How do routers in an IS-IS Level-1 domain exit to reach other Level-1 （L1） domains？（）A、Level-1（L1） routers use default routes announced by Level-2（L2） routers in Level-1（L1） domainB、Level-1 routers use default routes installed based on ATT bit （Attach Bit） in announcements from Level-1-2（L1/L2） routerC、Level-1 routers use specific routes， for other Level-1 domain， announced by Level-1-2（L1/L2） by route-leaking feature of Cisco IOSD、Level-1 routers use specific routes， for other Level-1 domain， announced by Level-2（L2） by route-leaking feature of Cisco IOS
How do routers in an IS-IS Level-1 domain exit to reach other Level-1 （L1） domains？（）
- A、Level-1（L1） routers use default routes announced by Level-2（L2） routers in Level-1（L1） domain
- B、Level-1 routers use default routes installed based on ATT bit （Attach Bit） in announcements from Level-1-2（L1/L2） router
- C、Level-1 routers use specific routes， for other Level-1 domain， announced by Level-1-2（L1/L2） by route-leaking feature of Cisco IOS
- D、Level-1 routers use specific routes， for other Level-1 domain， announced by Level-2（L2） by route-leaking feature of Cisco IOS
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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、0B、1C、2D、3
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问答题how many neighbor commands required for establish ibgp peers in 4 routers？