The answer is that Router R1 is advertising exactly two prefixes to its BGP neighbor at 10.0.1.2. This conclusion is drawn directly from the output of the `show bgp ipv4 unicast neighbors 10.0.1.2 advertised-routes` command, which specifically displays only the routes that the local router is sending out to that particular neighbor, not the routes it is receiving. The output confirms that R1 is advertising 172.16.0.0/16 and 172.16.1.0/24, both with a next hop of 10.0.1.1 (R1’s own interface), and the total count of two prefixes is explicitly stated. On the ENCOR 350-401 exam, this command tests your ability to distinguish between `advertised-routes` (outbound) and `received-routes` (inbound), a common trap where candidates confuse which router is the source. A useful memory tip: "Advertised routes are what I tell my neighbor; received routes are what my neighbor tells me."
350-401 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 ipv4 unicast neighbors 10.0.1.2 advertised-routes
Network Next Hop Metric LocPrf Weight Path
*> 172.16.0.0/16 10.0.1.1 0 100 0 i
*> 172.16.1.0/24 10.0.1.1 0 100 0 i
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
R1 is advertising 2 prefixes to neighbor 10.0.1.2.
The command 'show bgp ipv4 unicast neighbors 10.0.1.2 advertised-routes' specifically displays the routes that Router R1 is sending to the BGP neighbor at 10.0.1.2. The output shows two prefixes (172.16.0.0/16 and 172.16.1.0/24) with a next hop of 10.0.1.1 (R1's own interface), confirming these are routes R1 is advertising. Therefore, option B is correct.
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.
✗
R1 is receiving 2 prefixes from neighbor 10.0.1.2.
Why it's wrong here
This command shows advertised routes, not received routes. Received routes are shown with 'received-routes'.
✓
R1 is advertising 2 prefixes to neighbor 10.0.1.2.
Why this is correct
The command explicitly shows routes that R1 advertises to the neighbor. The total is 2 prefixes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Neighbor 10.0.1.2 is advertising these routes to R1.
Why it's wrong here
The output is from R1's perspective, showing what R1 advertises, not what it receives.
✗
The routes are being advertised with a next hop of 10.0.1.2.
Why it's wrong here
The next hop shown is 10.0.1.1, which is R1's own interface IP, not the neighbor's.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 'advertised-routes' and 'received-routes' keywords, trapping candidates who confuse which device is the sender versus receiver in the BGP neighbor relationship.
Trap categories for this question
Command / output trap
This command shows advertised routes, not received routes. Received routes are shown with 'received-routes'.
Detailed technical explanation
How to think about this question
In BGP, the 'advertised-routes' keyword triggers a query to the BGP table for routes that have been installed and sent to the specified neighbor, filtered by outbound policy. The next hop of 10.0.1.1 indicates that R1 is the originator or is advertising these routes with its own interface as the next hop, which is typical for networks directly connected or redistributed into BGP. This command is useful for verifying that outbound route advertisements match intended policy, especially in complex iBGP or eBGP designs.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
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: R1 is advertising 2 prefixes to neighbor 10.0.1.2. — The command 'show bgp ipv4 unicast neighbors 10.0.1.2 advertised-routes' specifically displays the routes that Router R1 is sending to the BGP neighbor at 10.0.1.2. The output shows two prefixes (172.16.0.0/16 and 172.16.1.0/24) with a next hop of 10.0.1.1 (R1's own interface), confirming these are routes R1 is advertising. Therefore, option B is correct.
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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Question Discussion
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