在ADSL传输中，引起衰减的因素有（）。-找考题网

A.Excessive LSA traffic.
B.Frequent routing table recalculation.
C.Frequent adjacencies table recalculation.
D.Unacceptable number of reachability errors.

多项选择题

OSPF协议定义了5种网络类型，哪些类型的网络需要选举网络Designated Router（DR）、BackupDesignated Router（BDR）（）？

A.Point-to-point
B.Nonbroadcast multi-access
C.Point-to-multipoint
D.Broadcast multi-access

多项选择题

You are the administrator of the large OSPF network and are considering dividing it to multiple areas.What are two advantages of configuring multiple OSPF areas（）？

A.It eliminates the need for a DR or BDR in the OSPF network.
B.It eliminates security concerns by segregating portions of the network.
C.Type 1 and 2 LSAs are confined to a single area，reducing routing overhead.
D.Area members have smaller topological databases than if the network was one large area，requiring less CPU to derive routes。

多项选择题

Which of the following are features are characteristics of an OSPF ABR（）。

A.maintains one link-state database for all areas
B.routes traffic to and from other areas
C.maintains a separate link-state database for each area
D.originates type 3 link-state advertisements which can be summarized
E.has at least one physical interface in area 0