new ccna training materials

new ccna training materials.Figure 9.6 WLC forwarding ARP to the gatewayWhen the switch receives an ARP request, it reads its destination MAC address, in this case a broadcast address, and then floods the frame to all ports except the one the frame entered. An exception to this rule occurs if a VLAN is used, in which case the frame will be flooded to all ports that are members of the same VLAN. Assuming the example does not use a VLAN, the frame will be flooded to all ports other than the one the frame entered, as described above.In some cases, the frame will be received through a Layer 3 device, hopefully the default gateway. In Figure 9.7, the router receives the ARP request and responds with its MAC address.That ARP response is sent back as a unicast message, so the switch on that path forwards it directly to the port where the wireless client is returned, rather than flooding the frame to all ports. Eventually the frame is received by the WLC, and the frame must be reconfigured into an802.11 frame. When the WLC rewrites the frame, it uses DA as address 1,SA as address 3,TA as address 2, and address 2 is the SSID of the AP.Figure 9-8 depicts this process.114 Chapter 9 Passing Packets from the Wireless Network to the Wired NetworkDestination Address Source Address0000.0000.0001 000c.0A0A.1111 ARP requestClient A 10.99.99.1 0000.0000.0001Figure 9.7 Gateway Response ARP