多选题How do routers in an IS-IS Level-1 domain exit to reach other Level-1 （L1） domains？（）ALevel-1（L1） routers use default routes announced by Level-2（L2） routers in Level-1（L1） domainBLevel-1 routers use default routes installed based on ATT bit （Attach Bit） in announcements from Level-1-2（L1/L2） routerCLevel-1 routers use specific routes， for other Level-1 domain， announced by Level-1-2（L1/L2） by route-leaking feature of Cisco IOSDLevel-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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多选题

How do routers in an IS-IS Level-1 domain exit to reach other Level-1 （L1） domains？（）

Level-1（L1） routers use default routes announced by Level-2（L2） routers in Level-1（L1） domain

Level-1 routers use default routes installed based on ATT bit （Attach Bit） in announcements from Level-1-2（L1/L2） router

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

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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