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Question 900

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 partially configured. Complete the OSPF configurations to achieve these goals:

1. Configure R3 and R20 so they do not participate in a DR/BDR election process in Area 20.

2. Configure R10 so it is always the DR for Area 10. Do not change the router ID.

    Correct Answer:

Discussion
kivi_bg

the answer is wrong for the task 1.Just tested it - If you use priority 0 on both routers the routers will stay in 2WAY/DROUTER which means they try to elect DR and BDR and the task ask you to make R20 and R3 to not participate in a election of DR and BDR this means you need to use - ip ospf network point-to-point on both routers interfaces.

Mizuchan

R20 interface eth0/0 ip ospf network point-to-point R3 interface eth0/1 ip ospf network point-to-point R10 interface eth0/0 ip ospf priority 255

Mizuchan

Shouldnt we use ospf process id and area in the command? like this: R20 interface eth0/0 ip ospf <process-id> area 20 network point-to-point R3 interface eth0/1 ip ospf <process-id> area 20 network point-to-point R10 interface eth0/0 ip ospf <process-id> area 10 priority 255

ROBZY90

Depends on the router model and the testing platform you are using. Tried this using the Boson NetSim environment and it does not support 'ip ospf <process-id> area 10> commands however I agree this would be a more suitable application. Either way the neighbours form a PtP network with no election or no attempt to elect DR or BDR.

ERGEGA

That1s correct, On R20 and R3 area 20 if you put the priority 0 the routers will stay in 2WAY/DROUTER. Ether way on OSPF for not participating on election process there is no except the ip ospf network point-to-point.

80085

Shouldnt we configure an ospf point to point network for task 1? if we do that, then there is no DR/BDR so then there is no participation.

incognitoborg

I'm also curious why point-to-point would be wrong, unless they don't care which method you use. Does anyone know?

cloud29

because you would need to use it on both routers. And they say that only R20 eth0/0 cant participate on DR/BDR

cloud29

%OSPF-4-NET_TYPE_MISMATCH: Received Hello from 1.1.1.1 on GigabitEthernet0/0 indicating a potential network type mismatch Thats why you need to use Priority 0 on R20

JasonPhi

passed the exam today. I got 5 labs: eBGP, VRF tunnel, static IP route VRF, troubleshooting port channel, trunk and spanning tree, and OSPF filter-list

Swiz005

I had this LAP in my test. task 1 was DR and task 2 to summarise in AREA 10

Kev7

And it works in the lab? I had the exam today, I used the ip ospf priority 255 in the interface, but it doesn't work, R10 continues with the DR, I saw that was because R10 had a better loopback interface number, but the lab said you cannot modify the router-id.

Amfa

To refresh DR/BDR you have to use command "clear ip ospf processes'

Kev7

I used but it doesn't work too, any other option?

Amfa

Just tested in eve ng. I had to clear ip ospf process on both routers and after that DR changed to higher priority router (higher priority always win). When I tried to clear ospf process only on one side it didn't work. Kev7 what Labs you had on exam and are those dumbs still valid? or maybe there are new questions? Did you passed?

yasmiine

I don't speak english but i want try to give you some feedback on my CCNP exam if that helps. I passed the exam a few days ago, there are 89 questions and 5 labs : labs BGP (Q896), IPsec Q878, this lab OSPF (Q900) but questions about this lab are a bit different: (if i remember) configure R10 so it will not participate in a DR/BDR election without using the "command network point-to-point". The 2nd question is to make configuration so that R20 will be "BDR". The two others labs are about toubleshooting port channel, create one vlan, trunk in order to make ping between PCs ( this lab is not difficult).

Tadese

the provided correct without any doubt Ip ospf 1 priority 0 ----No participation DR/BDR Ip ospf 1 priority 255--

supershysherlock

Setting the OSPF interface to point-to-point mode is more effective at achieving the objectives because it explicitly configures the interface to operate as a point-to-point link. This configuration ensures that the interface does not participate in the DR/BDR election process, regardless of the OSPF priority setting

Dalik

900. - the lab was slightly different then the one described here - it had two tasks: 1. R2 should be DR for area 10 - so you must configure e0/1 of R2 with the best priority (I put 255, but I think the priority of R10 e0/0 was default 1 so it is not necessary to use 255) 2. R2 should summarize routes into area 10 - I let the task be - no time to find solution

Dalik

896. - exactly the same case as described here

Dalik

878. This lab is exactly described here on examtopics. tunnel0 interfaces are already created without tunnel source <interface> configuration and protection solution: - remember ip addresses of tunnel - add the interface tunnel into vrf CORP - assign the remembered IP addresses - configure tunnel source - configure predefine protection ipsec profile - create static routes on both routes in vrf CORP I tried to put interfaces (of both tunnel routers) connecting ISP router into the vrf CORP but I was not able to do it so I return interfaces back to origin state - I am not sure where I did mistake. By the way: the interface to ISP is ospf point-to-point and assigned into area 0 (ip ospf 100 area 0.0.0.0). When I checked routing table (show ip route vrf CORP) I saw the opposite network in the routing table of both routers behind tunnel0 interface so I run on next question.

Dalik

801. this lab had three tasks: 1. PC1 connected over e0/4 should be immediately ready to work when port is UP e0/4 is access port solution: spanning-tree portfast edge (not sure if is OK) 2. problem on trunk link between one of distribution switches (DISTRO-SW) and ACCESS-SW missing VLAN 100 on e0/0 solution: switchport trunk allowed vlan add 100 3. problem with LACP ports e0/2 and 0/3 are not assigned into Portchannel solution: interface range e0/2 - 3 channel-group 1 mode active

wengzaii96

Thak you

DarekD

Hi I took the exam today 14.06.2024 I had 89 questions and 5 labs: 900 (the schema was identical but two tasks were completely different: on R3 you had to set LSA filtering and on R2 you had to fit LSA type 3 and type 5 as far as I remember. Another lab had the first task of configuring ospf without using the "network" command the second task I don't remember the schematic of this lab I didn't see on examtopic. Very similar lab to 801, identical to 878, identical to 896. Of these 89 questions I think >15 were completely new not appearing on examtopic.

MSoares

Hello colleagues, I just finished the exam few minutes ago. So, there were like 10-15 new questions that I did not find here. I had 5 labs with slightly changes: - OSPF DR BDR 2 - VRF - LACP - PVST+ - eGBP - ACL & Copp

RasoulZayer

this lab was in the exam today

IgorLVG

keep in mind both way, using p-to-p solution and using oncly op ospf priority... i have read in some labs that we requierd not using the first way.

Mizuchan

It looks correct.

Luiggi

There is no problem resolving the lab with the "ip ospf network point-to-point" option, it is not stated that "ip ospf priority" should be used. I believe it is a matter of personal choice.

post20

I think what they are looking for is focusing on priorities. when you set the priority to 0 a Router won't be elected as DR or BDR. Also, priorities go from 0 to 255 being 255 the higher number. When you set the priority to 255 the Router will be always elected as the DR, unless there is another router using 255 as priority. In that situation, the tie-breaker would be the highest OSPF router ID.