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Copyright © 2004, Cisco Systems, Inc. Advanced IP Addressing 1-7 Core Layer—Fully Meshed • The core layer is designed to provide quick and efficient access to headquarters and other divisions within the company. • Redundancy is often found in the core network. • Compared to other layers, the core generally has the circuits with the largest bandwidth. © 2004 Cisco Systems, Inc. All rights reserved. 1 1-7 In the fully meshed core-layer design, each division has redundant routers at the core layer.

You create additional networks (subnets) at the expense of the number of host devices that can occupy each network segment. The number of bits that you add to the default routing mask creates a counting range for subnets. Each count is a unique binary pattern. The number of subnetworks created is calculated by the 2n formula, where n is the number of bits by which the default routing mask is extended. 0 to explicitly allow subnetwork 0. 0 and later, subnetwork 0 is enabled by default. The bits that are not allocated as the network part or the subnetwork part of the address form a counting range for hosts.

Without advanced IP addressing technique, such as summarization and classless interdomain routing (CIDR), the size of the routing table is increased, which causes a variety of problems; for example, the network requires more CPU resources to acknowledge each internetwork topology change in a larger routing table. In addition, larger routing tables have greater potential for delays when the CPU resources sort and search for a match to a destination address. Both of these problems are solved by summarization and CIDR.

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