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Implementing Cisco Networking Solutions by Harpreet Singh

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Layer 3 technologies

As discussed in the previous chapters, Internet Protocol (IP) is a layer 3 protocol. Recall that a primary function of layer 3 is routing of packets across different subnets. Every interface that is connected to the network needs to have an IP address for identification. Since IP addressing design is critical to any network, we will start with a quick recap of IP addressing and then delve into the considerations for IP address planning for networks.

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