Question 791 of 2,015

IP Multicast →mediumMatchingObjective-mapped

Quick Answer

The answer is (S,G) Tree for the description "A source-specific tree for source S and group G." This is correct because a Shortest Path Tree (SPT) is built per source, creating a unique distribution path from each sender to all receivers in the multicast group, which minimizes latency at the cost of more state in routers. In contrast, a Rendezvous Point Tree (RPT) uses a shared (*,G) tree rooted at the RP, while a Bidirectional tree allows traffic to flow both toward and away from the RP, making it ideal for many-to-many applications. On the ENCOR 350-401 exam, this drag-and-drop task tests your ability to distinguish between SPT, RPT, and Bidirectional multicast tree types—a common trap is confusing (S,G) with (*,G), so remember that the asterisk means "any source." Memory tip: "S in SPT stands for Source-specific, just like the S in (S,G)."

350-401 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 each multicast tree type on the left to its matching description on the right.

Question 1mediummatching

Study the full multicast explanation →

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

✓

Shortest Path Tree (SPT): A source-specific multicast tree rooted at the source

SPT is a source-specific tree rooted at the source; RPT is a shared tree rooted at the RP; Bidir tree is a shared tree used in Bidir PIM; (*,G) tree is a shared tree for all sources; (S,G) tree is a source-specific tree.

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: Shortest Path Tree (SPT): A source-specific multicast tree rooted at the source — SPT is a source-specific tree rooted at the source; RPT is a shared tree rooted at the RP; Bidir tree is a shared tree used in Bidir PIM; (*,G) tree is a shared tree for all sources; (S,G) tree is a source-specific tree.

What should I do if I get this 350-401 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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Same concept, more angles

1 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 each multicast tree type on the left to its matching description on the right.

medium

✓ P1.SPT (Shortest Path Tree): Tree rooted at the source, uses optimal path to each receiver
✓ P2.RPT (Rendezvous Point Tree): Shared tree rooted at the RP, used in PIM Sparse Mode
✓ P3.Bidirectional Tree: Shared tree that allows multicast traffic to flow in both directions
✓ P4.Source Tree: A tree rooted at the source of the multicast traffic
✓ P5.Shared Tree: A tree rooted at the RP, shared by all sources for a given group

Why P1: SPT is the shortest path from source to receivers; RPT is a shared tree rooted at the RP; Bidirectional tree allows traffic to flow both ways; Source tree is a tree rooted at the source; Shared tree is a tree rooted at the RP.

Last reviewed: Jun 18, 2026

Question Discussion

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