Exam 300-410 topic 1 question 406 discussion

Actual exam question from Cisco's 300-410

Question #: 406
Topic #: 1

An engineer configured VRF-Lite on a router for VRF blue and VRF red. OSPF must be enabled on each VRF to peer to a directly connected router in each VRF. Which configuration forms OSPF neighbors over the network 10.10.10.0/28 for VRF blue and 192.168.0.0/30 for VRF red?

A. router ospf 1 vrf blue
network 10.10.10.0 0.0.0.252 area 0
router ospf 2 vrf red
network 192.168.0.0 0.0.0.240 area 0
B. router ospf 1 vrf blue
network 10.10.10.0 0.0.0.15 area 0
router ospf 2 vrf red
network 192.168.0.0 0.0.0.3 area 0
C. router ospf 1 vrf blue
network 10.10.10.0 0.0.0.240 area 0
router ospf 2 vrf red
network 192.168.0.0 0.0.0.252 area 0
D. router ospf 1 vrf blue
network 10.10.10.0 0.0.0.3 area 0
router ospf 2 vrf red
network 192 168.0.0 0.0.0.15 are 0

Show Suggested Answer

Suggested Answer: B 🗳️

by GReddy2323 at Feb. 6, 2023, 5:40 a.m.

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forccnp

Highly Voted 2 years, 4 months ago

Selected Answer: B

B is correct answer ^_^

upvoted 10 times

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ZamanR

Most Recent 1 year, 7 months ago

B is correct answer

upvoted 1 times

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av3672

1 year, 8 months ago

Selected Answer: C

Both options cover the specified networks, but the wildcard masks in option B are incorrect. The correct wildcard masks for the specified networks are 0.0.0.240 for VRF blue and 0.0.0.252 for VRF red. Therefore, the correct option is: C.

upvoted 1 times

RouterToRooter

1 year, 8 months ago

C is wrong. For 10.10.10.0/28 - subnet mask 255.255.255.240 - wild card 0.0.0.15 For 192.168.0.0/30 - subnet mask 255.255.255.252 - wild card 0.0.0.3

upvoted 3 times

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Hummer1

2 years ago

B is correct, D has the the wild card masks the wrong way round.

upvoted 4 times

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GReddy2323

2 years, 6 months ago

Selected Answer: C

Wouldn't the answer be C? The network commands in B are in wildcard form.

upvoted 2 times

pitcholo

2 years, 6 months ago

Both B & C are correct however using wild card mask is more desirable than using the subnet mask. Quote : In my network implementations, I use the network statements in three different ways: If I have to assign a specific interface into an area, I would always use network x.y.z.w 0.0.0.0 area n; If the area address ranges are nicely assigned (which also helps immensely when you have to start summarizing), you can use a single network statement to cover the whole area. If, for example, area 3 has address range 10.1.16.0/20, use network 10.1.16.0 0.0.15.255 area 3; If the router has all interfaces in a single area, I would almost always use network 0.0.0.0 255.255.255.255 area area-id (unless there is an extremely good reason that some interfaces should not be seen by the OSPF process). Correct answer is B .

upvoted 2 times

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