JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2023) — Question 48

You were provided a network diagram that told you to number your network from the 191.255.0.0/16 space. OSPF is enabled and adjacencies are up, but no routers are learning any routes. What can explain this?

Answer options

• A. The default OSPF export policies advertise nothing, so you need to apply export policy
• B. The default OSPF import policy rejects all OSPF routes, so you need to apply import policy
• C. You need to modify the martian table with a 191.255.0.0/16 accept statement
• D. You need to enable OSPF on the lo0 interface to provide a route to the RID of each router in the network

Correct answer: C

Explanation

The correct answer is C because the martian table must allow the 191.255.0.0/16 network for OSPF to function properly. Options A and B are incorrect because they refer to export and import policies that do not directly impact the learning of routes in this context. Option D is also incorrect, as enabling OSPF on the lo0 interface is not necessary for the routers to learn routes within the provided network space.