- A
The router will send IGMP membership reports for group 239.1.1.1 out of this interface.
Why wrong: Incorrect. The static-group command makes the router act as a receiver on that interface; it does not send reports out.
- B
The router will include this interface in the outgoing interface list for group 239.1.1.1, even without any IGMP hosts.
Correct. The static-group command adds the interface to the OIL (outgoing interface list) for the group, simulating a receiver.
- C
The router will drop all multicast traffic for group 239.1.1.1 on this interface.
Why wrong: Incorrect. The command adds the interface to the group, so traffic is forwarded, not dropped.
- D
The router will create a static multicast route for 239.1.1.1 via this interface.
Why wrong: Incorrect. This command does not create a route; it only affects IGMP group membership.
Quick Answer
The correct answer is that the router will include this interface in the outgoing interface list for group 239.1.1.1, even without any IGMP hosts. This happens because the ip igmp static-group command artificially simulates a local IGMP membership on the interface, causing the router to add it to the multicast forwarding table’s outgoing interface list (OIL) for that group. On the ENCOR 350-401 exam, this concept tests your understanding of how multicast forwarding decisions are made independently of actual host requests—a common trap is confusing this command with igmp join-group, which only affects the router’s ability to receive traffic locally. Remember that static-group is purely for forwarding: it tricks the router into thinking a downstream host exists, making it ideal for lab testing or ensuring traffic reaches a segment without active members. A helpful memory tip is “static-group sends traffic out; join-group brings traffic in.”
CCNP IP Multicast Practice Question
This 350-401 practice question tests your understanding of ip multicast. 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.
Consider the following configuration on a Cisco IOS-XE router:
ip multicast-routing
!
interface GigabitEthernet0/0 ip address 10.0.0.1 255.255.255.0 ip pim sparse-mode ip igmp static-group 239.1.1.1
!
What is the effect of the 'ip igmp static-group 239.1.1.1' 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
The router will include this interface in the outgoing interface list for group 239.1.1.1, even without any IGMP hosts.
The 'ip igmp static-group' command statically adds the interface to the multicast group 239.1.1.1, meaning the router will treat the interface as if a host has joined that group. This can be used for testing or to ensure multicast traffic is forwarded to that interface even without an active IGMP member.
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.
- ✗
The router will send IGMP membership reports for group 239.1.1.1 out of this interface.
Why it's wrong here
Incorrect. The static-group command makes the router act as a receiver on that interface; it does not send reports out.
- ✓
The router will include this interface in the outgoing interface list for group 239.1.1.1, even without any IGMP hosts.
Why this is correct
Correct. The static-group command adds the interface to the OIL (outgoing interface list) for the group, simulating a receiver.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The router will drop all multicast traffic for group 239.1.1.1 on this interface.
Why it's wrong here
Incorrect. The command adds the interface to the group, so traffic is forwarded, not dropped.
- ✗
The router will create a static multicast route for 239.1.1.1 via this interface.
Why it's wrong here
Incorrect. This command does not create a route; it only affects IGMP group membership.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Incorrect. The static-group command makes the router act as a receiver on that interface; it does not send reports out.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 350-401 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
- →
IP Multicast — study guide chapter
Learn the concepts, then practise the questions
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IP Multicast practice questions
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FAQ
Questions learners often ask
What does this 350-401 question test?
IP Multicast — This question tests IP Multicast — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The router will include this interface in the outgoing interface list for group 239.1.1.1, even without any IGMP hosts. — The 'ip igmp static-group' command statically adds the interface to the multicast group 239.1.1.1, meaning the router will treat the interface as if a host has joined that group. This can be used for testing or to ensure multicast traffic is forwarded to that interface even without an active IGMP member.
What should I do if I get this 350-401 question wrong?
Identify which 350-401 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 18, 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.
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