200 301 ccna study guide

200 301 ccna study guide.The length of time in each intermediate state is consistent with the forwarding delay timer (default 15 seconds). Therefore, it takes 30 seconds for an interface to transition from the blocking state to the forwarding state triggered by a single convergence event. In addition, the switch needs to wait the number of seconds for MaxAge before deciding to transition the interface from the blocking state to the forwarding state.For example, looking closely at the initial STP topology in Figure 1-5 through Figure 1-8, Figure 1-9 shows the condition of a failed link from SW1 to SW3. If SW1 simply stops sending Hello messages to SW3, but the link between these two switches does not fail, SW3 will need to wait for the MaxAge time (default time of 20 seconds) before it can respond.SW3 can actually quickly select the STP role for its port, but while interface GiO/2 is in the listening and learning states, SW3 will also need to wait 15 seconds for each, resulting in a total convergence delay of 50 seconds.For reading purposes, Table 1-8 summarizes the various interface states of Spanning Tree. -Table 1-8 IEEE802.1D Spanning Tree StatusStatus Whether data frames are forwarded Whether MAC is learned from the received frames Short or stable stateBlocking No No StableListening No No ShortLearning No Yes TransientForwarding Yes Yes StableDisable No No Stable1.2.3 STP Optional Features