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CCNA 3 v3.1 Module 8
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CCNA 3 Module 8
Virtual LANS (VLANS)
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Objectives of Module 8
• VLAN concepts
• VLAN configuration
• Troubleshooting VLANs
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Introduction to VLANs
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VLANs
VLANs logically segment switched networks based on an organization's functions, project teams, or applications as opposed to a physical or geographical basis.
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Broadcast Domains
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3 Broadcast Domains, 3 VLANs
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Static VLANs
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Dynamic VLANs
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Port-Centric VLANs
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VLAN Configuration
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Benefits of VLANs
• Easily move workstations on the LAN
• Easily add workstations to the LAN
• Easily change the LAN configuration
• Easily control network traffic
• Improve security
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Communicating Between VLANs
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VLAN Types
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Inter-Switch Link
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Concurrent Transmissions in a Switch
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End-to-End VLANs
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Static VLANs
• Static VLANs work well in networks where the following is true:
Moves are controlled and managed.
There is robust VLAN management software to configure the ports.
It is not desirable to assume the additional overhead required when maintaining end-station MAC addresses and custom filtering tables.
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Verifying VLAN’s
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Saving VLAN Configuration
Back up using the copy running-config tftp command, or you can use the HyperTerminal Capture Text feature to store the configuration settings.
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Deleting VLANs
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VLAN Problem Isolation
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Problem Isolation in Catalyst Networks
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Preventing Broadcast Storms
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Common Problems in Troubleshooting VLANs
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show vlan Command
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Catalyst IOS Keyword Syntax Description
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show spanning-tree Command
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VLAN Troubleshooting Scenarios
A trunk link cannot be established between a switch and a router
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VLAN Troubleshooting Scenarios
VTP is not properly propagating VLAN configuration changes.
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VLAN Troubleshooting Scenarios
Dropped packets and loops