多項選擇題In your Cisco EIGRP network， you notice that the neighbor relationship between two of your routers was recently restarted. Which two of these choices could have made this occur？（）

A.An update packet with init flag set from a known， already established neighbor relationship was received by one of the routers.
B.The ARP cache was cleared.
C.The counters were cleared.
D.The IP EIGRP neighbor relationship was cleared manually.


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3.單項選擇題In BGP routing， what does the rule of synchronization mean？（）

A.A BGP router can only advertise an EBGP learned route， provided that the route is an IGP route in the routing table.
B.A BGP router can only advertise an IBGP learned route， provided that the route is an IGP route in the routing table.
C.A BGP router can only advertise an IBGP learned route， provided that the route is an IGP route that is not in the routing table.
D.A BGP router can only advertise an EBGP learned route， provided that the route is a metric of 0 in the BGP table.