CCIE系列認(rèn)證CCIE SP單項(xiàng)選擇題每日一練(2019.01.20)

來源：考試資料網(wǎng)

1 What bit should be set in the link state PDUs in an IS-IS level-1-2 router to indicate that they are a potentialexit point out of the area ？（）

2 What is used as label in cell-based MPLS ？（）

3 Which of the following is used to periodically multicast by DIS on a LAN to ensure IS-IS link state databaseaccuracy？（）

4 The Outer.1Q tag represents customer VLAN ID and inner.1Q tag represents Provider VLAN？（）

5 Which of the following descriptions about IP spoofing is correct？（）