350-501 · Question #225
A network operator needs to implement PIM-SSM multicast configuration on customer's network so that users in different domains are able to access and stream live traffic. Which two actions must the…
The correct answer is A. Configure at least one MSDP peer on the network. D. Enable IGMP version 3 at the interlace level. To implement PIM-SSM for inter-domain live streaming, receivers must signal specific source interests using IGMPv3, and active sources in different domains must be discoverable via MSDP.
Question
A network operator needs to implement PIM-SSM multicast configuration on customer's network so that users in different domains are able to access and stream live traffic. Which two actions must the engineer perform on the network to make the streaming work? (Choose two.)
Options
- AConfigure at least one MSDP peer on the network.
- BEnable IGMP version 2 at the interface level.
- CEnable PIH sparse mode on the device.
- DEnable IGMP version 3 at the interlace level.
- EEnable PIM dense mode on the device.
How the community answered
(61 responses)- A44% (27)
- B7% (4)
- C34% (21)
- E15% (9)
Why each option
To implement PIM-SSM for inter-domain live streaming, receivers must signal specific source interests using IGMPv3, and active sources in different domains must be discoverable via MSDP.
MSDP (Multicast Source Discovery Protocol) is essential for inter-domain PIM-SM, including SSM, as it enables Rendezvous Points (RPs) in different multicast domains to discover active sources outside their own domain.
IGMPv2 supports Any-Source Multicast (ASM) but lacks the capability for receivers to specify a source, which is a fundamental requirement for PIM-SSM.
Enabling 'PIM sparse mode' is a prerequisite for SSM, but it is not one of the two specific actions that ensure inter-domain streaming for SSM; IGMPv3 and MSDP are more direct requirements.
PIM-SSM (Source-Specific Multicast) relies on IGMPv3 (Internet Group Management Protocol Version 3) to allow receivers to explicitly signal their interest in receiving multicast traffic from a specific source to a specific group.
PIM dense mode is based on a flood-and-prune mechanism and does not support the explicit source signaling required by PIM-SSM, making it unsuitable for this scenario.
Concept tested: PIM-SSM configuration, IGMPv3, and MSDP
Source: https://www.cisco.com/c/en/us/td/docs/ios/ipmulticast/configuration/guide/imc_cfg/imc_cfg_pim_ssm.html
Topics
Community Discussion
No community discussion yet for this question.