200 301 ccna exam

200 301 ccna exam.The switch is not used once for STP and then never again. The switch is continuously observed for changes. These changes can be caused by a link or switch failure or by the use of a new link. The configuration can change the STP topology in some way. This section briefly discusses the various types of ways to change the STP topology, either through configuration or through state modification of LAN devices and links. Affecting the STP Topology by Modifying the ConfigurationA network administrator can change the choices made by the STP in a given LAN by modifying the STP settings. There are two main tools that administrators can use to configure the bridge ID (BID) and change the STP port overhead.Switches can create a default BID by selecting a default priority value and adding a switch hardware-built, generic MAC address. but administrators always want to choose a particular switch to be the root. Chapter 2 shows you how to configure a Cisco switch to replace its default BID parameter and make the switch the root.Port overheads also have their default values, per port and per VLAN. You can configure these port overheads or use the default values. Table 1-6 lists the default port overheads as defined by IEEE, and Cisco uses the same defaults. ". ..... Table 1-6 follows IEEE's default port overheadkgsEthernet Speed IEEE Overhead10 Mbit/s 100100 Mbit/s 191 Gbit/s 410 Gbit/s 2