- A
Auto-summary is enabled by default, summarizing classful boundaries.
Why wrong: This was true in older IOS, but not in current IOS-XE.
- B
Auto-summary is disabled by default, so subnets are advertised without summarization.
Correct: In IOS-XE, auto-summary is off by default, preventing unwanted classful summarization.
- C
Auto-summary is enabled only for EIGRP named mode configurations.
Why wrong: Auto-summary behavior is not dependent on EIGRP mode; it is disabled by default in both classic and named modes.
- D
Auto-summary is disabled by default, but only for IPv6 EIGRP.
Why wrong: This applies to both IPv4 and IPv6; auto-summary is IPv4-specific and disabled by default.
Question 2,013 of 2,152
300-410 Device Management Practice Question
This 300-410 practice question tests your understanding of device management. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 statement correctly describes the default behavior of EIGRP auto-summary on Cisco IOS-XE?
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
✓
Auto-summary is disabled by default, so subnets are advertised without summarization.
In Cisco IOS-XE, EIGRP auto-summary is disabled by default. This means that EIGRP advertises subnets without summarizing them to their classful boundaries, preserving the original prefix lengths. This behavior changed from older IOS versions where auto-summary was enabled by default, which could cause routing issues in discontiguous networks.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Auto-summary is enabled by default, summarizing classful boundaries.
Why it's wrong here
This was true in older IOS, but not in current IOS-XE.
- ✓
Auto-summary is disabled by default, so subnets are advertised without summarization.
Why this is correct
Correct: In IOS-XE, auto-summary is off by default, preventing unwanted classful summarization.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Auto-summary is enabled only for EIGRP named mode configurations.
Why it's wrong here
Auto-summary behavior is not dependent on EIGRP mode; it is disabled by default in both classic and named modes.
- ✗
Auto-summary is disabled by default, but only for IPv6 EIGRP.
Why it's wrong here
This applies to both IPv4 and IPv6; auto-summary is IPv4-specific and disabled by default.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the change in default behavior between older IOS and IOS-XE, where candidates may incorrectly assume auto-summary is still enabled by default based on legacy knowledge.
Detailed technical explanation
How to think about this question
Under the hood, EIGRP auto-summary uses the classful network boundaries defined by the IP address's first octet (e.g., 10.0.0.0/8 for Class A). When enabled, EIGRP automatically summarizes routes to their classful prefix when crossing a different major network boundary, which can cause suboptimal routing or black holes in discontiguous networks. In real-world scenarios, disabling auto-summary is critical for modern networks using VLSM or discontiguous subnets to ensure accurate routing.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Management — This question tests Device Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Auto-summary is disabled by default, so subnets are advertised without summarization. — In Cisco IOS-XE, EIGRP auto-summary is disabled by default. This means that EIGRP advertises subnets without summarizing them to their classful boundaries, preserving the original prefix lengths. This behavior changed from older IOS versions where auto-summary was enabled by default, which could cause routing issues in discontiguous networks.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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