单项选择题
Routers A and B are connected with a point-to-point OC-3 interface. Each routers OC-3 interface is configured for both Level 1 and Level 2. The routers are configured in different areas. How many IS-IS adjacencies exist between the two routers?（）
A.0 B.1 C.2 D.3
多项选择题 What are two attributes of the Extended IS-Reachability TLV 22?（）
多项选择题 In JUNOS software, which three routing protocols can be used to route IPv6?（）
单项选择题 By default, routes learned via IBGP will be announced to which peers?（）
