This 200-901 practice question tests your understanding of network fundamentals. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network administrator is asked to reduce the size of the routing table on a core router. The router currently has many /24 routes learned via BGP. Which technique will most effectively reduce the number of routes without losing reachability to all subnets?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement route summarization on the BGP neighbor.
Route summarization (aggregation) combines multiple specific routes into a larger prefix. Option A is wrong because static routes are not dynamic and don't reduce BGP table. Option B is wrong because default route only covers traffic not in table, but you lose granularity. Option C is wrong because removing BGP altogether loses routes.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Implement route summarization on the BGP neighbor.
Why this is correct
Summarization reduces the number of prefixes advertised and installed.
Static routes do not scale and would require manual updates.
✗
Remove all BGP learned routes and use only OSPF.
Why it's wrong here
This would lose external connectivity.
✗
Configure a default route to the upstream provider.
Why it's wrong here
A default route only works for internet-bound traffic, not for internal subnets.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 200-901 OSPF questions on adjacency and route selection.
Network Fundamentals — This question tests Network Fundamentals — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Implement route summarization on the BGP neighbor. — Route summarization (aggregation) combines multiple specific routes into a larger prefix. Option A is wrong because static routes are not dynamic and don't reduce BGP table. Option B is wrong because default route only covers traffic not in table, but you lose granularity. Option C is wrong because removing BGP altogether loses routes.
What should I do if I get this 200-901 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 200-901 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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