This 300-410 practice question tests your understanding of route summarization. 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 Route Summarization issue:
R1# show ip nhrp detail
10.0.0.0/16 via 10.1.1.2, Tunnel0 created 00:01:00, expire 01:59:00
Type: summary, Flags: used
NBMA address: 192.168.1.2
Registration: never
What does this output indicate?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The summary route 10.0.0.0/16 is learned via NHRP and is active, with the next hop being 192.168.1.2 over Tunnel0.
This output shows an NHRP cache entry for the summary route 10.0.0.0/16. The type is 'summary', indicating that this is a summary route learned via NHRP. The 'used' flag and NBMA address show that the route is active and pointing to a specific tunnel destination.
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 summary route 10.0.0.0/16 is learned via NHRP and is active, with the next hop being 192.168.1.2 over Tunnel0.
Why this is correct
The 'summary' type and 'used' flag confirm this is an active NHRP summary route.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The summary route is not being used because the 'used' flag is not set.
Why it's wrong here
The 'used' flag is present.
✗
The summary route is learned via EIGRP, not NHRP.
Why it's wrong here
The output is from 'show ip nhrp detail', indicating NHRP.
✗
The summary route is a static route configured on the router.
Why it's wrong here
NHRP is a dynamic protocol; the type 'summary' indicates it is learned via NHRP summarization.
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 output is from 'show ip nhrp detail', indicating NHRP.
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.
Route Summarization — This question tests Route Summarization — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The summary route 10.0.0.0/16 is learned via NHRP and is active, with the next hop being 192.168.1.2 over Tunnel0. — This output shows an NHRP cache entry for the summary route 10.0.0.0/16. The type is 'summary', indicating that this is a summary route learned via NHRP. The 'used' flag and NBMA address show that the route is active and pointing to a specific tunnel destination.
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: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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