The correct interpretation is that neighbor 10.2.2.2 is not sending any routes, as indicated by the State/PfxRcd column showing 0 prefixes received. This output from the show bgp summary command reveals that while both BGP peers are in an established state (no error codes in the State column), the second neighbor has not advertised any prefixes, which typically points to a filtering issue, a missing network statement, or an empty BGP table on the remote side. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to differentiate between a BGP session being up versus actually exchanging routes—a common trap where candidates assume a neighbor in the established state is fully functional. The key metric to watch is the PfxRcd count; a zero here means no routes are being learned, even if the session appears healthy. Memory tip: think of PfxRcd as “prefixes received”—if it’s zero, the neighbor is silent, not broken.
300-410 BGP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of bgp 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.
A network engineer runs the following command to troubleshoot a BGP Troubleshooting issue:
R1# show bgp ipv4 unicast summary
BGP router identifier 1.1.1.1, local AS number 65000
BGP table version is 15, main routing table version 15
2 network entries using 288 bytes of memory
2 path entries using 160 bytes of memory
2/2 BGP path/bestpath attribute entries using 296 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
Bitfield cache entries: current 1 (at peak 1) using 32 bytes of memory
BGP using 800 total bytes of memory
BGP activity 6/0 prefixes, 6/0 paths, scan interval 60 secs
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Neighbor 10.2.2.2 is not sending any routes, possibly due to filtering or no routes to advertise.
The show bgp summary output shows BGP neighbor states and prefix counts. Neighbor 10.1.1.2 is up and has sent 2 prefixes. Neighbor 10.2.2.2 is up but has sent 0 prefixes, indicating a possible issue with route advertisement or filtering.
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.
✗
Both neighbors are fully operational and exchanging routes.
Why it's wrong here
Neighbor 10.2.2.2 has 0 prefixes received, indicating a problem.
✗
Neighbor 10.1.1.2 is not sending any routes.
Why it's wrong here
Neighbor 10.1.1.2 has 2 prefixes received.
✓
Neighbor 10.2.2.2 is not sending any routes, possibly due to filtering or no routes to advertise.
Why this is correct
The PfxRcd column shows 0 for 10.2.2.2, meaning no prefixes are received from that neighbor.
The state shows an Up/Down time, so the session is up.
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 state shows an Up/Down time, so the session is up.
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.
BGP Troubleshooting — This question tests BGP Troubleshooting — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Neighbor 10.2.2.2 is not sending any routes, possibly due to filtering or no routes to advertise. — The show bgp summary output shows BGP neighbor states and prefix counts. Neighbor 10.1.1.2 is up and has sent 2 prefixes. Neighbor 10.2.2.2 is up but has sent 0 prefixes, indicating a possible issue with route advertisement or filtering.
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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