关于OSPF协议中DR（Designated Router）的产

A. It is used with the OSPF priority values to determine which OSPF router will become the DR or BOR in a point-to-point network

B. It is used with the OSPF priority values to determine which interface will be used to form a neighbor relationship with another OSPF router

C. It is used with the OSPF priority values to determine which router will become the DR or BOR in a multi access network

D. It is used to determine which interfaces will send Hello packets to neighboring OSPF routers

A. This is the designated router (DR) on the FastEthernet 0/0 link.

B. The output was generated by the show ip interface c ommand.

C. The router was configured with the commands:r outer ospf 1 network 172.16.6.0 0.0.0.255 area 1

D. The IP address of the backup designated router (BDR) is FE80::205:5FFF:FED3:5808.

E. Interface FastEthernet 0/0 was configured with the ipv6 o spf 1 area 1 command.

F. OSPF version 2 has been enabled to support IPv6.

在广播网络中，OSPF协议要选出一个指定路由器(Designated Router，DR)。DR有几个作用，以下关于DR的描述中，(40)不是DR的作用。

A．减少网络通信量

B．检测网络故障

C．负责为整个网络生成LSA

D．减少链路状态数据库的大小

The internetwork infrastructure of company XYZ consists of a single OSPF area as shown in the graphic. There is concern that a lack of router resources is impeding internetwork performance. As part of examining the router resources, the OSPF DRs need to be known. All the router OSPF priorities are at the default and the router IDs are shown with each router. Which routers are likely to have been elected as DR?（）

A.Corp-1

B.Corp-2

C.Corp-3

D.Corp-4

E.Branch-1

F.Branch-2

A. TK1# show ip ospf interface

B. TK1# show ip ospf priority

C. TK1# show ospf neighbor detail

D. TK1# show ospf processes

E. TK1# show ospf neighbor state

Refer to the exhibit. You have completed an OSPF implementation, and you are verifying OSPF operation. You notice that router A and router B are stuck in the two - way state. From the show ip ospf interface command output, what is the cause of this issue?（）

A. All OSPF implementations must have at le ast one interface in area 0.

B. You are attempting to run in the broadcast mode over an NBMA interface.

C. Both routers are configured to function as a BDR; therefore, there is no DR router.

D. Someone has changed the OSPF router ID; therefore you must clear the OSPF process.

E. The OSPF priority is set to 0 on both routers; therefore neither can become the DR.

A. Dev - 1 is the DR because it has a lower OSPF router ID

B. Dev - 3 is the DR because it has a higher OSPF router priority

C. Both Dev - 1 and Dev - 3 are using the def ault OSPF router priority

D. Dev - 3 is the DR because it has a lower OSPF router ID

E. Dev - 1 is the DR because it has a higher OSPF router priority

Router R1 connects to a Frame Relay cloud using a multipoint subinterface, with ten PVCs associated with the subinterface.What command would make this router not use a DR, and dynamically discover OSPF neighbors?（）

A. ip ospf network broadcast

B. ip ospf network non - broadcast

C. ip ospf network point - to - multipoint

D. ip ospf network point - to - multipoint non - broadcast

A. Point-to-point

B. Point to multipoint

C. Broadcast

D. Non-broadcast multi-access

A network administrator is troubleshooting the OSPF configuration of routers R1 an dR2.The routers cannote stablish an adjacency relation ship on their common Ethernet link.The graphic shows the output of the show ip ospf interface e0 command for routers R1 an dR2.Based on the information in the graphic，what is the cause of this problem？（）

A.The OSPF area is not configured properly.

B.The priority on R1 should be set higher.

C.The cost on R1 should be set higher.

D.The hello and dead timers are not configured properly.

E.A backup designated router needs to be added to the network.

F.The OSPF process ID numbers must match.