hardMultiple Choice
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show bgp ipv4 unicast 10.4.4.0/24
BGP routing table entry for 10.4.4.0/24, version 8 Paths: (1 available, best #1, table default) Not advertised to any peer Refresh Epoch 1 65006
10.1.16.6 from 10.1.16.6 (10.6.6.6)
Origin IGP, metric 0, localpref 100, valid, external, best rx pathid: 0, tx pathid: 0x0
Based on this output, what is the most likely reason the route is not advertised to any peer?
⚠ Common exam trap
The trap here is assuming that a route marked 'best' and 'valid' is automatically advertised — candidates forget that outbound policy is evaluated separately and can silently suppress a perfectly valid best path.
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
✓
There is an outbound route-map or prefix-list filtering the route.
The 'Not advertised to any peer' line in the BGP table entry indicates that R1 is not sending this prefix to any of its BGP neighbors, even though the route is valid and marked as best. Since the session is up (the route was received from 10.1.16.6) and the route is in the BGP table, the most likely cause is an outbound filter — a route-map, prefix-list, or distribute-list applied in the outbound direction on the neighbor statement — that is suppressing advertisement. Local preference of 100 is the default and has no bearing on whether a route is advertised.
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 has a local preference of 100, which is too low.
Why it's wrong here
Local preference 100 is the default value and does not suppress advertisement; it only influences outbound path selection within the AS. The 'Not advertised to any peer' line reflects outbound filtering or missing neighbour advertisement configuration, not the local preference attribute.
- ✓
There is an outbound route-map or prefix-list filtering the route.
Why this is correct
The entry shows valid, external, best with no filter flags, so the route exists in the BGP table but is withheld from all peers. An outbound route-map or prefix-list applied to the neighbour suppresses advertisement, which the Not advertised to any peer line confirms.
- ✗
The BGP session to the neighbor is down.
Why it's wrong here
A down session would remove the received path from the BGP table, yet the output shows a valid, best external path from 10.1.16.6. The 'Not advertised to any peer' line concerns outbound advertisement, so the inbound session is clearly established.
- ✗
The route is not in the routing table.
Why it's wrong here
The output shows the path marked valid and best, and BGP installs best paths into the routing table; absence from the RIB would not itself stop advertisement. Outbound filtering or missing neighbour activation explains the 'Not advertised to any peer' line.
Go deeper
Related to this question
Learn chapter
EIGRP Route Summarization and Filtering
Key term
BGP Prefix Filtering
BGP Prefix Filtering is the practice of controlling which network routes (prefixes) a router accepts or advertises to its BGP neighbors, preventing unwanted or harmful routes from spreading across the internet.
Key term
ACL for Routing Protocols
An ACL for Routing Protocols is a set of rules used to filter routing updates between routers, controlling which network routes are advertised or accepted to improve security and stability.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.