The answer is that Router R3 has received a total of 350 prefixes from its BGP neighbors. This is determined by summing the values in the State/PfxRcd column for each neighbor, which shows 150 prefixes from 192.168.1.1 and 200 from 192.168.1.2, indicating both sessions are in an established state. The BGP summary output is a critical tool for verifying neighbor relationships and tracking prefix counts, and on the ENCOR 350-401 exam, you must distinguish between the State column (showing neighbor state codes like Idle, Active, or Established) and the PfxRcd column, which directly reports the number of prefixes received. A common trap is misreading the State/PfxRcd header—when a neighbor is established, this column shows a number, not a state code. For a quick memory tip, remember that “PfxRcd” equals “Prefixes Received,” and you simply add them up to get the total BGP table size from all neighbors.
350-401 WAN Technologies Practice Question
This 350-401 practice question tests your understanding of wan technologies. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 issues the following command on Router R3:
R3# show ip bgp summary
BGP router identifier 10.0.0.3, local AS number 65003
BGP table version is 12345, main routing table version 12345
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Router R3 has received a total of 350 prefixes from its BGP neighbors.
The BGP summary shows two neighbors, both in established state with prefixes received. The number of prefixes received (150 and 200) indicates the BGP table size.
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 BGP neighbors are in the 'Idle' state.
Why it's wrong here
The State/PfxRcd column shows numbers (150, 200), which means the session is established and prefixes are received.
✓
Router R3 has received a total of 350 prefixes from its BGP neighbors.
The presence of 150 prefixes indicates the session is up.
✗
Router R3 is in AS 65001.
Why it's wrong here
The local AS number is 65003, not 65001.
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/PfxRcd column shows numbers (150, 200), which means the session is established and prefixes are received.
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 350-401 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 350-401 OSPF questions on adjacency and route selection.
WAN Technologies — This question tests WAN Technologies — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Router R3 has received a total of 350 prefixes from its BGP neighbors. — The BGP summary shows two neighbors, both in established state with prefixes received. The number of prefixes received (150 and 200) indicates the BGP table size.
What should I do if I get this 350-401 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 350-401 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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