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During a recent OSPF election among three routers, RTA was elected the DR and RTB was elected the BDR, as seen in the graphic. Assume that RTA fails, and that RTB takes the place ofthe DR whi le RTC becomes the new BDR. What will happen when RTA comes bac

题目

During a recent OSPF election among three routers, RTA was elected the DR and RTB was elected the BDR, as seen in the graphic. Assume that RTA fails, and that RTB takes the place ofthe DR whi le RTC becomes the new BDR. What will happen when RTA comes back online？（）

A. A new election will take place establishing an all new DR and BDR based on configured priority levels and MAC addresses.

B. RTA will take the place of DR immediately upon esta blishing its adjacencies.

C. RTA will take the place of DR only if RTB fails.

D. RTA will take the place of DR only if both RTB and RTC fail.

参考答案和解析
参考答案：D
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相似问题和答案

第1题：

What is the purpose of the OSPF router ID in a OR／BOR election?()

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


参考答案：C

第2题：

Refer to the exhibit. Which statement is true about the configuration? ()

A. RTA will not establish an OSPF adjacency w ith RTB

B. RTA will send OSPF hello packets, but will not send OSPF updates

C. RTA will not accept OSPF hello packets from RTB

D. RTA will send OSPF updates, but will not establish an adjacency with RTB


参考答案：A

第3题：

如图所示，管理员在RTA上配置了如下命令，则描述正确的是()。

A.RTA仍然能够学习到RTB发布的路由信息

B.RTB仍然能够学习到RTB发布的路由信息

C.RTA的邻居信息里不包括RTB

D.RTB的邻居信息里不包括RTA


正确答案：AD

第4题：

RTA是源DR路由器,RTB是RP路由器,组播源向RTA发送组播数据,但RTB上看不到通过PIM register报文想起注册的组播源source,可能得原因有()

A.RTB到RTA没有单播路由

B.RTA路由器学习不到RP信息

C.RTA和RTB没有组播路由

D.RTA学习到的RP不是RTB


参考答案：B, D

第5题：

Refer to the exhibit. Router RTA is the hub router for routers RTB and RTC. The Frame Relay network is configured with EIGRP, and the entire network is in autonomous system 1. However,router RTB a nd RTC are not receiving each other‘s routes. What is the solution?（）

A.Check and change the access lists on router RTA

B.Configure the auto summary command under router eigrp 1 on router RTA

C.Configure subinterfaces on the spoke routers and assig n different IP address subnets for each subinterface

D.Issue the no ip split horizon command on router RTA

E.Issue the no ip split horizon eigrp 1 command on router RTA

F.Configure a distribute list on router RTA that allows it to advertise all r outes to the spoke routers


参考答案：E

第6题：

Refer to the exhibit. OSPF is configured on all routers in the network. On the basis of the show ip ospf n eighbor output, what prevents R1 from establishing a full adjacency with R2? ()

A. Router R1 will only establish full adjacency with the DR and BDR on broadcast multi- access networks.

B. Router R2 has been elected as a DR for the broadcast multiaccess network in OSPF area 1.

C. Routers R1 and R2 are configured as stub routers for OSPF area 1 and OSPF area 2.

D. Router R1 and R2 are configured for a virtual link between OSPF area 1 and OSPF area 2.

E. The Hello parameters on routers R1 and R2 do not m atch.


参考答案：A

第7题：

The Dev － 1 and Dev －3 routers are OSPF neighbors over the Ethernet 0／0 connection. Based on the show ip ospf neighbor output from the Dev － 1 and Dev － 3 routers, which statement is true?()

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


参考答案：E

第8题：

if all OSPF routers on a broadcast network have the same OSPF priority, which parameter is used to determine the new BDR at the time of a DR failure?()

A.A

B.B

C.C

D.D


参考答案：B

第9题：

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


参考答案：D, F

第10题：

在唐德斯(F．C．Donders)的减法反应时实验中，A、B、C三种反应时分别代表简单反应时、选择反应时和辨别反应时，它们的关系为

A.RTB>RTA>RTC.B.RTC>RTB>RTA.C.RTC>RTA>RTB.D.RTB>RTC>RTA

答案：D
解析：
选择反应时指的是根据不同的刺激物，在多种反应方式中选择符合要求的反应（即B反应），并执行该反应所需耍的时间，即RT。。当仅对多个刺激中某个特定的刺激进行反应（即C反应），而其他刺激出现时不予理会，此时测量到的是辨别反应时，即RT。。简单反应时是指给被试呈现单一的刺激，并要求他们只作单一的反应（即A反应），这时刺激一反应之间的时间间隔就是简单反应时，即RT一。A反应是最简单的，RTA是短的，唐德斯把这称之为基线时间。B反应除了基线操作以外还包括了刺激辨认和反应选择两种心理操作。C反应包括了基线操作和刺激辨认两种心理操作。即RTB>RTc>RTA一。

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