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CCNA 3 Chapter 6
Switches
By
Your Name
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Objectives
• LAN design
• LAN switches
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LAN Design Goals
• Functionality• Scalability • Adaptability
• Manageability
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LAN Design Considerations
• The function and placement of servers • Collision-detection issues • Segmentation issues
• Broadcast domain issues
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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
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Layer 1 Design
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Typical MDF in Star Topologies
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Layer 1 Documentation
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Layer 2 Design
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LAN Topology
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Microsegmentation
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Asymmetric Switching
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Layer 3 Design
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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.
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Physical Network Maps
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VLAN Communication
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LAN Switches
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Access Layer
Shared bandwidthSwitched bandwidthMAC layer bandwidthMicrosegmentation
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Access Layer Switches
• Catalyst 1900 series • Catalyst 2820 series • Catalyst 2950 series • Catalyst 4000 series
• Catalyst 5000 series
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Distribution Layer
• Aggregation of the wiring-closet connections
• Broadcast/multicast domain definition
• VLAN routing
• Any media transitions that need to occur
• Security
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Distribution Layer Switches
•Catalyst 2926G
•Catalyst 5000 family
•Catalyst 6000 family
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Core Layer
The core layer is a high-speed switching backbone. The core layer should be designed to switch packets as fast as possible.
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Core Layer Switches
• Catalyst 6500 series • Catalyst 8500 series • IGX 8400 series • Lightstream 1010
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