多项选择题
Which two conditions, when met, allow an IS-IS Level 2 router to be considered attached?（）
A. You can reach other Level 2 routers. B. It can reach at least one other defined area. C. The router is reachable by at least two ES-IS nodes. D. It has at least one enabled reachable prefix with a valid metric defined.
多项选择题 Which two are characteristics of both Kompella and Martini-based VPNs? （）
单项选择题 Which extension to the OSPFv2 protocol supports traffic engineering?（）
单项选择题 By default, to which peers will a BGP router advertise routes learned from IBGP peers?（）
