CCNA 2: Chapter 1 Introduction to Switched Networks

Network design principles HIERARCHICAL- Facilitates understanding the role of each device at every tier, simplifies deployment, operation, and management, and reduces fault domains at every tier MODULARITY - Allows seamless network expansion and integrated service enablement on an on-demand basis Resiliency - Satisfies user expectations for keeping the network always on FLEXIBILITY- Allows intelligent traffic load sharing by using all network resources Three-Tiered Hierarchical Design Frameworks Critical Layers Access - Network edge, where traffic enters or exits the campus network. Building intelligence into access layer switches allows applications to operate on the network more efficiently and securely. Distribution - Aggregating large-scale wiring closet networks, Aggregating Layer 2 broadcast domains and Layer 3 routing boundaries, intelligent switching, and routing, high availability through redundant distribution switches, and differentiated services. Core layers - Network backbone.