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Exam 300-410 topic 1 question 28 discussion

Actual exam question from Cisco's 300-410
Question #: 28
Topic #: 1
[All 300-410 Questions]


Refer to the exhibit. The network administrator configured the branch router for IPv6 on the E 0/0 interface. The neighboring router is fully configured to meet requirements, but the neighbor relationship is not coming up.
Which action fixes the problem on the branch router to bring the IPv6 neighbors up?

  • A. Disable OSPF for IPv4 using the no ospfv3 4 area 0 ipv4 command under the E 0/0 interface.
  • B. Enable the IPv4 address family under the router ospfv3 4 process by using the address-family ipv4 unicast command.
  • C. Disable IPv6 on the E 0/0 interface using the no ipv6 enable command.
  • D. Enable the IPv4 address family under the E 0/0 interface by using the address-family ipv4 unicast command.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by [deleted] at Aug. 6, 2021, 3:28 p.m.

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Dacusai
Highly Voted 2 years, 9 months ago
I think the question is wrong from the beginning, The appropriate address family is enabled automatically, but at least you should have a link local address for the relation to form.
upvoted 6 times
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[Removed]
Most Recent 9 months, 2 weeks ago
Selected Answer: B
B is correct
upvoted 1 times
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Ll123123
1 year, 6 months ago
Selected Answer: B
i choose B because OSPFv3 configuration require the ipv4 and ipv6 address family configuration under the ospfv3 process.
upvoted 2 times
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Reikidude00
2 years, 9 months ago
Selected Answer: B
B is correct here, af configuration must be done under router-config R1#show running-config | section router router ospfv3 4 router-id 1.1.1.1 ! address-family ipv4 unicast exit-address-family
upvoted 2 times
bk989
1 year, 1 month ago
also to add to this: We need the ospf adjacency to form to exchange routing info, whether the info is ipv4 or ipv6. In this case adjacency is failing because of ipv4 issue.
upvoted 1 times
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Networkingguy
3 years, 2 months ago
Selected Answer: B
B is the correct answer here
upvoted 1 times
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wts
3 years, 3 months ago
Doesn't "address-family ipv4 unicast" automatically appear under the router after adding an interface to OSPF?
upvoted 3 times
wts
3 years, 2 months ago
"The appropriate address family is enabled automatically when OSPFv3 is enabled on an interface.", - cisco official guide.
upvoted 5 times
wts
3 years, 2 months ago
(config)#ipv6 unicast-routing (config)#ipv6 cef (config)#router ospfv3 4 (config-router)#router-id 192.168.1.1 (config)#interface GigabitEthernet0/0 (config-if)#ipv6 enable (config-if)#ipv6 ospf neighbor FE80: - this and the previous commands are needed because the ipv6 address is not specified. (config-if)#ospfv3 4 ipv6 area 0 - this command is missing so that the interface participates in ospfv3 ipv6. (this is the correct order of the keywords, the wrong order is given in the question.) To be honest, I do not know what to do if I get a question like this.
upvoted 4 times
Huntkey
2 years, 7 months ago
Yes but it doesn't appear in the question so someone deliberately removed it. It shows you the running configuration, not the configuration script you would use to configure it.
upvoted 1 times
toto89
2 years, 4 months ago
Yes but I tried to remove the address familly under the OSPFv3 router configuration and it automatically remove OSPFv3 configuration on the interface too. This question is broken, hope they fixed it in the exam.
upvoted 2 times
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Azaelyus
2 years, 3 months ago
call Miroslav Tihlarik
upvoted 1 times
Azaelyus
2 years, 3 months ago
+420725950480
upvoted 1 times
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myrmike
3 years, 4 months ago
spapi0390 is right on. Looking at the config of the interfaces only ospfv3 ipv4 is enabled on the interfaces. The presumption being that the neighbor router is configured for ospfve ipv4 and not ipv6
upvoted 1 times
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Jenia1
3 years, 5 months ago
B is the correct answer, but I totally agree with amgue, the question is about IPv6 and not IPv4, although if you configure OSPFv3 like this, you will see LSA type 8/9, so maybe what they meant, but it is interesting why they call it IPv6 as you also will see LSA type 1/2. Appreciate if someone can shed a light on this
upvoted 4 times
spapi0390
3 years, 5 months ago
With the OSPFv3 address families feature, you may have two device processes per interface, but only one process per AF. If the IPv4 AF is used, an IPv4 address must first be configured on the interface. For IPv6 AF it is enough, if only IPv6 is enabled on the interface, as OSPFv3 uses link-local addresses. A single IPv4 or IPv6 OSPFv3 process running multiple instances on the same interface is not supported.
upvoted 2 times
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amgue
3 years, 5 months ago
I don't understand the answer ! the question is about the enabling Ipv6 neighborship, not IPV4 neighborship, can somewone explain this to me PLEASE ?
upvoted 3 times
spapi0390
3 years, 5 months ago
With the OSPFv3 address families feature, you may have two device processes per interface, but only one process per AF. If the IPv4 AF is used, an IPv4 address must first be configured on the interface. For IPv6 AF it is enough, if only IPv6 is enabled on the interface, as OSPFv3 uses link-local addresses. A single IPv4 or IPv6 OSPFv3 process running multiple instances on the same interface is not supported.
upvoted 5 times
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error_909
3 years, 7 months ago
The given answer is correct
upvoted 1 times
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[Removed]
3 years, 8 months ago
The given answer is correct router ospfv3 [process-id] address-family ipv4 unicast
upvoted 1 times
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