单项选择题
A. Between networks
B. Within routers
C. Within networks
D. Between WAPs
单项选择题 At which of the following layers does the UDP protocol operate?（）
单项选择题 Which of the following connector types is commonly identified by two rows of pins with four in onerow and five in the other?（）
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? （）