单项选择题
An OSPF non-backbone area allows external routes to be flooded within the area. These externalroutes are propagated into other areas. However, external routes from other areas are not allowed to enter this area. Which type of OSPF area does this describe?（）
A. stub area B. transit area C. border area D. not-so-stubby area
单项选择题 In JUNOS software, how is route summarization at the L1/L2 border configured?（）
多项选择题 Which two are default preference values for both internal and external IS-IS Level 2 routes on a Juniper Networks router?（）
多项选择题 What are two purposes of the 224.0.1.40 address in Auto-RP?（）
