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多项选择题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

  • B,C
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