多项选择题

Which three TLV types are valid in an IS-IS Hello PDU?（）

A. TLV 10 Authentication
B. TLV 1 Area Addresses
C. TLV 211 Graceful Restart
D. TLV 137 Dynamic Hostname Resolution
E. TLV 14 ABRs

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单项选择题

A. wait
B. hold
C. passive
D. authenticate

单项选择题

A. Level 1 internal routes
B. Level 1 external routes
C. Level 2 internal routes
D. Level 2 external routes

多项选择题

A. MSDP
B. Routing policy
C. Administrative scoping
D. Bootstrap export policy