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CCNP : Notes... 2. The typical three-layer hierarchical internetworking model consists of the following: Core layer: Core layer is responsible to provide an optimal and reliable transport structure. The core layer is the backbone network of the entire internetwork and may include LAN and WAN backbones. Core layer usually consists of fully redundant paths with technologies such as FDDI, Fast Ethernet, and/ or ATM. Distribution layer: Distribution layer is responsible to provide access to the internetwork as well as to the servers. Distribution layer sits between the Core layer and the Access layer. The policies such as ACLs are implemented at the distribution layer. Distribution layer is also known as workgroup layer. Access layer, provides the users, access to the resources on internetwork. In real world, a single device may be functioning at both Access layer as well as distribution layer. This is true for even Core layer. 3. Network segmentation:           Network congestion can be addressed by segmentation of the network. Network segmentation, also called micro segmentation, can be done by using: Bridges, Routers, and Switches.