单项选择题
Which mechanism accommodates the use of overlapping addresses in 2547bis VPNs?（）
A. policies B. route origins C. route targets D. route distinguishers
多项选择题 In which two ways can the router ID selection be controlled?（）
单项选择题 Why does IS-IS use the SPF algorithm?（）
单项选择题 Which BGP attribute is considered first as a tie-breaker in JUNOS software?（）
