单项选择题
A.Router A must have a Level 2 adjacency with the Level 1/Level 2 router in area 49.0001.
B.The Level 1/Level 2 router in area 49.0001 sets the "attached" bit in the Level 2 LSP it floods into area 49.0001.
C.The Level 1/Level 2 router in area 49.0001 sets the "attached" bit in the Level 1 link-state PDU （LSP） it floods into area 49.0001.
D.The Level 1/Level 2 router in area 49.0001 advertises these prefixed into area 49.0001 using a Level 2 LSP it floods into the area.
多项选择题 WhichtwoarevalidIS-ISPDUtypes？（）
多项选择题 WhatarethreeapplicationsforfirewallfiltersinJUNOSsoftware？（）
单项选择题 Youhaveafirewallfiltercontainingtwotermsappliedinaninbounddirectiononacustomerinterface.Youwouldlikethisfiltertoprotectyournetworkfromaspoofeddenialofserviceattack.Whatmatchcriterionshouldbeusedinthefirsttermofthefilter？（）