200 301 practice questions

200 301 practice questions.To show the effect of changing the port overhead, the next example is a change to the SW3 configuration that sets its G0/1 port overhead higher so that the better path to the root will be output through SW3's G0/2 port. Also shown in Example 2-3Example 2-3 manipulates the STP port overhead and observes several other interesting effects of the forwarding state transition. Total Overhead = 4Example 2-3 (continued).Mar 11 06:28:00.860: STP [10]: Generating TC trap for port GigabitEthernetO/1 *Mar 11 06:28:00.860: STP: VLAN0010 Gi0/l -> blocking*Mar11 06:28:15.867: STP: VLAN0010 GiO/2 ->learning *Mar 11 06:28:30.874: STP[10]: Generating TC trap for port GigabitEthernetO/2 *Mar 11 06:28:30.874: STP: VLAN0010 sent Topology Change Notice on GiO/2 *Mar 11 06:28:30.874: STP: VIAN0010 GiO/2 -> forwardingThis example begins by executing the debug sparming-tree events command on SWl. This command tells the switch to issue a debug log message whenever the STP modifies the interface role or state. These messages are displayed in the example as configuration results. Next, the example will show the configuration made to change the SW3 port overhead to 30 in VLAN 10, using the spanning-tree1.2 Base Content 32vlan 10 cost30 interface subcommand. As you can see from the figure, the root overhead for port G0/1 via SW3 is now 30 instead of 4. Therefore, the optimal overhead for SW3 to reach the root is 8,using SW3's G0/2 as its root port.The debug message tells us how the STP on SW3 is thinking and has a timestamp attached to each step. Note that in this example, the first five debug messages that are displayed after the user exits configuration mode all occur at the same time (the difference is no more than milliseconds). It is worth noting that port G0/1, which has been performing forwarding, will immediately become blocked. Interface G0/2, which is already blocked, does not change to the forwarding state, but goes into the listening state (at least for this message).