Question 1mediumdrag order
Study the full multicast explanation →Question 808 of 2,015
Quick Answer
The correct order ends with source traffic forwarded to the receiver via the shortest path, because in IGMPv3 Source-Specific Multicast (SSM), the host initiates the process by sending a membership report containing an (S,G) inclusion request, which the querier must then process to update its multicast routing state, ultimately triggering a PIM (S,G) join toward the source to establish the shortest-path tree. This sequence tests your understanding of how SSM differs from ASM by eliminating the shared tree and RP, a key distinction on the ENCOR 350-401 exam where drag-and-drop questions often hide traps like inserting a PIM (*,G) join or a shared-tree step. A common mistake is placing the PIM join before the querier processes the report, so remember the host must speak first. Memory tip: think "Host Reports, Querier Processes, PIM Joins, Traffic Flows" — the four beats of SSM.
CCNP IP Multicast Practice Question
This 350-401 practice question tests your understanding of ip multicast. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Drag and drop the steps of IGMP v3 SSM membership report process into the correct order, from first to last.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
✓
Host sends IGMPv3 membership report with (S,G) include
In IGMPv3 SSM, the host first sends a membership report with (S,G) inclusion, the querier processes it, updates its state, and then triggers PIM (S,G) join toward the source.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
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.
What to study next
Got this wrong? Here's your next step.
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 350-401 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 350-401 question test?
IP Multicast — This question tests IP Multicast — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Host sends IGMPv3 membership report with (S,G) include — In IGMPv3 SSM, the host first sends a membership report with (S,G) inclusion, the querier processes it, updates its state, and then triggers PIM (S,G) join toward the source.
What should I do if I get this 350-401 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 350-401 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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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 →
Same concept, more angles
2 more ways this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop the steps of IGMP v3 SSM membership report process into the correct order, from first to last.
medium- ✓ A.Host sends IGMPv3 Membership Report with (S,G)
- ✓ B.Router receives report and updates IGMP state
- ✓ C.Router creates (S,G) entry in mroute table
- ✓ D.Router sends PIM (S,G) Join toward source
- ✓ E.Source forwards multicast traffic to host
Why A: IGMPv3 SSM membership reports are sent by hosts to request traffic from specific sources. The host first sends a Membership Report listing desired (S,G) pairs. The router processes the report, updates its multicast routing table, and then sends PIM (S,G) Joins toward the source. The source forwards traffic, which is then delivered to the host.
Variation 2. Drag and drop the steps of IGMPv3 membership report processing into the correct order, from first to last.
medium- ✓ A.Host sends IGMPv3 Membership Report with group and sources
- ✓ B.Router receives report and updates group membership
- ✓ C.Router adds (S,G) entries for requested sources
- ✓ D.Router forwards multicast traffic from allowed sources
- ✓ E.Router sends IGMP General Query to refresh membership
Why A: IGMPv3 allows hosts to specify source filtering. The host sends a Membership Report with group and source list. The switch/router receives the report and updates its multicast forwarding table. It adds the group and includes the requested sources. It then forwards multicast traffic from those sources to the host's port. The router periodically sends General Queries to maintain membership.
Keep practising
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Last reviewed: Jun 18, 2026
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