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

By Juniper · Question Mode

QuestionQ57

IP Multicast

You are troubleshooting a multicast deployment in a network. Some multicast groups run in PIM-ASM mode, while others run in PIM-SSM mode. During troubleshooting, you observe the following:

  • The network uses IGMPv2 on some segments and IGMPv3 on others.
  • For group 232.1.1.1, receivers know the multicast sender’s exact source IP.
  • For group 239.10.10.10, receivers do not know the source address beforehand.

Which two statements correctly describe the operational differences between these two modes in Junos OS?

Choose two
Explanation

PIM-ASM supports any-source multicast: receivers can join a group without prior source knowledge, and the RP provides source discovery for one or more active sources. PIM-SSM requires the receiver to identify both the source and group, normally through IGMPv3; the receiver’s designated router sends an (S,G) join toward the source and does not use the RP.

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