300-410 Route Maps and Route Filtering Practice Question
This 300-410 practice question tests your understanding of route maps and route filtering. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 engineer runs the following command to troubleshoot redistribution with route-maps:
R1# show ip route summary
IP routing table name: Default-IP-Routing-Table(0)
IP routing table maximum-paths: 32
BGP is not receiving any routes, possibly due to filtering.
BGP shows 0 networks and subnets, indicating no routes are being learned via BGP. This could be due to filtering or other issues.
B
EIGRP is redistributing routes into OSPF.
Why wrong: The summary does not show redistribution; it only shows route counts per source.
C
OSPF has more routes than EIGRP.
OSPF has 2 networks and 5 subnets, while EIGRP has 1 network and 2 subnets. So OSPF has more routes.
D
The router has a total of 13 routes.
Why wrong: The total shows 3 networks and 10 subnets, which is 13 routes, but the question asks what the output indicates. Both A and C are correct, but A is more relevant to troubleshooting filtering.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
BGP is not receiving any routes, possibly due to filtering.
The output shows a summary of the IP routing table, listing the number of networks and subnets from each routing source. It indicates that OSPF and EIGRP are contributing routes, while BGP has no 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.
✓
BGP is not receiving any routes, possibly due to filtering.
Why this is correct
BGP shows 0 networks and subnets, indicating no routes are being learned via BGP. This could be due to filtering or other issues.
The total shows 3 networks and 10 subnets, which is 13 routes, but the question asks what the output indicates. Both A and C are correct, but A is more relevant to troubleshooting filtering.
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.
Trap categories for this question
Command / output trap
The summary does not show redistribution; it only shows route counts per source.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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 300-410 OSPF questions on adjacency and route selection.
Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: BGP is not receiving any routes, possibly due to filtering. — The output shows a summary of the IP routing table, listing the number of networks and subnets from each routing source. It indicates that OSPF and EIGRP are contributing routes, while BGP has no routes.
What should I do if I get this 300-410 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 300-410 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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Question Discussion
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