JN0-650: Enterprise Routing and Switching, Professional (JNCIP-ENT)

By Juniper · Question Mode

QuestionQ20

IP Multicast

You are deploying PIM source-specific multicast (SSM) on Junos OS to stream content to receivers using multicast group 239.100.100.100. The default SSM range (232.0.0.0/8) does not contain this group. The receivers use IGMPv3.

Which two configuration tasks must you complete to ensure these receivers successfully subscribe to the SSM stream?

Choose two
Explanation

Junos PIM SSM uses PIM sparse-mode functionality to establish the source-specific (S,G) tree, requiring PIM sparse mode on the relevant router interfaces. Because 239.100.100.100 falls outside the default 232.0.0.0/8 SSM range, it must be added as an additional SSM group under [edit routing-options multicast] with ssm-groups. SSM mapping is for IGMPv1/v2 hosts, whereas IGMPv3 receivers can signal source-specific membership directly.

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