单项选择题
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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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
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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? （）
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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?（）
A. Follow the emergency action plan.
B. Wait for an issue to be reported.
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D. Determine if escalation is necessary.
