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Iuwne10 S01 L09
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Iuwne10 S01 L09

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Transcript

  • 1. Wireless Fundamentals Reviewing the Wireless Frame Journey: End-to-End
  • 2. Discovering the Network
  • 3. Getting Connected
  • 4. Clients in Cells
  • 5. Sending in the Cell
  • 6. Creating the 802.11 Frame
  • 7. Acknowledging the Frame
  • 8. AP Forwarding to Network
  • 9. AP Forwarding to Controller
  • 10. In the Controller, Header Is Rewritten
  • 11. Wired Segment
  • 12. In the Controller, on the Way Back
  • 13. The AP Forwards the Answer
  • 14. Using the Optimal Speed
  • 15. The Right Client Processes the Frame
  • 16. All Frames Are Sent to the Same AP Radio
  • 17. Controller Needs to Keep SSIDs Separated
  • 18. VLANs
    • VLAN = Broadcast Domain = Logical Network (Subnet)
  • 19. VLAN Operation
  • 20. 802.1Q Trunking
  • 21. Understanding Native VLANs
  • 22. Mapping SSIDs to VLANs Each SSID is mapped to a VLAN: 1 SSID => 1 subnet and 1 VLAN tag
  • 23. Configuring VLANs and Trunks
    • Create or modify a VLAN on the switch.
    • Assign switch ports to a VLAN and verify.
    • Save the VLAN configuration.
    • Configure and verify 802.1Q trunks, and save.
  • 24.
      • The maximum number of VLANs is switch-dependent.
      • VLAN 1 is the factory default Ethernet VLAN.
      • Cisco Discovery Protocol is sent on native untagged VLAN.
      • The Cisco Catalyst switch IP address is in the management VLAN (VLAN 1 by default).
    VLAN Creation Guidelines
  • 25. Adding a VLAN
  • 26. Assigning Switch Ports to a VLAN
  • 27. Verifying VLAN Membership
  • 28. Verifying VLAN Membership (Cont.)
  • 29. 802.1Q Trunking
    • Make sure that the native VLAN for an 802.1Q trunk is the same on both ends of the trunk link.
    • Note that native VLAN frames are untagged.
  • 30. Configuring 802.1Q Trunking
  • 31. Verifying a Trunk
  • 32. Summary
      • When wireless frames transit to the wired side of the network, the body is unchanged but the header is transformed to a 802.3 header.
      • VLANs provide on Ethernet segments the segmentation that SSIDs bring to the wireless side.
      • VLANs create tags on frames, and trunks carry these framed tags from switch to switch.
      • VLAN membership can be static or dynamic.
      • Controllers tag frames, and the other end, which is a switch, has to be in trunk mode.
      • A switch has a “native VLAN,” which is usually not tagged on a trunk.
      • Configuring static VLANs consists of creating them and assigning a port to them.
  • 33.  

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