How does PIM source-specific multicast (PIM-SSM) differ from PIM sparse mode (PIM-SM) in terms of tree construction?

PIM-SSM uses bidirectional trees, while PIM-SM uses unidirectional trees

PIM-SSM builds a shortest-path tree directly from the source, while PIM-SM initially builds a shared tree

PIM-SSM requires an RP, while PIM-SM does not

PIM-SSM uses a shared tree, while PIM-SM uses a shortest-path tree

A service provider is migrating a large ASM multicast deployment to SSM. The migration must be incremental, and the provider cannot afford downtime. The existing receivers use IGMPv2, but the provider plans to upgrade them to IGMPv3 over time. During the transition, both ASM and SSM groups must be supported. What is the most effective migration strategy?

Disable ASM and force all receivers to upgrade immediately

Keep ASM groups in 224.0.0.0/4 and introduce SSM groups in 232.0.0.0/8, upgrading receivers as they are ready

Move all groups to 232.0.0.0/8 and upgrade all receivers to IGMPv3 at once

Configure a single RP for both ASM and SSM groups

In the Any-Source Multicast (ASM) model, what is the primary function of the Rendezvous Point (RP)?

To serve as the root of the shared tree and receive initial registration messages from sources

To forward multicast traffic directly from each source to all receivers using shortest-path trees only

To translate multicast group addresses into unicast addresses for routing

To filter multicast traffic based on source addresses before it reaches receivers

A service provider is planning to migrate from ASM to SSM. The provider has a large number of legacy receivers that use IGMPv2 and cannot be upgraded for several months. The provider wants to start using SSM for new services immediately. What is the best approach?

Migrate all services to SSM immediately and upgrade all receivers at once

Deploy SSM for new services in 232.0.0.0/8 and keep ASM for legacy services in 224.0.0.0/4

Use a single RP for both ASM and SSM groups

Disable ASM and force all receivers to upgrade to IGMPv3

A campus network is migrating a video streaming service to SSM. The access switches currently run IGMPv2. The multicast receivers are standard desktop PCs. What must be configured on the access layer to support SSM joins?

Configure a static RP on the access switches

Disable IGMP snooping on the access switches

Enable IGMPv3 on the access switch interfaces facing the receivers

Enable IGMPv2 with source filtering on the access switches

Juniper NetworksCertified Professional, Service Provider Routing and Switching (JNCIP-SP)

Domain 5Objective 2

ASM vs. SSM JN0-664 Practice Questions (Page 1)

Part of the IP Multicast domain, which makes up ~18% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~6–11 in this domain), expect 1–1 from this objective — we provide 25 practice questions to prepare you well beyond it. (estimate)

25questions here

5free pages

7concepts

Questions 1–5

1foundation · easy
How does PIM source-specific multicast (PIM-SSM) differ from PIM sparse mode (PIM-SM) in terms of tree construction?
Select an answer first
2expert · hard
A service provider is migrating a large ASM multicast deployment to SSM. The migration must be incremental, and the provider cannot afford downtime. The existing receivers use IGMPv2, but the provider plans to upgrade them to IGMPv3 over time. During the transition, both ASM and SSM groups must be supported. What is the most effective migration strategy?
Select an answer first
3foundation · easy
In the Any-Source Multicast (ASM) model, what is the primary function of the Rendezvous Point (RP)?
Select an answer first
4expert · hard
A service provider is planning to migrate from ASM to SSM. The provider has a large number of legacy receivers that use IGMPv2 and cannot be upgraded for several months. The provider wants to start using SSM for new services immediately. What is the best approach?
Select an answer first
5application · medium
A campus network is migrating a video streaming service to SSM. The access switches currently run IGMPv2. The multicast receivers are standard desktop PCs. What must be configured on the access layer to support SSM joins?
Select an answer first

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