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Exam 200-301 topic 1 question 1134 discussion

Actual exam question from Cisco's 200-301
Question #: 1134
Topic #: 1
[All 200-301 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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IP connectivity between the three routers is configured. OSPF adjacencies must be established.

1. Configure R1 and R2 Router IDs using the interface IP addresses from the link that is shared between them.
2. Configure the R2 links with a max value facing R1 and R3. R2 must become the DR. R1 and R3 links facing R2 must remain with the default OSPF configuration for DR election. Verify the configuration after clearing the OSPF process.
3. Using a host wildcard mask, configure all three routers to advertise their respective Loopback1 networks.
4. Configure the link between R1 and R3 to disable their ability to add other OSPF routers.

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Suggested Answer:
by kappi91 at Sept. 2, 2023, 2:54 p.m.

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picho707
Highly Voted 1 year, 5 months ago
Task 1 R1(config)#router ospf 1 R1(config-router)#router-id 10.10.12.1 R2(config)#router ospf 1 R2(config-router)#router-id 10.10.12.2 Task 2 R2(config)#interface range gigabitEthernet 0/0 , gigabitEthernet 0/2 R2(config-if-range)#ip ospf priority 255 R2#clear ip ospf process Reset ALL OSPF processes? [no]: y Task 3 R1(config)#router ospf 1 R1(config-router)#network 10.10.1.1 0.0.0.0 area 0 R2(config)#router ospf 1 R2(config-router)#network 10.10.2.2 0.0.0.0 area 0 R3(config)#router ospf 1 R3(config-router)#network 10.10.3.3 0.0.0.0 area 0 Task 4 R1(config)#router ospf 1 R1(config-router)#passive-interface gigabitEthernet 0/1 R3(config)#router ospf 1 R3(config-router)#passive-interface gigabitEthernet 0/1
upvoted 8 times
[Removed]
1 year, 5 months ago
Good, however two problems: Task 3 -> You advertised Loopback0, but the question asked for Loopback1. Task 4 -> You're making the interfaces passive, which will disable all OSPF adjacencies on the segment. However the question asks us to "disable their ability to add other OSPF routers". So the appropriate solution is to make the link type point-to-point using "ip ospf network point-to-point" on the respective interfaces. Other than that it looks good.
upvoted 8 times
picho707
1 year, 4 months ago
Thanks for the comment. I just realized I added the incorrect loopback interface. See below for the correction. In terms of task 4, The question asks not to add any routers. The point-to-point command removes the ability to participate in the DR and BDR selection but still adds the router information to their tables. I stand by my answer. Task 3 R1(config)#router ospf 1 R1(config-router)#network 192.168.1.1 0.0.0.0 area 0 R2(config)#router ospf 1 R2(config-router)#network 192.168.2.2 0.0.0.0 area 0 R3(config)#router ospf 1 R3(config-router)#network 192.168.3.3 0.0.0.0 area 0 Task 4 R1(config)#router ospf 1 R1(config-router)#passive-interface gigabitEthernet 0/1 R3(config)#router ospf 1 R3(config-router)#passive-interface gigabitEthernet 0/1
upvoted 3 times
etoanik
1 year, 3 months ago
I think the wildcard mask should be 192.168.1.1 0.0.0.255 right?
upvoted 6 times
OuaisLeSang
1 year ago
I don't think so, it says "HOST wildcard mask", we must advertise the host not the network
upvoted 4 times
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matass_md
9 months, 1 week ago
Hi there , nice job on the configuration but I want to add a remark . if you use the passive-interface command there will be no OPSF adjacency between them ,meaning it does not do the trick for us . to make task 4 you need to make it point-to-point we don't have DR/BDR election but we have OSPF Hello Packets sending and we have adjacency formed between the routers . Cheers keep up the good work!
upvoted 4 times
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Dronep
Most Recent 7 months, 2 weeks ago
Hi all, i have a doubt for task 4 4. Configure the link between R1 and R3 to disable their ability to add other OSPF routers. I says Disable ability. Does that mean to use "passive-interface" command on the interfaces connected between R1 and R3? Or no network?
upvoted 1 times
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bymrdas
1 year ago
-------------------R1------------------- ! interface GigabitEthernet0/0 ip address 10.10.12.1 255.255.255.0 duplex auto speed auto ! interface GigabitEthernet0/1 ip address 10.10.13.1 255.255.255.0 ip ospf network point-to-point ip ospf priority 1 duplex auto speed auto ! router ospf 1 router-id 10.10.12.1 log-adjacency-changes network 192.168.1.1 0.0.0.0 area 0 ----------------R2--------------------- ! interface GigabitEthernet0/0 ip address 10.10.12.2 255.255.255.0 ip ospf priority 255 duplex auto speed auto ! interface GigabitEthernet0/1 ip address 10.10.23.2 255.255.255.0 ip ospf priority 255 duplex auto speed auto ! router ospf 1 router-id 10.10.12.2 log-adjacency-changes network 192.168.2.0 0.0.0.0 area 0 ---------------R3---------------------- interface GigabitEthernet0/0 ip address 10.10.23.3 255.255.255.0 duplex auto speed auto ! interface GigabitEthernet0/1 ip address 10.10.13.3 255.255.255.0 ip ospf network point-to-point ip ospf priority 1 duplex auto speed auto ! router ospf 1 log-adjacency-changes network 192.168.3.3 0.0.0.0 area 0
upvoted 1 times
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[Removed]
1 year ago
remmember that you must advertise the networks on the 3 routers first, the question says OSPF adjacencies must be established.
upvoted 2 times
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BTK0311
1 year ago
Using a host wildcard mask, configure all three routers to advertise their respective Loopback1 networks so shouldn't it be 192.168.1.1 0.0.0.255 area 0 so shouldn't it be 192.168.2.2 0.0.0.255 area 0 so shouldn't it be 192.168.3.3 0.0.0.255 area 0 since it says networks, IIRC 192.168.1.1 0.0.0.0 is only advertising the host.
upvoted 2 times
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AbdullahMohammad251
1 year, 2 months ago
Hi This is my answer
upvoted 2 times
AbdullahMohammad251
1 year, 2 months ago
The question said the IP connectivity has been configured, this means that the routers can communicate with one another and the interfaces have been configured with the corresponding IPs. To check if the interfaces have been configured with IPs, use the "show ip interface brief" command. Task 1 R1(config)#router ospf 1 R1(config-router)#router-id 10.10.12.1 R1(config-router)# exit R1(config)# do wr R2(config)#router ospf 1 R2(config-router)#router-id 10.10.12.2 R2(config-router)# exit R2(config)# do wr Task 2 R2(config)#interface range gigabitEthernet 0/0 , gigabitEthernet 0/2 R2(config-if-range)#ip ospf priority 255 R2#clear ip ospf process Reset ALL OSPF processes? [no]: yes R2# wr
upvoted 8 times
AbdullahMohammad251
1 year, 2 months ago
Task 3 We only need to advertise the Loopback 1 interface using a host WCM. This means that we need to use the following WCM: 0.0.0.0 We also need to advertise the loopback 1 interface under OSPF process settings, we cannot use the "ip OSPF 1 area 0" command under interface settings. R1(config)# router ospf 1 R1(config-router)# network 192.168.1.1 0.0.0.0 area 0 R1(config-router)# exit R1(config)# do wr R3(config)# router ospf 1 R1(config-router)# network 192.168.3.3 0.0.0.0 area 0 R3(config-router)# exit R3(config)# do wr R2(config)# router ospf 1 R2(config-router)# network 192.168.2.2 0.0.0.0 area 0 R2(config-router)# exit R2(config)# do wr
upvoted 4 times
tumajay
1 year ago
this is wrong. task 3 says to advertise the loopback "networks" not interfaces. so it should be network 192.168.1.0 0.0.0.255 area 0
upvoted 1 times
Lukai
7 months, 3 weeks ago
But its asking to use a host wildcard mask which should be 0.0.0.0 I think?
upvoted 2 times
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AbdullahMohammad251
1 year, 2 months ago
Task 4 It is important to note that Ethernet interfaces use opsf network type broadcast by default, while serial interfaces use Point-to-point links. R1(config)#interface E0/1 R1(config-if)#ip ospf network point0to-point R1(config-if)# exit R1(config)#do wr R3(config)#interface E0/1 R3(config-if)#ip ospf network point0to-point R3(config-if)# exit R3(config)#do wr We can also use "copy run start" to save current configurations to NVRAM
upvoted 3 times
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JunsK1e
1 year, 6 months ago
correct me if I'm wrong R1: ! en conf t router opsf 1 router-id 10.10.12.1 network 192.168.1.1 0.0.0.0 area 0 network 10.10.1.1 0.0.0.0 area 0 passive-interface e0/1 end ! clear ip ospf process (yes) ! ! R2: ! en conf t router ospf 1 router-id 10.10.12.2 network 10.10.2.2 0.0.0.0 area 0 network 192.168.2.2 0.0.0.0 area 0 exit ! ! int range e0/0, e0/2 ip ospf priority 255 exit ! clear ip ospf process (yes) ! ! R3: en conf t router ospf 1 network 10.10.3.3 0.0.0.0 area 0 network 192.168.3.3 0.0.0.0 area 0 passive-interface e0/1 end ! ! clear ip ospf process (yes)
upvoted 4 times
JunsK1e
1 year, 6 months ago
In task 3 you only need advertise the loopback 1
upvoted 1 times
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JunsK1e
1 year, 7 months ago
I think in task #4 you will disable the link between r1 and r3. using passive-interface correct me if I'm wrong!
upvoted 1 times
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kappi91
1 year, 8 months ago
Can somebody give me some feedback: Step 1 -------------- R1 router ospf 1 router-id 10.10.12.1 R2 router ospf 1 router-id 10.10.12.2 Step 2 -------------- int e0/0 ip ospf priority 255 int e0/2 ip ospf priority 255 exit clear ip ospf process show ip ospf neighbors Step 3 -------------- r1 router ospf 1 network 10.10.1.1 0.0.0.0 area 0 r2 router ospf 1 network 10.10.1.2 0.0.0.0 area 0 r3 router ospf 1 network 10.10.1.3 0.0.0.0 area 0 Step 4 -------------- r1 int e0/1 ip ospf network point-to-point r3 int e0/1 ip ospf network point-to-point
upvoted 4 times
laurvy36
1 year, 8 months ago
Yeah, but it will not point for all the requirements
upvoted 1 times
JohnLocke
1 year, 8 months ago
What's missing?
upvoted 1 times
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picho707
1 year, 6 months ago
Step 3 is incorrect for R2 and R3. Step 3 -------------- r1 router ospf 1 network 10.10.1.1 0.0.0.0 area 0 r2 router ospf 1 network 10.10.2.2 0.0.0.0 area 0 r3 router ospf 1 network 10.10.3.3 0.0.0.0 area 0
upvoted 2 times
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JoeShmo
1 year, 6 months ago
On step 3, since it says to advertise respective loopback 1 networks, wouldn't the config be: Step 3 R1 en conf t router ospf 1 network 192.168.1.1 0.0.0.0 area 0 R2 en conf t router ospf 1 network 192.168.2.2 0.0.0.0 area 0 R3 en conf t router ospf 1 network 192.168.3.3 0.0.0.0 area 0
upvoted 2 times
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