Exam 300-510 All QuestionsBrowse all questions from this exam
Question 69

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.

    Correct Answer:

Discussion
Wippenbug

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

thejag

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.

snowbow

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.

snowbow

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

Seele

This actually makes sense.

onesimogama

someone have the another ospf lab? I take this exam last september and I found two ospf labs

thejag

I took it a couple of months ago and got this same