refers to the interconnection of LAN with the same protocol. Common equipment include repeaters, hubs, switches, bridges, etc. Heterogeneous network interconnection: refers to the interconnection of two LAN with different protocols. Commonly used devices include bridges, routers, etc. (2) LAN WAN interconnection The interconnection of LAN and WAN in a small area is mainly used to solve the network interconnection between several adjacent floors or buildings within a small test area, as well as within an organization, which expands the connection range of data communication and enables the LAN of different units or institutions to connect to a larger network system. The interconnection equipment of Changchuan includes gateway and router (the most commonly used). (3) WAN WAN interconnection The interconnection of networks in different regions is mainly realized by Sichuan routers.
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