- A
A route reflector forwards routes received from a non-client peer to all client and non-client peers.
This is a standard behavior of route reflectors to reduce IBGP peering.
- B
A route reflector appends its own AS number to the AS_PATH when reflecting routes.
Why wrong: Route reflectors do not modify the AS_PATH; they reflect routes transparently.
- C
The cluster ID is used to prevent routing loops within a route reflector cluster.
The cluster ID is added to the cluster-list attribute to detect loops.
- D
Clients in a route reflector cluster must be fully meshed with each other.
Why wrong: Clients only need to peer with the route reflector, not with each other.
- E
A route reflector changes the next-hop attribute to its own address when reflecting routes.
Why wrong: The next-hop is not changed unless explicitly configured with next-hop-self.
300-410 BGP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of bgp troubleshooting. 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.
Which TWO statements about BGP route reflectors are true when troubleshooting route propagation issues? (Choose TWO.)
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
A route reflector forwards routes received from a non-client peer to all client and non-client peers.
Route reflectors pass routes from non-client peers to all other peers (including other clients and non-clients) without requiring full mesh, but they do not modify the AS_PATH. The cluster ID is used to prevent loops within a cluster. Option B is incorrect because route reflectors do not prepend the AS_PATH. Option D is incorrect because clients must peer only with the route reflector, not with each other. Option E is incorrect because the next-hop is not changed by default.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A route reflector forwards routes received from a non-client peer to all client and non-client peers.
- ✗
A route reflector appends its own AS number to the AS_PATH when reflecting routes.
Why it's wrong here
Route reflectors do not modify the AS_PATH; they reflect routes transparently.
- ✓
The cluster ID is used to prevent routing loops within a route reflector cluster.
Why this is correct
The cluster ID is added to the cluster-list attribute to detect loops.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Clients in a route reflector cluster must be fully meshed with each other.
Why it's wrong here
Clients only need to peer with the route reflector, not with each other.
- ✗
A route reflector changes the next-hop attribute to its own address when reflecting routes.
Why it's wrong here
The next-hop is not changed unless explicitly configured with next-hop-self.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 300-410 question test?
BGP Troubleshooting — This question tests BGP Troubleshooting — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: A route reflector forwards routes received from a non-client peer to all client and non-client peers. — Route reflectors pass routes from non-client peers to all other peers (including other clients and non-clients) without requiring full mesh, but they do not modify the AS_PATH. The cluster ID is used to prevent loops within a cluster. Option B is incorrect because route reflectors do not prepend the AS_PATH. Option D is incorrect because clients must peer only with the route reflector, not with each other. Option E is incorrect because the next-hop is not changed by default.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
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