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單項(xiàng)選擇題

At which of the following layers does the UDP protocol operate?（）

A.Layer 1
B.Layer 4
C.Layer 6
D.Layer 7

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單項(xiàng)選擇題

Which of the following connector types is commonly identified by two rows of pins with four in onerow and five in the other?（）

A.DB-9
B.RJ-45
C.SC
D.BNC

單項(xiàng)選擇題

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? （）

A. Reverse ARP
B. Full duplex on the fiber link
C. PoE
D. 802.1q trunking