- A
EIGRP will advertise the 192.168.0.0/22 summary route out of GigabitEthernet0/0 and create a discard route.
Correct. The summary-address command creates a summary route and a corresponding discard route.
- B
EIGRP will only accept routes within the 192.168.0.0/22 range on this interface.
Why wrong: Incorrect. This command is for advertising, not filtering incoming routes.
- C
The summary route will have a metric equal to the best metric among the component routes.
Why wrong: Incorrect. The metric is derived from the component routes, but it is not necessarily the best metric; it is typically the best metric of the component routes, but the statement is not precise enough. The correct answer is A.
- D
This command will cause EIGRP to automatically summarize routes to their classful boundaries.
Why wrong: Incorrect. Automatic summarization is disabled by default in EIGRP for IPv4. This command is manual summarization.
Quick Answer
The correct answer is that EIGRP will advertise the 192.168.0.0/22 summary route out of GigabitEthernet0/0 and create a discard route. This happens because the `ip summary-address eigrp` command triggers EIGRP to suppress more specific component routes and instead advertise only the configured summary prefix, while simultaneously installing a route to null0 to prevent routing loops if the summary is advertised but some of its component subnets are missing from the routing table. On the ENCOR 350-401 exam, this question tests your understanding of EIGRP route summarization behavior, often appearing in a multiple-choice format where a common trap is assuming the command only affects advertisements without creating the discard route. Remember that the null0 route is automatically generated by the summary-address command to ensure loop-free forwarding. A helpful memory tip: “Summarize and nullify” — the summary address command both summarizes the route and nullifies the loop risk.
CCNP EIGRP Practice Question
This 350-401 practice question tests your understanding of eigrp. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Examine the following EIGRP configuration for route summarization:
interface GigabitEthernet0/0 ip summary-address eigrp 100 192.168.0.0 255.255.252.0
What is the effect of this command?
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
EIGRP will advertise the 192.168.0.0/22 summary route out of GigabitEthernet0/0 and create a discard route.
Option A is correct because the `ip summary-address eigrp` command creates a summary route (192.168.0.0/22) that EIGRP advertises out of the specified interface, and it automatically installs a discard (null0) route to prevent routing loops when the summary is advertised but some component routes may not be present in the routing table.
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.
- ✓
EIGRP will advertise the 192.168.0.0/22 summary route out of GigabitEthernet0/0 and create a discard route.
Why this is correct
Correct. The summary-address command creates a summary route and a corresponding discard route.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
EIGRP will only accept routes within the 192.168.0.0/22 range on this interface.
Why it's wrong here
Incorrect. This command is for advertising, not filtering incoming routes.
- ✗
The summary route will have a metric equal to the best metric among the component routes.
Why it's wrong here
Incorrect. The metric is derived from the component routes, but it is not necessarily the best metric; it is typically the best metric of the component routes, but the statement is not precise enough. The correct answer is A.
- ✗
This command will cause EIGRP to automatically summarize routes to their classful boundaries.
Why it's wrong here
Incorrect. Automatic summarization is disabled by default in EIGRP for IPv4. This command is manual summarization.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that `ip summary-address eigrp` filters incoming routes or that it sets the summary metric to the highest metric, when in fact it creates a discard route and uses the minimum metric from component routes.
Trap categories for this question
Command / output trap
Incorrect. This command is for advertising, not filtering incoming routes.
Detailed technical explanation
How to think about this question
When EIGRP creates a summary route, it installs a route to Null0 with an administrative distance of 5 to prevent black-holing and routing loops if the summary is advertised but a more specific route is lost. The metric of the summary is derived from the best metric among the component routes, ensuring the summary is attractive to downstream neighbors. In real-world scenarios, this is critical for reducing routing table size in large enterprise networks.
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 practitioner preparing for the 350-401 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
EIGRP — study guide chapter
Learn the concepts, then practise the questions
- →
EIGRP practice questions
Targeted practice on this topic area only
- →
All 350-401 questions
2,015 questions across all exam domains
- →
ENCOR 350-401 study guide
Full concept coverage aligned to exam objectives
- →
350-401 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 350-401 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Architecture practice questions
Practise 350-401 questions linked to Architecture.
Enterprise Network Design practice questions
Practise 350-401 questions linked to Enterprise Network Design.
SD-Access Architecture practice questions
Practise 350-401 questions linked to SD-Access Architecture.
SD-WAN Architecture practice questions
Practise 350-401 questions linked to SD-WAN Architecture.
QoS Architecture practice questions
Practise 350-401 questions linked to QoS Architecture.
Virtualization practice questions
Practise 350-401 questions linked to Virtualization.
Network Function Virtualization practice questions
Practise 350-401 questions linked to Network Function Virtualization.
Virtual Machines and Hypervisors practice questions
Practise 350-401 questions linked to Virtual Machines and Hypervisors.
VRF and Path Isolation practice questions
Practise 350-401 questions linked to VRF and Path Isolation.
Infrastructure practice questions
Practise 350-401 questions linked to Infrastructure.
OSPF practice questions
Practise 350-401 questions linked to OSPF.
BGP practice questions
Practise 350-401 questions linked to BGP.
Practice this exam
Start a free 350-401 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this 350-401 question test?
EIGRP — This question tests EIGRP — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: EIGRP will advertise the 192.168.0.0/22 summary route out of GigabitEthernet0/0 and create a discard route. — Option A is correct because the `ip summary-address eigrp` command creates a summary route (192.168.0.0/22) that EIGRP advertises out of the specified interface, and it automatically installs a discard (null0) route to prevent routing loops when the summary is advertised but some component routes may not be present in the routing table.
What should I do if I get this 350-401 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
This 350-401 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 350-401 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.