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Exam 350-401 topic 1 question 1021 discussion

Actual exam question from Cisco's 350-401
Question #: 1021
Topic #: 1
[All 350-401 Questions]

SIMULATION
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Guidelines
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This is a lab item in which tasks will be performed on virtual devices.

• Refer to the Tasks tab to view the tasks for this lab item.
• Refer to the Topology tab to access the device console(s) and perform the tasks.
• Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window.
• All necessary preconfigurations have been applied.
• Do not change the enable password or hostname for any device.
• Save your configurations to NVRAM before moving to the next item.
• Click Next at the bottom of the screen to submit this lab and move to the next question.
• When Next is clicked, the lab closes and cannot be reopened.


Topology
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Tasks
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OSPF is preconfigured on all devices except R30. Configure R30 to complete these tasks.

Task 1:

Configure OSPF according to the topology using these requirements:

• Use Process ID 100.
• Use Loopback0 for the Router ID.
• Advertise all networks into OSPF.
o Use network statements under the OSPF process to accomplish this task.

Task 2:

Configure a/18 summary route for Area 50.

• Advertise only Type 3 LSAs into Area0.


R30
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Taskmaster79
Highly Voted 3 months, 1 week ago
From MS Copilot summary-address: This command is used on Autonomous System Boundary Routers (ASBRs) to summarize external routes that have been redistributed into the OSPF domain. It generates Type 5 LSAs (External LSAs). area range: This command is used on Area Border Routers (ABRs) to summarize routes within the OSPF domain. It generates Type 3 LSAs (Summary LSAs) to advertise summarized routes between OSPF areas. Task 1 router ospf 100 router-id 3.3.3.3 network 10.10.30.0 0.0.0.255 area 0 network 10.20.30.0 0.0.0.255 area 0 network 10.50.40.0 0.0.0.255 area 50 Task 2 router ospf 100 area 50 range 10.50.0.0 255.255.192.0
upvoted 7 times
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RichardIzarra
Most Recent 3 months, 2 weeks ago
Configuración completa: R30(config)# interface Loopback0 R30(config-if)# ip address 10.0.0.1 255.255.255.255 R30(config-if)# no shutdown R30(config-if)# exit R30(config)# router ospf 100 R30(config-router)# router-id 10.0.0.1 R30(config-router)# network 10.10.30.0 0.0.0.255 area 0 R30(config-router)# network 10.20.30.0 0.0.0.255 area 0 R30(config-router)# network 10.50.40.0 0.0.0.255 area 50 R30(config-router)# area 50 range 10.50.0.0 255.255.192.0 R30(config-router)# area 50 stub no-summary
upvoted 3 times
RichardIzarra
3 months, 2 weeks ago
R30(config)# interface Loopback0 R30(config-if)# ip address 10.0.0.1 255.255.255.255 R30(config-if)# no shutdown R30(config-if)# exit R30(config)# router ospf 100 R30(config-router)# router-id 10.0.0.1 R30(config-router)# network 10.10.30.0 0.0.0.255 area 0 R30(config-router)# network 10.20.30.0 0.0.0.255 area 0 R30(config-router)# network 10.50.40.0 0.0.0.255 area 50 R30(config-router)# area 50 range 10.50.0.0 255.255.192.0 R30(config-router)# area 50 stub
upvoted 2 times
jmarko80
1 month, 2 weeks ago
Router ospf 100 area 50 stub no-summary ( area 50 must be a totally stub area, in order for R20 to not flood type3 and type5 lsa ( stub area pnly filter type 5 Lsa) Bu t the configuration of a totaly stub/stub area need all the router in the area to be configured. So this is not the correct method. The right method is to use prefix list on R20 to filter type 3 lsa ( any) in area 50
upvoted 2 times
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abrielirus123
4 weeks ago
Using stub area for area 50 can only be used if R50 also has area 50 configured as stub, otherwise the neighborship will be dropped. Totally stubby is even worse idea as it will block the type 3 LSAs as well, which is needed to summarize. The "area 50 range x.x.x.x y.y.y.y" will generate an LSA type 3 towards area 0, which is what we want. If there are other redistributed routes on R50 advertised outside of the /18 summary route, then jmarko80 is right, and we need to filter them out with a distribute-list or a route-map. See this article on LSA type 5 filtering: https://networklessons.com/ospf/ospf-lsa-type-5-filtering-on-cisco-ios
upvoted 1 times
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issa1430
4 months, 1 week ago
router ospf 100 router-id 10.0.0.1 network 0.0.0.0 255.255.255.255 area 50 area 50 range 10.50.0.0 255.255.192.0
upvoted 1 times
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cjoyce1980
4 months, 3 weeks ago
Task 1 would be: router ospf 100 router-id 10.0.0.1 network 10.10.30.0 0.0.0.255 area 0 network 10.20.30.0 0.0.0.255 area 0 network 10.50.40.0 0.0.0.255 area 50 network 30.30.30.30 0.0.0.0 area 0 Task 2 would be to add area 50 range 10.50.0.0 255.255.192.0 The given answer is incorrect
upvoted 2 times
warriorseby
4 months, 1 week ago
may I ask why you added the "network 30.30.30.30 0.0.0.0 area 0" command?
upvoted 2 times
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Rfvaz
5 months, 2 weeks ago
Correct: router ospf 100 area 50 range 10.50.0.0 255.255.192.0
upvoted 2 times
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Rfvaz
5 months, 2 weeks ago
### Only type 3 = ABR or Area Border Router (we don't use "summary-address" for ABR) router ospf 100 area 0 range 10.50.0.0 255.255.192.0
upvoted 1 times
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0ed2da0
5 months, 3 weeks ago
area 50 stub no-summary
upvoted 1 times
Kdom07
4 months, 4 weeks ago
do not include "no-summary" this makes it Totally Stubby which will not allow for Type 3 LSA's
upvoted 2 times
Kdom07
4 months, 4 weeks ago
actually no, if "area 50 stub" cannot be placed on the adjacent router as well, the adjaceny will fail. I believe simply the "area 50 range" command will allow just a summary LSA Type 3
upvoted 2 times
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