The OSPF External LSA for prefix x.x.x.x exists in the OSPF database， but the prefix is not installed in therouting table. Which are possible explanations？（） ["Inbound distribute-list is configured under the ospf process and it is denying x.x.x.x","ASBR origination the LSA is not reachable","Route to the Forwarding Address in not an internal OSPF route","Route to the Forwarding Address is an internal OSPF route","Route to the ASBR does not follow the same path as the one to the Forwarding Addre"]
下列为低压液化气体的有（）。 ["氨气","氯气","氮气","氧气"]
一堆交换机一个server、一个transpare，问配置prune在哪里配置？
MDU（B类ONU）设备在注册时，不需要配置的模版是（） ["DBA模板","线路模版","业务模版","SNMP模版"]
简述国际环境法的概念与特点。
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