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).
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第1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
参考答案：B
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第2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?（）R1sh ip prefix - listip prefix - list question: 4 entriesseq 5 deny 10.1.2.0/24 ge 25 le 27seq 15 deny 10.2.0.0/16 ge 30 le 30seq 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
参考答案：C
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第3题：
R1 has 5 working interfaces, with EIGRP neighbors existing off each interface. R1 has routes for subnets 10.1.1.0/24, 10.1.2.0/24, and 10.1.3.0/24, with EIGRP integer metrics of roughly 1 million, 2 million, a nd 3 million, respectively. An engineer then adds the ip summary - address eigrp 1 10.1.0.0 255.255.0.0 command to interface Fa0/0.Which of the following is true?（）
A. R1 loses and then reestablishes neighborships with all neighbors.
B. R1 no longer advert ises 10.1.1.0/24 to neighbors connected to Fa0/0.
C. 1 advertises a 10.1.0.0/16 route out Fa0/0, with metric of around 3 million (largest metric of component subnets).
D. R1 advertises a 10.1.0.0/16 route out Fa0/0,with metric of around 2 million (med ian metric of component subnets).
参考答案：B
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第4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
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第5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
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第6题：
路由器R1的拓扑连接和地址分配如图7-11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 1
B．network 10.1.1.1 255.255.255.0 area 0 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
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第7题：
Router R1 has a connected route for 10.1.1.0/24 off interface Fa0/0. Interface Fa0/0 has been enabled for OSPF due to a router ospf 1 and network 10.0.0.0 0.0.0.255 area 0 command. R1 also has EIGRP configured, with the redistribute ospf 1 metric 1000 100 10 1 1500 command configured under EIGRP. Which one of the following is true?（）
- A、R1 will not redistribute 10.1.1.0/24 into EIGRP, because R1 knows it as a connected route and not as an OSPF route.
- B、For any OS PF routes redistributed into EIGRP, the metric components includea value equivalent to 1 Mbps of bandwidth.
- C、For any OSPF routes redistributed into EIGRP, the metric components include a value equivalent to 100 microseconds of delay.
- D、No subnets of network 10.0.0.0 will be redistributed due to the omission of the subnets parameter.
正确答案:B -
第8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9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:B -
第10题：
什么命令序列将配置一个路由器运行OSPF，并添加网络10.1.1.0/24 area0？（）
- A、router ospf area 0 network 10.1.1.0 255.255.255.0 area 0
- B、router ospf network 10.1.1.0 0.0.0.255
- C、router ospf 1 network 10.1.1.0 0.0.0.255 area 0
- D、router ospf area 0 network 10.1.1.0 0.0.0.255 area 0
- E、router ospf network 10.1.1.0 255.255.255.0 area 0
- F、router ospf 1 network 10.1.1.0 0.0.0.255
正确答案:D -
第11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?（）AR1 loses and then re - establishes neighborships with all neighbors.
BR1 no longer advertises 10.1.1.0/24 to neighbors into area 1.
CR1 advertises a 1 0.1.0.0/16 route into area 1 with a metric of 23 (largest metric).
DR1 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12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 32AR1 will not create/flood a type 3 LSA for subnet 10.1.2.0/26 into area 1
BR1 will not create/flood a Type 3 LSA for subnet 1 0.1.2.0/24 into area 1
CR1 will not have an OSPF route for subnet 10.1.2.0/26 in its IP routing tablE
DR1 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 -
第13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).
参考答案：B, D
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第14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
参考答案：E
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第15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
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第16题：
You are troubleshooting an OSPF problem where external routes are not showing up in the OSPF database. Which two options a re valid checks that should be performed first to verify proper OSPF operation?（）
A. Are the ASBRs trying to redistribute the external routes into a totally stubby area?
B. Are the ABRs configured with stubby areas?
C. Is the subnets keyword being used with the redistribution command?
D. Is backbone area (area 0) contiguous?
E. Is the CPU utilization of the routers high?
参考答案：A, C
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第17题：
什么命令序列将配置一个路由器运行OSPF,并添加网络10.1.1.0／24 area0?()A.routerospfarea0network10.1.1.0255.255.255.0area0
B.routerospfnetwork10.1.1.00.0.0.255
C.routerospf1network10.1.1.00.0.0.255area0
D.routerospfarea0network10.1.1.00.0.0.255area0
E.routerospfnetwork10.1.1.0255.255.255.0area0
F.routerospf1network10.1.1.00.0.0.255
参考答案：D
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第18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19题：
You are troubleshooting an OSPF problem where external routes are not showing up in the OSPF database. Which two options a re valid checks that should be performed first to verify proper OSPF operation?（）
- A、Are the ASBRs trying to redistribute the external routes into a totally stubby area?
- B、Are the ABRs configured with stubby areas?
- C、Is the subnets keyword being used with the redistribution command?
- D、Is backbone area (area 0) contiguous?
- E、Is the CPU utilization of the routers high?
正确答案:A,C -
第20题：
On Router R1, process EIGRP 1 is redistributing routes from process OSPF 2, calling route - map fred with the redistribute ospf 2 command. R1 has learned intra - area routes for 10.1.1.0/24 and 10.1.2.0/24 in part due to the Type 2 LSAs known for each subnet. The route map filters route 10.1.1.0/24 and allows 10.1.2.0/24 througH. Which of the following co mmands on router R1 list subnet 10.1.1.0/24?（）
- A、show ip route
- B、show ip eigrp topology
- C、show ip ospf topology
- D、show ip eigrp topology 10.1.1.0/24
正确答案:A,C -
第21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:D -
第22题：
单选题When an OSPF design is planned, which implementation can help a router not have memory resource issues?（）AHave a backbone area (area 0) with 40 routers and use default routes to reach external destinations
BHave a backbo ne area (area 0) with 4 routers and 30,000 external routes injected into OSPF
CHave less OSPF areas to reduce the need for interarea route summarizations
DHave multiple OSPF processes on each OSPF router. Example, router ospf 1, router ospf 2
正确答案： B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?（）AR2's Type 1 LSA
BSubnet 10.1.1.0/24's Type 2 LSA
CABR1's Type 1 LSA in area 0
DSubnet 10.1.1.0/24's Type 3 LSA in Area 0
ESubnet 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R1 has 5 working interfaces, with EIGRP neighbors existing off each interface. R1 has routes for subnets 10.1.1.0/24, 10.1.2.0/24, and 10.1.3.0/24, with EIGRP integer metrics of roughly 1 million, 2 million, a nd 3 million, respectively. An engineer then adds the ip summary - address eigrp 1 10.1.0.0 255.255.0.0 command to interface Fa0/0. Which of the following is true?（）AR1 loses and then reestablishes neighborships with all neighbors.
BR1 no longer advert ises 10.1.1.0/24 to neighbors connected to Fa0/0.
C1 advertises a 10.1.0.0/16 route out Fa0/0, with metric of around 3 million (largest metric of component subnets).
DR1 advertises a 10.1.0.0/16 route out Fa0/0,with metric of around 2 million (med ian metric of component subnets).
正确答案： D解析： 暂无解析