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・ Hierarchical clustering
・ Hierarchical clustering of networks
・ Hierarchical constraint satisfaction
・ Hierarchical control system
・ Hierarchical Data Format
・ Hierarchical database model
・ Hierarchical decision process
・ Hierarchical Dirichlet process
・ Hierarchical Editing Language for Macromolecules
・ Hierarchical epistemology
・ Hierarchical fair-service curve
・ Hierarchical File System
・ Hierarchical generalized linear model
・ Hierarchical hidden Markov model
・ Hierarchical INTegration
Hierarchical internetworking model
・ Hierarchical matrix
・ Hierarchical model–view–controller
・ Hierarchical modulation
・ Hierarchical Music Specification Language
・ Hierarchical namespace
・ Hierarchical network model
・ Hierarchical organization
・ Hierarchical proportion
・ Hierarchical RBF
・ Hierarchical routing
・ Hierarchical state routing
・ Hierarchical storage management
・ Hierarchical structure of the Big Five
・ Hierarchical task network


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Hierarchical internetworking model : ウィキペディア英語版
Hierarchical internetworking model
The Hierarchical internetworking model, or ''three-layer model'', is a network design model first proposed by Cisco. The
three-layer model divides enterprise networks into three layers: core, distribution, and access layer. Each layer provides different
services to end-stations and servers.
==Access layer==

End-stations and servers connect to the enterprise at the ''access layer''. Access layer devices are usually commodity switching
platforms, and may or may not provide layer 3 switching services. The traditional focus at the access layer is minimizing
"cost-per-port": the amount of investment the enterprise must make for each provisioned Ethernet port. This layer is also called the desktop layer because it focuses on connecting client nodes, such as workstations to the network.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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