200-125 x 200-301

200-125 x 200-301.Figure 2-10 Selecting DPTip: A single switch can have two or more interfaces connected to the same collision domain (collision domain) that will compete to become DP if a hub is used. in these cases, two different switch ports on the same switch will be the same. When DP selection is made. the same two final arbitration rules are used as for RP selection: the lowest interface STP priority and. if still the same. the lowest internal interface value.Suggestions for problem solving for specifying ports in examsOn the exam, you may find DP very easy for RP-related test questions if you know where to look and some of the key command outputs available. Nevertheless, the more conceptual the question, the more you will need to consider the DP selection criteria: first, the root overhead between competing switches, and second, the better BID that would be chosen if the switches had the same root overhead.The list below provides some tips for you to keep in mind when digging deeper into a particular DP topic. Some of the suggestions in the list are the same as those related to finding RPs, but the list still includes every thought for completeness. Warehouse S' (1) If possible, look at the show spanning-tree command in the list of interfaces at the end of the output. Find the Role-column and locate Desg to confirm that the bullet points all existing DPs.44 Chapter 2 Configuring the Spanning Tree Protocol (STP )(2) Determine the root overhead of the switch directly by using the showspanning-tree command. Note, however, that this command displays both locationsof overhead,and is only mentioned at the top, in the section about the root, where the root overhead is listed. (3) For those problems where you must calculate the switch root overhead, perform the following steps.a.Remember the default overhead values: 100 for 10Mbit/s, 19 for 100Mbit/s, 4 for IGbit/s, and 2 for 10Gbit/s.b.Look for signs of the spanning-tree cost configuration command in the interface, as it will override the default overhead. Do not assume that the default overhead is already being used.