R1, an ABR between backbone area 0 and area 1, has intra - area routes in area 0 for 10.1.1.0/24,10.1.2.0/24, and 10.1.3.0/24. These routes have metrics of 21, 22, and 23, respectively. An engineer then adds the area 0 r ange 10.1.0.0 255.255.0.0 command

题目

R1, an ABR between backbone area 0 and area 1, has intra - area routes in area 0 for 10.1.1.0/24,10.1.2.0/24, and 10.1.3.0/24. These routes have metrics of 21, 22, and 23, respectively. An engineer then adds the area 0 r ange 10.1.0.0 255.255.0.0 command under the OSPF process of R1.Which of the following is true?（）

A. R1 loses and then re - establishes neighborships with all neighbors.

B. R1 no longer advertises 10.1.1.0/24 to neighbors into area 1.

C. R1 advertises a 1 0.1.0.0/16 route into area 1 with a metric of 23 (largest metric).

D. R1 advertises a 10.1.0.0/16 route into area 1 with metric of 21 (lowest metric).

相似考题

1.路由器R1的拓扑连接和地址分配如下图所示，如果在R1上安装OSPF协议，运行命令：router ospf 200，则配置E0和E1端口的命令分别是______。A．network 10.1.1.0 255.255.255.0 area 0 network 192.168.1.0 255.255.255.0 area 1B．network 10.1.1.1 255.255.255.0 area 0 network 192.168.1.1 255.255.255.0 area 1C．network 10.1.1.255 0.0.0.8 area 0 network 192.168.1.255 0.0.0.8 area 1D．network 10.1.1.0 0.0.0．255 area 0.0.0.0 network 192.168.1.0 0.0.0.255 area 1

2.路由器R1的拓扑连接和地址分配如图1-9所示，如果在R1上安装OSPF协议，运行下列命令：router ospf 200，则配置E0和E1端口的命令分别是(40)。A．network 10.1.1.0 255.255.255.0 area 0 network 192.168.1.0 255.255.255.0 area 1B．network 10.1.1.1 255.255.255.0 area 0 network 192.168.1.1 255.255.255.0 area 1C．network 10.1.1.255 0.0.0.8 area 0 network 192.168.1.255 0.0.0.8 area 1D．network 10.1.1.0 0.0.0.255 area 0.0.0.0 network 192.168.1.0 0.0.0.255 area 1

3.ABR R1 has been configured with an area 1 stub no － summary command. Which stubby area type is area 1?()A. StubB. Totally stubbyC. NSSAD. Totally NSSA

4.OSPF协议中，ABR的不同端口可能运行在不同的area中，其中一定有接口运行在（)当中.A.area0B.area1C.area10D.area100

参考答案和解析
参考答案：B, D
更多“R1, an ABR between backbone area 0 and area 1, has intra － area routes in area 0 for 10.1. ”相关问题

  • 第1题：

    Refer to the exhibit. Will redistribute d RIP routes from OSPF Area 2 be allowed in Area 1? ()

    A. RIP routes will be allowed in Area 1 only if they are first redistributed into EIGRP.

    B. Because NSSA will discard type 7 LSAs, redistributed RIP routes will not be allowed in Area 1.

    C. Redistrib uted RIP routes will be allowed in Area 1 because they will be changed into type 5 LSAs in Area 0 and passed on into Area 1.

    D. Redistributed RIP routes will be allowed in Area 1 because they will be changed into type 7 LSAs in Area 0 and passed on into Area 1.

    E. Because Area 1 is an NSSA, redistributed RIP routes will not be allowed.


    参考答案：E

  • 第2题：

    When an OSPF design is planned, which implementation can help a router not have memory resource issues?()

    A. Have a backbone area (area 0) with 40 routers and use default routes to reach external destinations

    B. Have a backbo ne area (area 0) with 4 routers and 30,000 external routes injected into OSPF

    C. Have less OSPF areas to reduce the need for interarea route summarizations

    D. Have multiple OSPF processes on each OSPF router. Example, router ospf 1, router ospf 2


    参考答案：A

  • 第3题：

    Refer to the exhibit. During the process of configuring a virtual link to connect area 2 with the backbone area, the network administrator received this console message on R3:*Mar 1 00:2 5:01.084: %OSPF -4- ERRRCV: Received invalid packet: mismatch area ID, from backbone area must be virtual link but not found from 20.20.20.1, Serial 0 .How should the virtual link be configured on the OSPF routers to establish full connectivity between the areas?（）

    A.R1(config - router)# area 0 virtual - link 1.1.1.1R3(config - router)# area 2 virtual - link 3.3.3.3

    B.R1(config - router)# area 1 virtual - link 2.2.2.2 R3(config - router)# area 1 virtual - link 2.2.2.2

    C.R1(config - router)# area 1 virtual - link 20.20 .20.2 R3(config - router)# area 1 virtual - link 30.30.30.2

    D.R1(config - router)# area 1 virtual - link 30.30.30.3 R3(config - router)# area 1 virtual - link 20.20.20.1

    E.R1(config - router)# area 1 virtual - link 3.3.3.3 R3(config - router)# area 1 virtual - link 1.1 .1.1


    参考答案：E

  • 第4题：

    When an OSPF design is planned, which implementation can help a router not have memory resource issues?（）

    • A、Have a backbone area (area 0) with 40 routers and use default routes to reach external destinations
    • B、Have a backbo ne area (area 0) with 4 routers and 30,000 external routes injected into OSPF
    • C、Have less OSPF areas to reduce the need for interarea route summarizations
    • D、Have multiple OSPF processes on each OSPF router. Example, router ospf 1, router ospf 2

    正确答案:A

  • 第5题：

    OSPF routing uses the concept of areas. What are the characteristics of OSPF areas?（）

    • A、Each OSPF area requires a loopback interface to be configured. 
    • B、Areas may be assigned any number from 0 to 65535.
    • C、Area 0 is called the backbone area.
    • D、Hierarchical OSPF networks do not require multiple areas.
    • E、Multiple OSPF areas must connect to area 0.
    • F、Single area OSPF networks must be configured in area 1.

    正确答案:B,C,E

  • 第6题：

    Why would you make a non-backbone area a stub or not-so-stubby area？（）

    • A、 to aggregate routes learned from the ABR
    • B、 to lower the cost of routes advertised by the ABR
    • C、 to connect a non-contiguous area to the backbone
    • D、 to decrease the size of the link-state database in that area

    正确答案:D

  • 第7题：

    Area Border Router （ABR） is a router located on the border of one or more OSPF areas that connect those areas to the backbone network. An ABR will inject a default route into which two types of areas？（）

    • A、Area 0
    • B、NSSA
    • C、Totally stubby
    • D、Stub

    正确答案:C,D

  • 第8题：

    Which of the following is true about an OSPF area border router (ABR)?（）

    • A、The ABR must have multiple interfaces connected to the backbone areA
    • B、An ABR is a router with two interfaces, each connected to a different nonbackbone areA
    • C、The only requirement to be considered an  ABR is at least one interface connected to the backbone areA
    • D、An ABR must have at least one interface in the backbone area plus at least one other interface in a nonbackbone areA

    正确答案:D

  • 第9题：

    OSPF协议中，ABR的不同端口可能运行在不同的area中，其中一定有接口运行在（）当中。

    • A、area0
    • B、area1
    • C、area10
    • D、area100

    正确答案:A

  • 第10题：

    单选题
    ABR R1 has been configured with an area 1 stub no - summary command. Which stubby area type is area 1?（）
    A

    Stub

    B

    Totally stubby

    C

    NSSA

    D

    Totally NSSA


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    An OSPF non-backbone area allows external routes to be flooded within the area. These external routes are propagated into other areas. However， external routes from other areas are not allowed to enter this area. Which type of SPF area does this describe？（）
    A

    stub area

    B

    transit area

    C

    border area

    D

    not-so-stubby area


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    Which of the following is true about an OSPF area border router (ABR)?（）
    A

    The ABR must have multiple interfaces connected to the backbone areA

    B

    An ABR is a router with two interfaces, each connected to a different nonbackbone areA

    C

    The only requirement to be considered an  ABR is at least one interface connected to the backbone areA

    D

    An ABR must have at least one interface in the backbone area plus at least one other interface in a nonbackbone areA


    正确答案： A
    解析： 暂无解析

  • 第13题：

    Refer to the exhibit. What is the effect of the OSPF configuration on router B?()

    A. All interfaces will be in area 0

    B. The router will be an ABR with s1/0 in area 0 and f0/0 and 0/1 in area 1

    C. The route r will be an ABR with s1/0 in area 0 and f0/0 and 0/1 in area 2

    D. The router will be an ABR with s1/0 in area 0, f0/0 in area 1, and f0/1 in area 2


    参考答案：D

  • 第14题：

    Which of the following are characteristics of OSPF areas?()

    A. Hierarchical OSPF networks need to be in one area

    B. Multiple OSPF areas must connect to area 0

    C. Single area OSPF networks must be configured in area 1

    D. Areas can be assigned any number from 0 to 63535

    E. Area 0 is called the backbone area

    F. Each OSPF area need to be configured with a loopback interface


    参考答案：B, E

  • 第15题：

    路由器R1的拓扑连接和地址分配如图5-3所示，如果在R1上安装OSPF协议，运行命令router ospf 200，则配置E0和E1端口的命令分别是(26)。

    A．network 10.1.1.0255.255.255.0 area0 network 192.168.1.0 255.255.255.0 area 1

    B．network 10.1.1.1 255.255.255.0 area0 network 192.168.1.1 255.255.255.0 area 1

    C．network 10.1.1.255 0.0.0.8 area 0 network 192.168.1.255 0.0.0.8 area 1

    D．network 10.1.1.0 0.0.0.255 area 0.0.0.0 network 192.168.1.0 0.0.0.255 area 1


    正确答案：D
    解析：在如图5-3所示的网络拓扑结构中，在路由器R1上安装OSPF协议，运行router ospf200启用ID号为200的路由器进程，且进入路由协议的配置子模式。
      当配置OSPF协议时，指定与某一路由器相连的网络的配置命令是“network address wildcard-mask are area area-id”。其中，“address”字段是指与路由器相连的网段IP地址(注意不是该网段中某个具体的IP地址)；“wildcard-mask”用于指明该网段IP地址的子网掩码的反码；网络区域ID(area-id)一般取数字0～4 294 967 295，也可以用类似于IP地址X.X.X.X的表达格式。当网络区域ID为0或0.0.0.0时，说明该网络区域为主干域。不同网络区域的路由器是通过主干域来获取路由信息的。
      由于路由器R1的e0端口的IP地址为10.1.1.1/24，该IP地址的网络地址为10.1.1.0，“/24”是子网掩码为255.255.255.0的缩写形式，而该子网掩码的反码是0.0.0.255。因此，指定与路由器R1的e0端口相连的网络的配置命令是network 10.1.1.00.0.0.255 area0.0.0.0。其中“0.0.0.0”表示该网段为主干域。
      同理，路由器R1的e1端口的IP地址为192.168.1.1/24，该IP地址的网络地址为192.168.1.0，子网掩码为255.255.255.0，该子网掩码的反码是0.0.0.255。因此，指定与路由器R1的e1端口相连的网络的配置命令足network 192.168.1.0 0.0.0.255 area 1。其中，10.1.1.0是e0所在端口的IP地址，0.0.0.255是 255.255.255.0的反向掩码。

  • 第16题：

    R1, an ABR between backbone area 0 and area 1, has intra - area routes in area 0 for 10.1.1.0/24,10.1.2.0/24, and 10.1.3.0/24. These routes have metrics of 21, 22, and 23, respectively. An engineer then adds the area 0 r ange 10.1.0.0 255.255.0.0 command under the OSPF process of R1. Which of the following is true?（）

    • A、R1 loses and then re - establishes neighborships with all neighbors.
    • B、R1 no longer advertises 10.1.1.0/24 to neighbors into area 1.
    • C、R1 advertises a 1 0.1.0.0/16 route into area 1 with a metric of 23 (largest metric).
    • D、R1 advertises a 10.1.0.0/16 route into area 1 with metric of 21 (lowest metric).

    正确答案:B,D

  • 第17题：

    R1 is internal to area 1, and R2 is internal to area 2. Subnet 10.1.1.0/24 exists in area 2 as a connected subnet off R2. ABR ABR1 connects area 1 to backbone area 0, and ABR2 c onnects area 0 to area 2. Which of the following LSAs must R1 use when calculating R1's best route for 10.1.1.0/24?（）

    • A、R2's Type 1 LSA
    • B、Subnet 10.1.1.0/24's Type 2 LSA
    • C、ABR1's Type 1 LSA in area 0
    • D、Subnet 10.1.1.0/24's Type 3 LSA in Area 0
    • E、  Subnet 10.1.1.0/24's Type 3 LSA in Area 1

    正确答案:E

  • 第18题：

    Which of the following are characteristics of OSPF areas?（）

    • A、Hierarchical OSPF networks need to be in one area
    • B、Multiple OSPF areas must connect to area 0
    • C、Single area OSPF networks must be configured in area 1
    • D、Areas can be assigned any number from 0 to 63535
    • E、Area 0 is called the backbone area
    • F、Each OSPF area need to be configured with a loopback interface

    正确答案:B,E

  • 第19题：

    The following command output was gathered from Router R1, an ABR between areas 0 (backbone) and area 1. In this internetwork, area 0 contains all the subnets of cla ss A network 10.0.0.0. R1's OSPF process has a distribute - list prefix question in command configured. Assuming the subnets listed in the answers actually exist in area 0. Which of the following occurs on router R1?（） R1#sh ip prefix - list ip prefix - list question: 4 entries seq 5 deny 10.1.2.0/24 ge 25 le 27 seq 15 deny 10.2.0.0/16 ge 30 le 30 seq 20 permit 0.0.0.0/0 le 32

    • A、R1 will not create/flood a type 3 LSA for subnet 10.1.2.0/26 into area 1
    • B、R1 will not create/flood a Type 3 LSA for subnet 1 0.1.2.0/24 into area 1
    • C、R1 will not have an OSPF route for subnet 10.1.2.0/26 in its IP routing tablE
    • D、R1 will not have an OSPF route for subnet 10.1.2.0/24 in its IP routing tablE

    正确答案:C

  • 第20题：

    An OSPF non-backbone area allows external routes to be flooded within the area. These externalroutes are propagated into other areas. However, external routes from other areas are not allowed to enter this area. Which type of OSPF area does this describe?（）

    • A、stub area
    • B、transit area
    • C、border area
    • D、not-so-stubby area

    正确答案:D

  • 第21题：

    单选题
    An OSPF non-backbone area allows external routes to be flooded within the area. These externalroutes are propagated into other areas. However, external routes from other areas are not allowed to enter this area. Which type of OSPF area does this describe?（）
    A

    stub area

    B

    transit area

    C

    border area

    D

    not-so-stubby area


    正确答案： A
    解析： 暂无解析

  • 第22题：

    多选题
    R1, an ABR between backbone area 0 and area 1, has intra - area routes in area 0 for 10.1.1.0/24,10.1.2.0/24, and 10.1.3.0/24. These routes have metrics of 21, 22, and 23, respectively. An engineer then adds the area 0 r ange 10.1.0.0 255.255.0.0 command under the OSPF process of R1. Which of the following is true?（）
    A

    R1 loses and then re - establishes neighborships with all neighbors.

    B

    R1 no longer advertises 10.1.1.0/24 to neighbors into area 1.

    C

    R1 advertises a 1 0.1.0.0/16 route into area 1 with a metric of 23 (largest metric).

    D

    R1 advertises a 10.1.0.0/16 route into area 1 with metric of 21 (lowest metric).


    正确答案： D,A
    解析： 暂无解析

  • 第23题：

    单选题
    R1 is internal to area 1, and R2 is internal to area 2. Subnet 10.1.1.0/24 exists in area 2 as a connected subnet off R2. ABR ABR1 connects area 1 to backbone area 0, and ABR2 c onnects area 0 to area 2. Which of the following LSAs must R1 use when calculating R1's best route for 10.1.1.0/24?（）
    A

    R2's Type 1 LSA

    B

    Subnet 10.1.1.0/24's Type 2 LSA

    C

    ABR1's Type 1 LSA in area 0

    D

    Subnet 10.1.1.0/24's Type 3 LSA in Area 0

    E

      Subnet 10.1.1.0/24's Type 3 LSA in Area 1


    正确答案： E
    解析： 暂无解析

  • 第24题：

    单选题
    The following command output was gathered from Router R1, an ABR between areas 0 (backbone) and area 1. In this internetwork, area 0 contains all the subnets of cla ss A network 10.0.0.0. R1's OSPF process has a distribute - list prefix question in command configured. Assuming the subnets listed in the answers actually exist in area 0. Which of the following occurs on router R1?（） R1#sh ip prefix - list ip prefix - list question: 4 entries seq 5 deny 10.1.2.0/24 ge 25 le 27 seq 15 deny 10.2.0.0/16 ge 30 le 30 seq 20 permit 0.0.0.0/0 le 32
    A

    R1 will not create/flood a type 3 LSA for subnet 10.1.2.0/26 into area 1

    B

    R1 will not create/flood a Type 3 LSA for subnet 1 0.1.2.0/24 into area 1

    C

    R1 will not have an OSPF route for subnet 10.1.2.0/26 in its IP routing tablE

    D

    R1 will not have an OSPF route for subnet 10.1.2.0/24 in its IP routing tablE


    正确答案： B
    解析： 暂无解析

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