- A
The route 192.168.1.0/24 is accepted and installed in the BGP table because the community is no-export.
Why wrong: The update is explicitly denied due to the no-export community; it is not accepted.
- B
The route 192.168.1.0/24 is denied because of the no-export community, which prevents it from being advertised to any peer.
The no-export community causes the route to be denied from being advertised to any eBGP peer; this debug confirms the denial.
- C
The route 192.168.1.0/24 is denied because of an inbound prefix-list filter.
Why wrong: The debug explicitly states 'community no-export' as the reason, not a prefix-list.
- D
The route 192.168.1.0/24 is accepted but marked with no-export for outbound filtering.
Why wrong: The update is denied inbound; it is not accepted into the BGP table at all.
Quick Answer
The correct interpretation is that the route 192.168.1.0/24 is denied due to the no-export community, which prevents it from being advertised to any eBGP peer. The debug output explicitly shows “DENIED due to: community no-export,” meaning an inbound route policy on the receiving router is filtering the update based on that community value (0xFFFFFF01). While the no-export community normally allows a route to be received and installed locally but blocks its advertisement to external peers, in this context the router is applying an inbound filter that rejects the update outright. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to read BGP debug output and distinguish between standard community behavior and explicit inbound policy denial. A common trap is assuming the no-export community only affects outbound advertisements, but here the router is actively denying the incoming update due to a configured filter. Memory tip: “No-export blocks the export, but a filter can block the import.”
300-410 Device Access Control Practice Question
This 300-410 practice question tests your understanding of device access control. 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 Device Access Control issue:
R1# debug ip bgp updates
BGP(0): 10.1.1.2 rcv UPDATE w/ attr: nexthop 10.1.1.2, origin i, metric 0, path 65002 BGP(0): 10.1.1.2 rcv UPDATE about 192.168.1.0/24 -- DENIED due to: community no-export;
What does this output indicate?
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
The route 192.168.1.0/24 is denied because of the no-export community, which prevents it from being advertised to any peer.
The debug output explicitly states 'DENIED due to: community no-export'. The no-export community (0xFFFFFF01) prevents the route from being advertised to any eBGP peer, but it does not prevent the route from being received or installed in the local BGP table. However, in this context, the router is denying the incoming update because of an inbound policy that matches the no-export community and rejects the route. Option B correctly identifies that the route is denied due to the no-export community, which stops it from being advertised to any peer.
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.
- ✗
The route 192.168.1.0/24 is accepted and installed in the BGP table because the community is no-export.
Why it's wrong here
The update is explicitly denied due to the no-export community; it is not accepted.
- ✓
The route 192.168.1.0/24 is denied because of the no-export community, which prevents it from being advertised to any peer.
Why this is correct
The no-export community causes the route to be denied from being advertised to any eBGP peer; this debug confirms the denial.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The route 192.168.1.0/24 is denied because of an inbound prefix-list filter.
Why it's wrong here
The debug explicitly states 'community no-export' as the reason, not a prefix-list.
- ✗
The route 192.168.1.0/24 is accepted but marked with no-export for outbound filtering.
Why it's wrong here
The update is denied inbound; it is not accepted into the BGP table at all.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between a route being denied due to an inbound filter versus being accepted but then restricted from outbound advertisement; the trap here is assuming that the no-export community only affects outbound behavior, when in fact it can be used in inbound policies to reject routes entirely.
Detailed technical explanation
How to think about this question
The no-export community (well-known, value 0xFFFFFF01) is typically used to prevent a route from being advertised outside a confederation or to eBGP peers. In this scenario, the receiving router has an inbound route-map or neighbor statement that matches the no-export community and denies the route, which is a common practice to filter routes based on community tags. Under the hood, BGP community filtering can be applied inbound or outbound; here, the inbound policy is rejecting the update entirely, so the route is not installed in the BGP table.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Access Control — This question tests Device Access Control — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The route 192.168.1.0/24 is denied because of the no-export community, which prevents it from being advertised to any peer. — The debug output explicitly states 'DENIED due to: community no-export'. The no-export community (0xFFFFFF01) prevents the route from being advertised to any eBGP peer, but it does not prevent the route from being received or installed in the local BGP table. However, in this context, the router is denying the incoming update because of an inbound policy that matches the no-export community and rejects the route. Option B correctly identifies that the route is denied due to the no-export community, which stops it from being advertised to any peer.
What should I do if I get this 300-410 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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