350-501 Networking Practice Question
An ISP is implementing BGP communities to influence routing behavior for their customers. They want to ensure that a customer's routes are not advertised to a specific transit provider. Which BGP community should be used?
⚠ Common exam trap
Cisco often tests the distinction between NO_EXPORT and NO_ADVERTISE, where candidates mistakenly choose NO_ADVERTISE because they think it only blocks eBGP advertisements, but in reality NO_ADVERTISE blocks all advertisements (including iBGP), making NO_EXPORT the correct choice when the goal is to block only external (eBGP) propagation.
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
✓
NO_EXPORT
The NO_EXPORT community (RFC 1997) tells a router to advertise the route to iBGP peers within the same AS but not to any eBGP peers. In this scenario, the ISP wants to prevent a customer's routes from being advertised to a specific transit provider, which is an eBGP neighbor. Applying the NO_EXPORT community to those routes ensures they stay within the ISP's AS and are not sent to any external transit provider.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
LOCAL_AS
Why it's wrong here
LOCAL_AS is not a BGP community; it is a feature for AS-path prepending.
- ✓
NO_EXPORT
Why this is correct
This community ensures the route stays within the local AS and is not sent to any external AS.
- ✗
NO_PEER
Why it's wrong here
There is no standard BGP community named NO_PEER.
- ✗
NO_ADVERTISE
Why it's wrong here
This community prevents advertisement to any BGP peer, including internal peers.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 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 350-501 exam.