单项选择题
What is the default function of a secondary path in MPLS?（）
A. to act as an equal-cost path to the primary path B. to enable another LSP for load balancing C. to act as a diverse backup path to the primary path D. to allow the use of explicit path selection via EROs
单项选择题 （）是关于竞争环境、竞争对手和竞争策略的信息和研究，包括对竞争信息的收集和分析以及由此形成的情报和战略。
单项选择题 A Windows OS has failed to load after a successful power on self test. Which of the following steps will help troubleshoot the problem?（）
多项选择题 What information do OSPF hello packets contain?（）
