简答题 Which OSPF feature allows a router to continue to forward packets while undergoing specific， well-known failure conditions？

WhyareRegistermessagesneededinPIMSM？

问答题Why are Register messages needed in PIM SM？

switchortport-securityviolation选择shutdown表示什么意思？

问答题switchort port-security violation选择shutdown表示什么意思？

Whatisthepurposeofanadministrativedistance？

问答题What is the purpose of an administrative distance？