150-130 · Question #110
Your company uses OSPF and has recently purchased another company that uses RIP. Management requires that routes between the two companies be shared without interrupting services on either network…
The correct answer is C. Enable route redistribution in both RIP and OSPF on the ASBR. See the full explanation below for the reasoning.
Question
Your company uses OSPF and has recently purchased another company that uses RIP. Management requires that routes between the two companies be shared without interrupting services on either network. How is this implemented?
Options
- AEnable route redistribution in both RIP and OSPF on the DR.
- BEnable route redistribution in both RIP and OSPF on the BDR.
- CEnable route redistribution in both RIP and OSPF on the ASBR.
- DEnable route redistribution in both RIP and OSPF in the ABR.
How the community answered
(25 responses)- A12% (3)
- B8% (2)
- C76% (19)
- D4% (1)
Community Discussion
10
Carlos M.Feb 9, 2026C is the one. The ASBR (Autonomous System Boundary Router) is specifically the router that sits at the edge between different routing domains, so it is the correct place to configure redistribution to exchange routes between OSPF and RIP without touching the internal design of either network.
Ingrid P.Dec 8, 2025C is the right answer. Route redistribution between different routing protocols, like OSPF and RIP, is configured on the ASBR (Autonomous System Boundary Router), which is specifically the router that sits at the boundary between two different routing domains and handles translating routes between them, not the DR/BDR (which are OSPF-internal election roles) and not the ABR (which connects OSPF areas within a single autonomous system).
Goran A.Dec 8, 2025Ingrid is right that the ASBR owns redistribution, but worth clarifying that an ABR can also be configured as an ASBR simultaneously if it runs a second protocol, so the roles are not mutually exclusive and you will see that topology come up in lab scenarios.
Goran A.Dec 19, 2025C is the only option that makes sense here. The ASBR, Autonomous System Boundary Router, is the device that sits at the edge between two different routing domains, and redistribution is literally its job. DR and BDR are OSPF election roles for multi-access segments, they have nothing to do with exchanging routes between protocols, so A and B are distractors that count on you mixing up router roles. The ABR in D handles inter-area routing within a single OSPF AS, not cross-protocol redistribution, which is a common mix-up I see people make right before exam day. Quick clarifying question for anyone working through this: do you understand why you need to enable redistribution in both directions on the ASBR, meaning both "redistribute RIP into OSPF" and "redistribute OSPF into RIP," or are you clear on what happens if you only configure it one way?
Nina C.Dec 23, 2025Yeah, C is right, the ASBR is the router that sits at the boundary between the two separate routing domains, so it is the one doing the translation work between OSPF and RIP. The DR and BDR are just OSPF roles for managing updates on a multi-access segment, and the ABR only connects areas within the same OSPF domain, so neither of those would make sense here.
Haruki E.Feb 28, 2026I almost marked D because the ABR sits between areas and I was thinking inter-domain, but then I remembered the ABR only moves routes between OSPF areas within the same OSPF domain, while the ASBR is specifically the router that sits at the boundary of two different routing domains and runs both protocols to redistribute between them. Route redistribution between OSPF and RIP belongs on the ASBR, full stop, and neither the DR nor BDR roles have anything to do with redistributing between routing protocols.
Carlos M.Mar 3, 2026Solid breakdown, and worth adding that the ASBR doesn't have to be at the edge of the AS in a topological sense, it just has to be the router configured to redistribute between the two protocols, so it can actually sit anywhere in the OSPF domain including inside an area.
Fatima Z.Feb 18, 2026Why ASBR and not ABR, since ABR also connects different routing domains?
Anjali D.Dec 26, 2025I keep coming back to D on this one because the ABR sits right at the boundary between areas and is the logical place to handle route exchange when you are stitching two different routing domains together. If you configure redistribution on the ABR you get centralized control over what goes in and out without touching every router in the topology.
Nina C.Dec 27, 2025Anjali, the ABR is actually for connecting areas within the same OSPF domain, so redistribution between two different routing domains falls to the ASBR, which is option C, because that is the router specifically designed to sit at the edge of the OSPF domain and exchange routes with outside protocols.