- A
Neighbor 10.0.1.4 is in the 'Active' state because it received 0 prefixes.
Why wrong: The output shows '0' in the State/PfxRcd column, which indicates the session is established (no state word) but 0 prefixes received. 'Active' would show the word 'Active' instead of a number.
- B
Neighbor 10.0.1.4 has sent 0 prefixes to R1.
Why wrong: The column is 'State/PfxRcd' which means prefixes received, not sent. The number 0 indicates R1 received 0 prefixes from 10.0.1.4.
- C
Neighbor 10.0.1.4 is not advertising any prefixes to R1.
The 0 in the PfxRcd column means R1 has received no prefixes from 10.0.1.4. This is likely because 10.0.1.4 has no routes to advertise or is filtering outbound.
- D
The BGP session with 10.0.1.4 is down.
Why wrong: If the session were down, the state would show 'Idle', 'Active', 'Connect', etc. The presence of a number (0) indicates the session is established.
Quick Answer
The answer is that neighbor 10.0.1.4 is not advertising any prefixes to R1. The PfxRcd column in the show bgp summary output directly indicates the number of prefixes received from each BGP neighbor, and a value of 0 means no routes have been learned from that peer. While the Up/Down timer of 00:05:45 confirms the BGP session is established and the neighbor is reachable, the zero in the PfxRcd column reveals a lack of advertised prefixes, which could be due to missing network statements, route filters, or an empty routing table on the neighbor side. On the ENCOR 350-401 exam, this interpretation tests your ability to quickly diagnose BGP peering health versus prefix exchange—a common trap is confusing a session being “up” with actually receiving routes. A reliable memory tip is to think of PfxRcd as “Prefixes Received,” not “Peer is fine,” so always check that number before assuming a neighbor is contributing to the routing table.
CCNP BGP Practice Question
This 350-401 practice question tests your understanding of bgp. 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 runs the following command on Router R1:
R1# show bgp summary
BGP router identifier 10.0.0.1, local AS number 65001 BGP table version is 14, main routing table version 14 4 network entries using 1152 bytes of memory 4 path entries using 320 bytes of memory 2/1 BGP path/bestpath attribute entries using 560 bytes of memory 0 BGP route reflector client to client reflections 2 BGP community entries using 80 bytes of memory
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.0.1.2 4 65002 2345 2346 14 0 0 00:12:34 3 10.0.1.3 4 65003 1234 1235 14 0 0 00:08:21 2 10.0.1.4 4 65004 567 568 14 0 0 00:05:45 0
Based on this output, what can be concluded?
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
Neighbor 10.0.1.4 is not advertising any prefixes to R1.
The 'State/PfxRcd' column shows the number of prefixes received from each neighbor. Neighbor 10.0.1.4 has a value of 0, meaning it has not advertised any prefixes to R1. The session is established (Up/Down shows 00:05:45), so the neighbor is reachable and the BGP session is up, but it is not sending any prefixes.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Neighbor 10.0.1.4 is in the 'Active' state because it received 0 prefixes.
Why it's wrong here
The output shows '0' in the State/PfxRcd column, which indicates the session is established (no state word) but 0 prefixes received. 'Active' would show the word 'Active' instead of a number.
- ✗
Neighbor 10.0.1.4 has sent 0 prefixes to R1.
Why it's wrong here
The column is 'State/PfxRcd' which means prefixes received, not sent. The number 0 indicates R1 received 0 prefixes from 10.0.1.4.
- ✓
Neighbor 10.0.1.4 is not advertising any prefixes to R1.
Why this is correct
The 0 in the PfxRcd column means R1 has received no prefixes from 10.0.1.4. This is likely because 10.0.1.4 has no routes to advertise or is filtering outbound.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The BGP session with 10.0.1.4 is down.
Why it's wrong here
If the session were down, the state would show 'Idle', 'Active', 'Connect', etc. The presence of a number (0) indicates the session is established.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may misinterpret the '0' in the 'State/PfxRcd' column as a session failure or that R1 is not sending prefixes, when it actually indicates the neighbor is not advertising any prefixes to R1.
Trap categories for this question
Command / output trap
The output shows '0' in the State/PfxRcd column, which indicates the session is established (no state word) but 0 prefixes received. 'Active' would show the word 'Active' instead of a number.
Detailed technical explanation
How to think about this question
The 'show bgp summary' output displays the number of prefixes received from each neighbor in the 'State/PfxRcd' column. A value of 0 can occur if the neighbor has no routes to advertise, if outbound route filters are applied, or if the neighbor's BGP table is empty. In real-world scenarios, this often indicates a misconfiguration on the neighbor side, such as missing network statements or incorrect prefix-list filters.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
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FAQ
Questions learners often ask
What does this 350-401 question test?
BGP — This question tests BGP — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Neighbor 10.0.1.4 is not advertising any prefixes to R1. — The 'State/PfxRcd' column shows the number of prefixes received from each neighbor. Neighbor 10.0.1.4 has a value of 0, meaning it has not advertised any prefixes to R1. The session is established (Up/Down shows 00:05:45), so the neighbor is reachable and the BGP session is up, but it is not sending any prefixes.
What should I do if I get this 350-401 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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