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Implementing Cisco Networking Solutions by Harpreet Singh

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Layer 2 versus layer 3 boundaries

One of the most important design aspects within a campus is to locate the layer 3 boundary. If the layer 3 boundary is too close to the access, the number of prefixes increases rapidly, adding to an increase in the size of the routing tables. If the layer 2 boundary is very far from the access, the broadcast domain gets bigger, thus impacting throughput and performance.

The important decisive factor in determining the layer 3 boundary is taken as the mobility considerations for the users. In conventional networks, if a user belongs to a particular group, he is always assigned to a particular VLAN, so that he always gets the same IP address from the DHCP server when he connects his laptop to the network. Some ...

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