多选题Which two statements about the IS -IS routing protocol are true?（）AIS - IS is capable of supporting IPv4 and IPv6.BIS - IS is only capable of supporting IPv4 and CLNS.CIS - IS routers use ES - IS hellos (ESH) to establish and to maintain neighbor relationships.DIS - IS routers run the Bellman - Ford algorithm against their LSDBs to pick the best paths.ELevel 1 routers learn about paths within the area of which they are a part.FLevel 2 routers learn about paths both within areas and between areas.
多选题
Which two statements about the IS -IS routing protocol are true?（）
A
IS - IS is capable of supporting IPv4 and IPv6.
B
IS - IS is only capable of supporting IPv4 and CLNS.
C
IS - IS routers use ES - IS hellos (ESH) to establish and to maintain neighbor relationships.
D
IS - IS routers run the Bellman - Ford algorithm against their LSDBs to pick the best paths.
E
Level 1 routers learn about paths within the area of which they are a part.
F
Level 2 routers learn about paths both within areas and between areas.
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