"Network Knowledge Point" network basic architecture

Recently all in the system related knowledge, network knowledge has not begun to tidy up, but hurriedly network this classification a little empty, today share the basic knowledge of the network-network infrastructure

The basic structure of the network is the most basic knowledge point, for this basic structure, the term may be different, but the general level of division is not go away, understand this basic architecture is the premise of learning Network.

Global View:

650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M01/8B/7D/wKiom1hPiIWiPtf-AAChGhE0v_U805.png-wh_500x0-wm_3 -wmp_4-s_1518758586.png "title=" Popular Network Architecture "alt=" Wkiom1hpiiwiptf-aachghe0v_u805.png-wh_50 "/>

Where: Wan: Wan, here represents a national area. LAN: Local Area network, here represents a city-level region

Country view:

650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M01/8B/7D/wKiom1hPi5uyjqGcAACkeHjNFFA308.png-wh_500x0-wm_3 -wmp_4-s_4225842295.png "title=" unnamed picture. png "alt=" wkiom1hpi5uyjqgcaackehjnffa308.png-wh_50 "/>

Where: ISP on behalf of network service providers, users through their access network, ISP also has a rating.

Room view ( core view, main view of Operations ):

650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M00/8B/7A/wKioL1hPjDzwT6v1AACkeCPzG_U328.png-wh_500x0-wm_3 -wmp_4-s_3142543987.png "title=" unnamed picture. png "alt=" wkiol1hpjdzwt6v1aackecpzg_u328.png-wh_50 "/>

Interpretation:

Access Layer (two-layer switch):

The access layer usually refers to the part of the network directly facing the user connection or access . The access layer is designed to allow end users to connect to the network , so the access layer switches have low cost and high port density characteristics

In the design of core layer and aggregation layer, the main consideration is that network performance and function are high

Access layer consists of wireless network card, AP and L2switch, according to the definition of broadband network, the main function of Access layer is to complete the user traffic access and isolation. for Wireless LAN WLAN users, the user terminal through the wireless network card and the wireless access point AP Complete user access

aggregation Layer (two-layer switch, three-layer switch or tiered switch):

In general, user access control is scheduled at the access layer, but this is not absolute or can be scheduled at the aggregation layer. in the aggregation layer to achieve security control and identity authentication, the use of centralized management mode. when the network is large, comprehensive security management policies can be designed, such as authentication and MAC address binding at the access layer, and traffic control and access restriction at the aggregation layer.

Provides aggregation \ transport \ management \ Distribution processing of data for the access layer. The aggregation layer provides policy-based connectivity to the access layer , such as address merging, protocol filtering, routing services, authentication management, and so on. Network segmentation (such as VLANs) and networks isolation can prevent some network segment problems from spreading and affecting the core layer. The aggregation layer can also provide interconnection between the access Layer virtual network, Control and restrict access layers to the core layer to ensure the security and stability of the core layer

The aggregation layer switch, compared to the access layer switch, requires higher performance, fewer interfaces, and higher switching rates

Core Layer (three-layer switch, router):

The function of core layer is to realize optimal transmission between backbone network.

The main purpose is to provide optimized, reliable backbone transport structures through high-speed forwarding of communications , so that core-layer switches have higher reliability, performance, and throughput

backbone layer (router, ISP):

High transport quality

PS: This picture is transferred from the Mosaic technology.

This article from "Walk on the road in the operation and maintenance of the dog~" blog, reproduced please contact the author!

"Network Knowledge Point" network basic architecture