单项选择题
In IS-IS， how does the restarting router inform its helpers that a restarts event occurred？（）
A.Sending out a graceful restart PDU B.Sending an LSP that contains no TLVs. C.Sending out a restarts TLV with the RR bit set. D.Reflooding its LSP with a maximum sequence number.
单项选择题 YouhaveaLevel1-onlyrouter（RouterA）inIS-ISarea49.0001.HowdoesRouterAlearnhowtogettoIPprefixedinotherareas？（）
多项选择题 WhichtwoarevalidIS-ISPDUtypes？（）
多项选择题 WhatarethreeapplicationsforfirewallfiltersinJUNOSsoftware？（）
