问答题
An administrative distance is a̳......
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InmulticastnetworkhowtoselectDR？andwhatistheorder？
问答题In multicast network how to select DR？ and what is the order？
WhatfieldinIPpacketispreventthepacketfromaroutetorouter...
问答题What field in IP packet is prevent the packet from a route to router forever？
whatisanycastaddress（Ipv6）？
问答题what is anycast address （Ipv6）？
