The answer is that the prefix 192.168.1.0/24 has a community attribute of 100:200, which may affect routing decisions. This output from the show bgp ipv4 unicast command confirms that the community value 100:200 is attached to the route, acting as a tag that can influence policy-based actions such as local preference manipulation, route filtering, or redistribution control. In the context of the Cisco CCNP ENARSI 300-410 exam, BGP community attribute troubleshooting often tests your ability to read show command output and recognize how communities like 100:200 are used for route tagging and enforcement, rather than being a direct path selection metric. A common trap is confusing the community value with the AS_PATH or assuming it automatically alters the best path selection—remember that communities only affect routing if a matching policy is applied. Memory tip: Think of communities as “route stickers” that do nothing until a router’s policy reads them.
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.
A network engineer runs the following command to troubleshoot a BGP Troubleshooting issue:
R1# show bgp ipv4 unicast 192.168.1.0/24
BGP routing table entry for 192.168.1.0/24, version 12
Paths: (1 available, best #1, table default)
Advertised to update-groups:
1
Refresh Epoch 1
65001, (received & used)
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The prefix 192.168.1.0/24 has a community attribute of 100:200, which may affect routing decisions.
The show bgp output for a specific prefix shows one path with community 100:200 attached. The community is a BGP community value that can be used for route tagging and policy enforcement. The path is valid and best.
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.
✓
The prefix 192.168.1.0/24 has a community attribute of 100:200, which may affect routing decisions.
Why this is correct
The community 100:200 is shown in the output and can be used for policy.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The prefix 192.168.1.0/24 is not installed in the routing table.
Why it's wrong here
The 'best' status indicates it is installed.
✗
The prefix 192.168.1.0/24 is being filtered due to the community value.
Why it's wrong here
The prefix is shown as valid and best, so it is not filtered.
✗
The community 100:200 indicates the prefix is from a confederation.
Why it's wrong here
Community values are arbitrary; 100:200 does not inherently indicate confederation.
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.
Trap categories for this question
Command / output trap
The prefix is shown as valid and best, so it is not filtered.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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.
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: The prefix 192.168.1.0/24 has a community attribute of 100:200, which may affect routing decisions. — The show bgp output for a specific prefix shows one path with community 100:200 attached. The community is a BGP community value that can be used for route tagging and policy enforcement. The path is valid and best.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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