单项选择题
Within IS-IS, the restart helper performs which task?（）
A. It sends CSNPs to the restarting router.
B. It periodically sends TLV 211 to the restarting router.
C. It informs other routers in the domain that a router has restarted.
D. It tears down adjacency and sends its entire database after 30 seconds.
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What is the function of the Type 4 LSA?（）
A. Advertise cost to the ABR.
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TLVs can be carried in what type of IS-IS PDU?（）
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