Exam 300-410 topic 1 question 254 discussion

Actual exam question from Cisco's 300-410

Question #: 254
Topic #: 1

Refer to the exhibit. A network engineer must establish communication between three different customer sites with these requirements:
* Site-A: must be restricted to access to any users at Site-B or Site-C.
* Site-B and Site-C: must be able to communicate between sites and share routes using OSPF.
PE interface configuration:
interface FastEthernet0/0
ip vrf forwarding Site-A
!
interface FastEthernet0/1
ip vrf forwarding SharedSites
!
interface FastEthernet0/2
ip vrf forwarding SharedSites
Which configuration meets the requirements?

A. PE(config)#router ospf 10 vrf Site-A PE(config-router)#network 0.0.0.0 255.255.255.255 area 0 PE(config)#router ospf 10 vrf SharedSites PE(config-router)#network 0.0.0.0 255.255.255.255 area 1
B. PE(config)#router ospf 10 vrf Site-A PE(config-router)#network 0.0.0.0 255.255.255.255 area 0 PE(config)#router ospf 20 vrf SharedSites PE(config-router)#network 0.0.0.0 255.255.255.255 area 1
C. PE(config)#router ospf 10 vrf Site-A PE(config-router)#network 0.0.0.0 255.255.255.255 area 0 PE(config)#router ospf 10 vrf SharedSites PE(config-router)#network 0.0.0.0 255.255.255.255 area 0
D. PE(config)#router ospf 10 vrf Site-A PE(config-router)#network 0.0.0.0 255.255.255.255 area 0 PE(config)#router ospf 20 vrf SharedSites PE(config-router)#network 0.0.0.0 255.255.255.255 area 0

Show Suggested Answer

Suggested Answer: D 🗳️

by chris7890 at Sept. 18, 2022, 6:41 p.m.

Comments

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jarz

Highly Voted 2 years, 10 months ago

Selected Answer: D

Answer is D And before you ask, you need unique process IDs in each VRF.

upvoted 23 times

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1chung

Most Recent 4 months, 3 weeks ago

Selected Answer: B

I think is B

upvoted 1 times

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CiscoTerminator

6 months, 2 weeks ago

Selected Answer: B

what is wrong with B and having different areas? not getting that part.

upvoted 2 times

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diskman

1 year, 4 months ago

Selected Answer: D

The OSPF area must be 0 for the both OSPF VRF instances and the OSPF process ID must be different for each respectively

upvoted 2 times

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Rajnivas02

1 year, 4 months ago

I would choose Answer D as it's in only area 0 B also correct as the traffic can flow between areas. Anythoughts ?

upvoted 2 times

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bk989

1 year, 5 months ago

B also has different process-id: why cannot use two ospf Domains?

upvoted 1 times

d8a1b94

1 year, 4 months ago

Hey bk For me, B is disqualified since the OSPF config for vrf "SharedSites" only contains a area 1 network and this implicit means that there is no area 0 which is mandatory.

upvoted 1 times

bk989

1 year ago

area 0 is not mandatory in OSPF. However area 0 is mandatory to propagate routes in OSPF I think (this is where LSA 1 and 2 becomes LSA 3) ~ so to share info between router a to b and c b and c should be in area 0. Better to lab this I think.

upvoted 1 times

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