200-301 cisco book

200-301 cisco book.It is recommended that you use the show vlan and show vlanbrief commands first when possible, as these commands list all known VLANs and the access interfaces assigned to each VLAN. Note in particular that multiple, but not all, interfaces are displayed in the output of these commands, and the commands list the following.. The interface is not running trunk.The current status of all interfaces that are in the no-connection state or disabled (err-disabled) due to an error. For example, when G0/2 is non-trunked, the command output displays in the VLAN 1 interface list may include interface Gi0/2 but once GiO/2is enabled, port aggregation (Trunking) is immediately negotiated. At that point, the interface is no longer an access interface and will not be in the show vlan brief command output.If the show vlan and show interfaceswitchport cannot be utilized in some special test questions, the show mac address-table command can also help determine the access VLAN. this command lists the MAC address table, and each entry in the table includes the MAC address, interface, and VLAN ID0 If the test means that the switch interface is connected to a separate PC, then only the2.2 Basic Contents 65see a MAC address table entry listing a specific access interface, and the same entry includes the VLANID, which allows you to determine the access VLAN.(You cannot apply this method to port aggregation (Trunking) interfaces.)After the access interface and its associated VLAN are determined, if the interface is assigned to the wrong VLAN, use the switchport access vlan vlan-id interface subcommand to assign the correct VLAN ID to itO(2) Access VLAN undefined or inactive If the switch does not forward frames in VLANx in the following cases.The switch does not define VLAN x (for example, with the vlan x command).