- A
A stub router configured with the 'leak-map' option can advertise specific routes learned from other EIGRP neighbors beyond the stub restrictions.
The leak-map feature allows a stub router to selectively advertise routes that would otherwise be blocked by the stub restriction, enabling controlled transit of certain routes.
- B
When a router is configured as an EIGRP stub with the 'connected' keyword, it automatically advertises all connected interfaces, including passive interfaces, to its neighbors.
Why wrong: The 'connected' keyword only advertises connected routes that are part of the EIGRP process; passive interfaces are still advertised if they are in the EIGRP network statement, but the stub does not automatically include all connected interfaces unless they are explicitly in the EIGRP configuration.
- C
If a stub router receives a query from its neighbor, it will reply with an 'infinite metric' (unreachable) for all routes that are not in its routing table, including those learned via redistribution.
A stub router cannot forward queries to other neighbors; it replies immediately with an unreachable metric for any route it does not have, including redistributed routes, to prevent query propagation.
- D
The command 'show ip eigrp topology all-links' on a stub router displays only the routes that are in the routing table, as stub routers do not store feasible successors.
Why wrong: The 'all-links' option displays all EIGRP-learned routes, including feasible successors, regardless of stub status. Stub routers can still store feasible successors if they have multiple paths.
- E
An EIGRP stub router configured with the 'static' keyword will automatically redistribute all static routes into EIGRP, even if the 'redistribute static' command is not present.
Why wrong: The 'static' keyword only allows the stub router to advertise static routes that are explicitly redistributed using the 'redistribute static' command under the EIGRP process; it does not enable automatic redistribution.
300-410 EIGRP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of eigrp troubleshooting. 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.
Which TWO statements correctly describe the behavior of EIGRP stub routing and its impact on troubleshooting? (Choose TWO.)
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
A stub router configured with the 'leak-map' option can advertise specific routes learned from other EIGRP neighbors beyond the stub restrictions.
EIGRP stub routing restricts the types of queries sent to a stub router and prevents it from acting as a transit router. Leak-map allows selective leaking of routes. The stub router does not send queries to its neighbors, but it can still receive queries from them. 'show ip eigrp topology' shows all routes, not just stub-learned ones. The 'connected' keyword only advertises connected routes, not summary or static unless specified.
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.
- ✓
A stub router configured with the 'leak-map' option can advertise specific routes learned from other EIGRP neighbors beyond the stub restrictions.
Why this is correct
The leak-map feature allows a stub router to selectively advertise routes that would otherwise be blocked by the stub restriction, enabling controlled transit of certain routes.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
When a router is configured as an EIGRP stub with the 'connected' keyword, it automatically advertises all connected interfaces, including passive interfaces, to its neighbors.
Why it's wrong here
The 'connected' keyword only advertises connected routes that are part of the EIGRP process; passive interfaces are still advertised if they are in the EIGRP network statement, but the stub does not automatically include all connected interfaces unless they are explicitly in the EIGRP configuration.
- ✓
If a stub router receives a query from its neighbor, it will reply with an 'infinite metric' (unreachable) for all routes that are not in its routing table, including those learned via redistribution.
- ✗
The command 'show ip eigrp topology all-links' on a stub router displays only the routes that are in the routing table, as stub routers do not store feasible successors.
Why it's wrong here
The 'all-links' option displays all EIGRP-learned routes, including feasible successors, regardless of stub status. Stub routers can still store feasible successors if they have multiple paths.
- ✗
An EIGRP stub router configured with the 'static' keyword will automatically redistribute all static routes into EIGRP, even if the 'redistribute static' command is not present.
Why it's wrong here
The 'static' keyword only allows the stub router to advertise static routes that are explicitly redistributed using the 'redistribute static' command under the EIGRP process; it does not enable automatic redistribution.
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
Keyword trap
The 'connected' keyword only advertises connected routes that are part of the EIGRP process; passive interfaces are still advertised if they are in the EIGRP network statement, but the stub does not automatically include all connected interfaces unless they are explicitly in the EIGRP configuration.
Command / output trap
The 'static' keyword only allows the stub router to advertise static routes that are explicitly redistributed using the 'redistribute static' command under the EIGRP process; it does not enable automatic redistribution.
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 300-410 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 300-410 question test?
EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: A stub router configured with the 'leak-map' option can advertise specific routes learned from other EIGRP neighbors beyond the stub restrictions. — EIGRP stub routing restricts the types of queries sent to a stub router and prevents it from acting as a transit router. Leak-map allows selective leaking of routes. The stub router does not send queries to its neighbors, but it can still receive queries from them. 'show ip eigrp topology' shows all routes, not just stub-learned ones. The 'connected' keyword only advertises connected routes, not summary or static unless specified.
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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Last reviewed: Jun 18, 2026
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