Capa acceso dis

www.ciscopress.comCopyright 2003

CCNA 3 Chapter 6

Switches

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Objectives

• LAN design

• LAN switches


LAN Design Goals

• Functionality• Scalability • Adaptability

• Manageability


LAN Design Considerations

• The function and placement of servers • Collision-detection issues • Segmentation issues

• Broadcast domain issues


LAN Design Methodology

• Gather requirements and expectations • Analyze requirements and data • Design the Layer 1, 2, and 3 LAN structure,

or topology

• Document the logical and physical network implementation


Layer 1 Design


Typical MDF in Star Topologies


Layer 1 Documentation


Layer 2 Design


LAN Topology


Microsegmentation


Asymmetric Switching


Layer 3 Design


Logical Structure

Routers provide scalability because they serve as firewalls for broadcasts. They can also provide scalability by dividing networks into subnetworks, or subnets, based on Layer 3 addresses.


Physical Network Maps


VLAN Communication


LAN Switches


Access Layer

Shared bandwidthSwitched bandwidthMAC layer bandwidthMicrosegmentation


Access Layer Switches

• Catalyst 1900 series • Catalyst 2820 series • Catalyst 2950 series • Catalyst 4000 series

• Catalyst 5000 series


Distribution Layer

• Aggregation of the wiring-closet connections

• Broadcast/multicast domain definition

• VLAN routing

• Any media transitions that need to occur

• Security


Distribution Layer Switches

•Catalyst 2926G

•Catalyst 5000 family

•Catalyst 6000 family


Core Layer

The core layer is a high-speed switching backbone. The core layer should be designed to switch packets as fast as possible.


Core Layer Switches

• Catalyst 6500 series • Catalyst 8500 series • IGX 8400 series • Lightstream 1010

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