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Exam 300-510 topic 1 question 128 discussion

Actual exam question from Cisco's 300-510
Question #: 128
Topic #: 1
[All 300-510 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 doses and cannot be reopened.


Topology
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Tasks
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Configure and verify an OSPF neighbor adjacency between R1 and R2 in OSPF area 0 according to the topology to achieve these goals:

1. R1 pings the Loopback0 interface of R2. Use interface-level configuration to complete this task.
2. R2 pings the Loopback0 interface of R1. Use interface-level configuration to complete this task.
3. R2 receives a single summary route 172.16.100.0/22 for networks 172.16.100.0/24, 172.16.101.0/24, and 172.16.103.0/24.

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wlts
7 months ago
Don't Lo10,Lo20,Lo30 interfaces need to add ip ospf 10 area 0 in R1?
upvoted 1 times
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onesimogama
1 year, 5 months ago
someone have the another ospf lab? I take this exam last september and I found two ospf labs
upvoted 1 times
thejag
1 year, 3 months ago
I took it a couple of months ago and got this same
upvoted 1 times
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Wippenbug
1 year, 11 months ago
I don't understand why the loopback must be configured as point to point interfaces. Instead, they should be configured into area 1 to summarize them lateron
upvoted 2 times
thejag
1 year, 6 months ago
OSPF will always advertise the networks on loopback interfaces as /32 networks, even if you have configured them with a different subnet. This is how OSPF operates, and it is even defined within the RFC. If you want to change this behavior, you can use the ip ospf network point-to-point command under the loopback interface configuration mode. This will cause OSPF to advertise the configured subnet mask of the loopback interface.
upvoted 4 times
snowbow
1 year ago
labbed this up and while of course ospf only advertises the /32's, once you configure the area 1 range command it doesnt matter. OSPF only advertises a single /22 without ip ospf point-to-point configured, so not sure why it is still needed.
upvoted 1 times
snowbow
1 year ago
the only thing I can think of, is that the question specifically states that you need to summarize the 3 /24 networks, and technically if you don 't add the p2p command, you aren't summarizing them, you are summarizing 3 /32 networks... I have to suppose that this lab is answered correctly, so I guess I'm going to use the p2p commands
upvoted 1 times
Seele
11 months ago
This actually makes sense.
upvoted 1 times
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