问题:
A . Interfaces have a default metric of 1.
B . Level 1 is intra - area and level 2 is interarea.
C . Level 1 routing is between an end system (ES) and IS while Level 2 routing is between an IS and IS.
D . Hosts send ISHs while routers send ESHs.
E . IS - IS is an open standard.
F . Metrics depend on interface speed.
● 参考解析
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