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【多选题】

Which two statements are true about IS -IS routing?（）

A、Based on the default timers, OSPF d etects a failure faster than IS - IS does.

B、OSPF default timers permit more tuning than IS - IS does.

C、IS - IS is more efficient than OSPF in the use of CPU resources.

D、OSPF is more scalable than IS - IS because of its ability to identify normal, stub, an d NSSA areas.

E、IS - IS and OSPF are both Open Standard, link - state routing protocols which support VLSM.

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