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Exam 350-401 topic 1 question 745 discussion

Actual exam question from Cisco's 350-401
Question #: 745
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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Configure OSPF on both routers according to the topology to achieve these goals:

1. Ensure that all networks are advertised between the routers without using the “network” statement under the “router ospf” configuration section.
2. Configure a single command on both routers to ensure:
• The DR/BDR election does not occur on the link between the OSPF neighbors.
• No extra OSPF host routes are generated.



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asjose1
Highly Voted 1 year ago
On R1 interface loopback 0 ip ospf 1 area 0 interface e0/0 ip ospf 1 area 0 ip ospf network-type point-to-point On R2 interface loopback 0 ip ospf 1 area 0 interface e0/0 ip ospf 1 area 0 ip ospf network-type point-to-point
upvoted 12 times
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bier132
Highly Voted 11 months, 3 weeks ago
• No extra OSPF host routes are generated. What does it mean? We can prevent DR/BDR election by configuring the Ethernet link to OSPF type point-to-point OR point-to-mulitpoint. If you choose point-to-mulitpoint for whatever reason, OSPF will create a extra host route for every multipoint neighbor in that segment. Just choose point-to-point and you accomplish both tasks (no DR/BDR - no extra host route). Tested with IOS-XE 17.3.4a in GNS3
upvoted 7 times
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mgiuseppe86
Most Recent 10 months ago
So guys, the answer is in the question "2. Configure a single command on both routers to ensure:" a SINGLE command... what single command accomplishes both of those tasks? ip ospf network-type point-to-point and that's it.
upvoted 1 times
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[Removed]
1 year ago
To me, the answer seems correct. On R1 and R2, configure the ospf process under the interfaces R1/R2 interface loopback 0 ip ospf 1 area 0 interface e0/0 ip ospf 1 area 0 ip ospf network-type point-to-point The confusing part could be the last statement "no extra ospf host routes are generated" I'm not sure what they mean by this, but the suggestion to configure OSPF with passive interface default doesn't fit the requirement. Passive-interface prevents Hellos from being advertised on the link, which prevents OSPF from forming neighborships. This does not prevent OSPF from advertising routes if A) they fall within the network statement, and B) the link is configured to be part of the OSPF process ID
upvoted 3 times
teikitiz
12 months ago
I was considering prefix-suppression for the "no extra ospf host routes are generated" (the link between routers has no hosts), but it doesn't seem to apply to this simple topology. My 1 cent.
upvoted 2 times
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owenshinobi
1 year, 2 months ago
my config R1 Router ospf 1 Passive interface default Interface loopback 0 Ip ospf 1 area 0 Ip ospf 1 area 0 network-type point-to-point no passive interface Interface Ether0/0 ip ospf 1 area 0 ip ospf 1 area 0 network-type point-to-point no passive interface R2 Router ospf 1 passive interface default interface loopback 0 ip ospf 1 area 0 ip ospf 1 aera 0 network-type point-to-point interface Ether0/0 ip ospf 1 area 0 ip ospf 1 area 0 network-type point-to-point please verify
upvoted 2 times
owenshinobi
1 year, 2 months ago
editanswer: R1 Router ospf 1 Passive interface default no passive interface loopback 0 no passive interface Ether0/0 Interface loopback 0 Ip ospf 1 area 0 Ip ospf 1 area 0 network-type point-to-point Interface Ether0/0 ip ospf 1 area 0 ip ospf 1 area 0 network-type point-to-point Copy running-config startup-config R2 Router ospf 1 passive interface default no passive interface loopback 0 no passive interface Ether0/0 interface loopback 0 ip ospf 1 area 0 ip ospf 1 aera 0 network-type point-to-point interface Ether0/0 ip ospf 1 area 0 ip ospf 1 area 0 network-type point-to-point copy running-config startup-config
upvoted 2 times
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gibblock
1 year, 3 months ago
My understanding of this question is as following 1. under "router ospf" a non network statement #router ospf 1 #redistribute connected subnets 2. a single command - must be the network point-to-point under interface configuration #ip ospf network point-to-point #ip ospf 1 area 0 R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 2.2.2.2 0 FULL/ - 00:00:37 192.168.0.2 GigabitEthernet0/0 R1#show ip ospf route O E2 2.2.2.2 [110/20] via 192.168.0.2, 00:01:24, GigabitEthernet0/0 # copy running-config startup-config
upvoted 1 times
HungarianDish_111
1 year, 3 months ago
However, this might be a correct solution, I do not think that this is a typical case of redistributing routes into OSPF. With redistribution, the router becomes an ASBR which is unnecessary for this design. Also, type 5 LSA and type 4 LSA are then generated unnecessairily. With redistribution, the connected routes come in as external routes. It really think that in this task all routes should belong to the OSPF domain. We can achive this by enabling the protocol on the interface (ip ospf 1 are 0 ). Why would we want to complicate things?
upvoted 3 times
gibblock
1 year, 3 months ago
After re-reading the task 1. for maybe the 10th time I think you are right. It is not an actual must to use the "router ospf" command, but instead the alternative. My bad.
upvoted 2 times
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gibblock
1 year, 3 months ago
It's not about complicating things, just following the requirements. It clearly states that the configuration should be set under "router ospf". While I agree on the unnecessary ASBR role, it fulfills the task of distributing the networks without the network command. Regarding the "ip ospf 1 area 0" you are not announcing the loopback networks. I tried it on IOL and VIOS, but then again, maybe I misunderstood
upvoted 1 times
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HungarianDish_111
1 year, 3 months ago
The loopbacks should have network type point-to-point, too.
upvoted 2 times
HungarianDish_111
1 year, 3 months ago
Sorry, I did not realize that the loopbacks are set as /32. In this case, the network type does not matter! Task: "No extra OSPF host routes are generated" -> What is the goal of this task then?
upvoted 1 times
owenshinobi
1 year, 2 months ago
Task "No extra OSPF host routes are generated" i config uder router ospf "Passive interface default" and under interface using add command "no passive interface"
upvoted 1 times
zbeugene7
3 weeks, 5 days ago
wrong, all you have to do is enable ospf on the interface : "ip ospf 1 area 0" and make sure no point-tio-point is issued. declaring an OSPF network type of point-to-point on a loopback interface configured with a host IP address will cause the router to advertise that specific IP address (with a /32 mask) into the OSPF domain, rather than the default behavior of advertising it as a stub host route. This is because the ip ospf network point-to-point command overrides the default behavior of treating loopbacks as stub networks with /32 masks
upvoted 1 times
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JackDRipper
1 year, 3 months ago
Maybe it's just /32 in the diagram? I wonder what the loopback ip address config looks like. Only way for that 2nd sub-task to work with the loopback is if the loopback has a mask less than /32.
upvoted 1 times
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HungarianDish_111
1 year, 3 months ago
For no DR/BDR and no host route apply: "ip ospf network point-to-point" under interface config.
upvoted 1 times
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