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Question 251 - 300-410 discussion

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Refer to the exhibit. The ISP router is fully configured for customer A and customer B using the VRFLite feature. What is the minimum configuration required for customer A to communicate between routers A1 and A2?

A.

A1:

interface fa0/0

description To->ISP

ip vrf forwarding A

ip add 172.31.100.1 255.255.255.0

no shut

!

router ospf 100

net 172.31.100.1 0.0.0.255 area 0

A2:

interface fa0/0

description To->ISP

ip vrf forwarding A

ip add 172.31.200.1 255.255.255.0

no shut

!

router ospf 100

net 172.31.200.1 0.0.0.255 area 0

Answers
A.

A1:

interface fa0/0

description To->ISP

ip vrf forwarding A

ip add 172.31.100.1 255.255.255.0

no shut

!

router ospf 100

net 172.31.100.1 0.0.0.255 area 0

A2:

interface fa0/0

description To->ISP

ip vrf forwarding A

ip add 172.31.200.1 255.255.255.0

no shut

!

router ospf 100

net 172.31.200.1 0.0.0.255 area 0

B.

A1:

interface fa0/0

description To->ISP

ip add 172.31.200.1 255.255.255.0

no shut

!

router ospf 100

net 172.31.200.1 0.0.0.255 area 0

A2:

interface fa0/0

description To->ISP

ip add 172.31.100.1 255.255.255.0

no shut

router ospf 100

net 172.31.100.1 0.0.0.255 area 0

Answers
B.

A1:

interface fa0/0

description To->ISP

ip add 172.31.200.1 255.255.255.0

no shut

!

router ospf 100

net 172.31.200.1 0.0.0.255 area 0

A2:

interface fa0/0

description To->ISP

ip add 172.31.100.1 255.255.255.0

no shut

router ospf 100

net 172.31.100.1 0.0.0.255 area 0

C.

A1:

interface fa0/0

description To->ISP

ip vrf forwarding A

ip add 172.31.100.1 255.255.255.0

no shut

router ospf 100 vrf A

net 172.31.100.1 0.0.0.255 area 0

A2:

interface fa0/0

description To->ISP

ip vrf forwarding A

ip add 172.31.200.1 255.255.255.0

no shut

router ospf 100 vrf A

net 172.31.200.1 0.0.0.255 area 0

Answers
C.

A1:

interface fa0/0

description To->ISP

ip vrf forwarding A

ip add 172.31.100.1 255.255.255.0

no shut

router ospf 100 vrf A

net 172.31.100.1 0.0.0.255 area 0

A2:

interface fa0/0

description To->ISP

ip vrf forwarding A

ip add 172.31.200.1 255.255.255.0

no shut

router ospf 100 vrf A

net 172.31.200.1 0.0.0.255 area 0

D.

A1:

interface fa0/0

description To->ISP

ip add 172.31.100.1 255.255.255.0

no shut

router ospf 100

net 172.31.100.1 0.0.0.255 area 0

A2:

interface fa0/0

description To->ISP

ip add 172.31.200.1 255.255.255.0

no shut

router ospf 100

net 172.31.200.1 0.0.0.255 area 0

Answers
D.

A1:

interface fa0/0

description To->ISP

ip add 172.31.100.1 255.255.255.0

no shut

router ospf 100

net 172.31.100.1 0.0.0.255 area 0

A2:

interface fa0/0

description To->ISP

ip add 172.31.200.1 255.255.255.0

no shut

router ospf 100

net 172.31.200.1 0.0.0.255 area 0

Suggested answer: C

Explanation:

A1 and A2 routers do not know they belong to VRF A. The two interfaces of ISP (which are connected to A1 & A2) should be configured like this (we only show the configure of one interface): ISP router: interface g0/0 description ISP- >To_CustomerA ip vrf forwarding A ip address 172.31.100.2 255.255.255.0 router ospf 100 vrf A network 172.31.200.2 0.0.0.255 area 0

asked 07/10/2024
Vigen Pillay
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