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You are here: Home / Design / CCDA / Chapter 4: Enterprise LAN and Data Center Design / Enterprise LAN and Data Center Design – Layer 3 Switching

Enterprise LAN and Data Center Design – Layer 3 Switching

Historically, LAN switching typically involves Layer 2 switching at the Access Layer and sometimes at the Distribution Layer. Layer 2 switches forward information based only on the MAC address (the Layer 2 frame address). Layer 3 switching, however, uses the MAC address in addition to the Layer 3 address (e.g., an IP address).

The following three options exist when considering designing a switched environment:

  1. Layer 2 switching throughout the network
  2. A combination of Layer 2 and Layer 3 switching (this requires a higher degree of planning)
  3. Layer 3 switching throughout the network
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