单项选择题 An Intermediate System experiencing memory problems indicates that it may have incomplete data by setting which bit in its LSP?（）

单项选择题 Which IS-IS authentication method is supported on the ERX Edge Router?（）

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 the same area. How many IS-IS adjacencies exist between the two routers?（）