Refer to the exhibit.
If OSPF is implemented on the network, which additional configuration is needed to allow traffic
from host 10.4.1.15/24 to host 10.1.2.20/24?
A.
A virtual link between router 2 and router 4
B.
A virtual link between router 3 and router 4
C.
A virtual link between router 2 and router 3
D.
The current design allows traffic between the two hosts.
Of course without knowing what area those subnets are part of you can’t be sure.
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It can work if you redistribute the connected interfaces into OSPF but then the answer would be “redistribute …” which is not an option.
Horrible question!
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Traffic from hosts on R4 to R1 would indeed need a virtual link, since area 0.0.0.2 is not connected to the backbone area of 0.0.0.0 However, this specific traffic from 10.4.1.0/24 to 10.1.2.0/24 (if part of OSPF area 1) would work because this traffic crosses only over the single OSPF area of 0.0.0.1.
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