In the context of MPLS,what is the correct action to be performed when an aggregate label is received ?()
A. It adds the VPN label into the top label in the MPLS label stack
B. It replaces the top label in the MPLS label stack with a VPN label and propagates
C. It replaces the bottom label in the MPLS label stack with a VPN label and propagates
D. It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packets
E. None of above
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对动作时限要求相互配合的继电器元件,要求在动作快的元件处于尽可能最快而动作慢的元件处于尽可能最慢的实际可能的组合条件下,检验其时限配合关系。
A. 正确
B. 错误
当需要用一次电流及工作电压进行的检验时,必须按当时的负荷情况加以分析,拟订预期的检验结果,凡所得结果与预期的不一致时,应进行认真细致的分析,必要时经许可后通过改动保护回路的接线查找确实原因。
A. 正确
B. 错误