Transcript CCNA 3 Module 3 Single

CCNA 3 v3.0 Module 5
Switches
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1
Objectives
• LAN design
• LAN switches
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2
LAN Design Goals
• Functionality
• Scalability
• Adaptability
• Manageability
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3
LAN Design Considerations
• The function and placement of servers
• Collision-detection issues
• Segmentation issues
• Broadcast domain issues
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4
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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5
Layer 1 Design
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6
Typical MDF in Star Topology
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Extended Star Topology in a Multi-Building
Campus
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8
Layer 1 Documentation Logical Diagram
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Cut Sheet
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Layer 2 Design: Developing a LAN
Topology
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11
Microsegmentation of the Network
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12
Asymmetric Switching
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Layer 2 Switch Collision Domains
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Layer 3 Design
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Use Routers to Impose 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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16
Physical Network Maps
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17
Setting Up VLAN Implementation
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18
VLAN Communication
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Access Layer
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Access Layer
• Functions of the Access Layer:
Shared Bandwidth
Switched Bandwidth
MAC Layer Bandwidth
Microsegmentation
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21
Access Layer Switches
• Catalyst 1900 series
• Catalyst 2820 series
• Catalyst 2950 series
• Catalyst 4000 series
• Catalyst 5000 series
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Distribution Layer
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Distribution Layer
• In a switched network, the distribution layer
includes several functions such as the following:
Aggregation of the wiring-closet connections
Broadcast/multicast domain definition
VLAN routing
Any media transitions that need to occur
•
Copper to fiber
Security
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Distribution Layer Switches
Cisco Catalyst 2926G
<not pictured>
Cisco Catalyst 6000 Family
Cisco Catalyst 5000 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
<not pictured>
Catalyst 6500 series
IGX 8400 series
Lightstream 1010
Catalyst 8500 series
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