单项选择题 Switch A is configured with VLAN 105 and 106. Switch Bis configured with VLAN 105 and 107.Both switches are connected with a fiber cable. In order for packets from all VLANs to cross thefiber cable, which of the following configurations MUST be present? （）

单项选择题 A natural disaster has occurred and the administrator must return the network to a healthy status.Which of the following should the administrator do in this case?（）

单项选择题 Which of the following network devices would MOST likely be installed on a network to helpreduce broadcast traffic and to allow individual virtual networks?（）