多项选择题
Which two statements about IS reachability TLV （TLV 2） and the extended IS reachability （TLV 22） are true？（）
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？（）
单项选择题 WhatisthemaximummetricvaluethatcanbereportedinanarrowmetricTLV？（）
单项选择题 AccordingtoJUNOSsoftwarerouteselectionalgorithm，whichIS-ISroutetypeismostpreferred？（）
