[名词解释] “预期违反合同”

ospf的default metric如何计算？ 班主任对家长进行家庭教育指导的途径是（ ）、（ ）、（）。 文章中（）的句子可以成段。 ["起过渡作用","总结性的","最开始的","最末尾的"] 简述编组站和区段站的区别。 Which two statements are correct about Nonstop Forwarding？（） ["It allows the standby RP to take control of the device after a hardware or software fault on the active RP.","It is a Layer 3 function that works with SSO to minimize the amount of time a network is unavailable tousers following a switchover.","It is supported by the implementation of EIGRP， OSPF， RIPv2， and BGP protocols.","It synchronizes startup configuration， startup variables， and running configuration.","The main objective of NSF is to continue forwarding IP packets following a switchover.","Layer 2 802.1w or 802.1s must be used， as 802.1d cannot process the Layer 2 changes.","Routing protocol tuning parameters must be the same as the NSF parameters， or failover will beinconsistent."] “预期违反合同”