Which two IS-IS hello values must match to form a Level 1 IS-IS adjacency？（）

单项选择题Whichcommandatthe[editprotocolsisis]hierarchylevelforcesroutedtraffictoavoidthisrouter？（）

A.metric 64
B.overload
C.priority 0
D.te-metric 32768

多项选择题WhichtwostatementsaboutISreachabilityTLV（TLV2）andtheextendedISreachability（TLV22）aretrue？（）

A.TLV 22 supports wide metrics.
B.TLV 2 is only used in Level 1 routers.
C.TLV 22 displays the neighbor’s extended areas.
D.Only TLV 22 can support the inclusion of sub-TLVs.
E. Only TLV 22 can be flooded across L1/L2 boundaries.

单项选择题InIS-IS，howlongwilltherestarthelperkeeptherestartingrouterintheupstate？（）

A.The hello dead timer expires.
B.The restart duration timer expires.
C.The restarting router sets the down bit.
D.The restart helper sends out three CSNPs.

单项选择题WhatisthemaximummetricvaluethatcanbereportedinanarrowmetricTLV？（）

A.63
B.64
C.1023
D.1024
E.65535

单项选择题AccordingtoJUNOSsoftwarerouteselectionalgorithm，whichIS-ISroutetypeismostpreferred？（）

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