多项选择题 An administrator is unsuccessful in adding VLAN 50 to aswitch. While troubleshooting the problem, the administrator views the output of the show vtp status command, which is displayed in the graphic. What commands must be issued on this switch to add VLAN 50 to the database?（）

多项选择题 Which statements describe the routing protocol OSPF?（）

多项选择题 What information does a router running a link-state protocol use to build and maintain its topological database?（）