CCNP Infrastructure Practice Question
A network engineer is configuring a new Cisco IOS router for OSPFv2 in a multi-area OSPF domain. The router will be an Area Border Router (ABR) connecting Area 0 and Area 10. The engineer must ensure that the router correctly summarizes routes from Area 10 into Area 0 and that it does not become a designated router (DR) on any broadcast network. Which two configuration steps are required to meet these requirements? (Choose two.)
⚠ Common exam trap
The trap here is assuming that configuring an area as stub or changing the reference bandwidth will influence summarization or DR election, when these are unrelated OSPF features.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the OSPF interface priority to 0 on all interfaces that participate in OSPF.
To summarize routes from Area 10 into Area 0, the ABR must use the 'area 10 range' command. To prevent the router from becoming a DR, the OSPF interface priority must be set to 0 on all participating interfaces. These two steps directly satisfy the requirements. The other options either configure stub areas, alter cost calculations, or suppress OSPF on interfaces, none of which meet the stated goals.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Set the OSPF interface priority to 0 on all interfaces that participate in OSPF.
Why this is correct
Setting the OSPF interface priority to 0 prevents the router from being elected as a designated router (DR) or backup designated router (BDR) on broadcast networks. This meets the requirement that the router does not become a DR. The priority is configured per interface with the 'ip ospf priority 0' command under the interface configuration.
- ✗
Configure the router with the 'area 10 stub' command under the OSPF routing process.
Why it's wrong here
The 'area 10 stub' command configures Area 10 as a stub area, which prevents external routes (Type 5 LSAs) from being injected into the area. This is not related to summarizing routes from Area 10 into Area 0. While it can reduce LSDB size, it does not fulfill the summarization requirement and may not be desired if external routes need to be propagated.
- ✗
Configure the router with the 'auto-cost reference-bandwidth 100000' command under the OSPF routing process.
Why it's wrong here
The 'auto-cost reference-bandwidth' command changes the reference bandwidth used to calculate OSPF interface costs. This affects path selection but does not influence summarization or DR election. It is used to accommodate high-speed interfaces (e.g., 10G, 40G) so that they are not assigned the same cost as lower-speed links.
- ✓
Configure the router with the 'area 10 range 10.10.0.0 255.255.0.0' command under the OSPF routing process.
Why this is correct
This command enables inter-area route summarization for Area 10. As an ABR, the router will advertise a single summary route for the 10.10.0.0/16 network into Area 0 instead of individual more-specific routes. This reduces the size of the link-state database and routing tables in other areas. It is a valid and necessary step for summarizing routes from Area 10 into Area 0.
- ✗
Configure the router with the 'passive-interface default' command under the OSPF routing process.
Why it's wrong here
The 'passive-interface default' command suppresses OSPF hello packets on all interfaces by default, which prevents OSPF adjacencies from forming. While it can be used to control which interfaces participate in OSPF, it does not directly prevent the router from becoming a DR on interfaces where OSPF is enabled. It also does not address summarization.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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