JNCIP-ENT IP Multicast Practice Question
An enterprise engineer is configuring Multicast Source Discovery Protocol (MSDP) on a Junos device. Which THREE statements accurately describe MSDP behavior and functions? (Choose three)
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
✓
MSDP uses Source-Active (SA) messages to advertise active multicast sources to peer RPs.
MSDP is used between RPs to share active sources, uses TCP for transport, and uses SA (Source-Active) messages.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
MSDP uses Source-Active (SA) messages to advertise active multicast sources to peer RPs.
Why this is correct
SA messages contain the source IP, group IP, and originating RP address.
- ✓
MSDP is required for Anycast RP deployments within the same or different PIM domains.
Why this is correct
MSDP synchronizes state between Anycast RPs so receivers registered to one RP learn about sources at the other.
- ✗
MSDP replaces PIM sparse-mode for forwarding multicast data traffic to receivers.
Why it's wrong here
MSDP only shares control plane source information; PIM handles the actual data tree forwarding.
- ✓
MSDP peer connections are maintained via reliable TCP sessions.
Why this is correct
MSDP uses TCP connections to ensure reliable exchange of SA messages.
- ✗
MSDP runs directly over IP protocol number 46.
Why it's wrong here
MSDP runs over TCP (port 639), not raw IP.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Juniper Networks exam blueprint
This JNCIP-ENT practice question is part of Courseiva's free Juniper Networks 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 JNCIP-ENT exam.