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Iuwne10 S01 L09

Iuwne10 S01 L09






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    Iuwne10 S01 L09 Iuwne10 S01 L09 Presentation Transcript

    • Wireless Fundamentals Reviewing the Wireless Frame Journey: End-to-End
    • Discovering the Network
    • Getting Connected
    • Clients in Cells
    • Sending in the Cell
    • Creating the 802.11 Frame
    • Acknowledging the Frame
    • AP Forwarding to Network
    • AP Forwarding to Controller
    • In the Controller, Header Is Rewritten
    • Wired Segment
    • In the Controller, on the Way Back
    • The AP Forwards the Answer
    • Using the Optimal Speed
    • The Right Client Processes the Frame
    • All Frames Are Sent to the Same AP Radio
    • Controller Needs to Keep SSIDs Separated
    • VLANs
      • VLAN = Broadcast Domain = Logical Network (Subnet)
    • VLAN Operation
    • 802.1Q Trunking
    • Understanding Native VLANs
    • Mapping SSIDs to VLANs Each SSID is mapped to a VLAN: 1 SSID => 1 subnet and 1 VLAN tag
    • 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.
        • 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
    • Adding a VLAN
    • Assigning Switch Ports to a VLAN
    • Verifying VLAN Membership
    • Verifying VLAN Membership (Cont.)
    • 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.
    • Configuring 802.1Q Trunking
    • Verifying a Trunk
    • 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.