Q39NetworkingMultiple answers
A network operator must implement PIM-SSM multicast configuration in a customer network so users in different domains can access and stream live traffic. Which two actions must the engineer perform on the network for streaming to work? (Choose two.)
Select 2 answers.
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2
not AC?
A, C 2
Selected Answer: AC
In SSM we don't need RP, MSDP, and so on anymore, just Sparse mode and igmpv3
https://www.juniper.net/documentation/us/en/software/junos/multicast/topics/concept/multicast-pim-ssm.html
1
Enabling PIM-Sparse mode is necessary to use SSM, but the question also says the users are in different domains, so MSDP is used to connect multiple PIM-SSM domains.
1
but why do we need MSDP in SSM? there are no RP, RP mappings and so on. I think AC is the correct answer
1
A and D are correct
The SSM network scenario used in this document is based on the hypothetical interdomain ISP network scenario described in the "Interdomain Multicast Solutions Using MSDP" document. Figure 1
https://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/Phase_2/mcst_p2.html
1
An SSM-configured network has clear advantages over a traditionally configured PIM sparse-mode network. There is no need for shared trees or RP mapping (no RP is required), or for RP-to-RP source discovery through MSDP.
https://www.juniper.net/documentation/us/en/software/junos/multicast/topics/concept/multicast-pim-ssm.html
1
there is no need to handle MSDP for SSM between PIM domains
A, C 1
Selected Answer: AC
The correct answers to the question are:
A. Enable IGMP version 3 at the interface level.
C. Enable PIM sparse mode on the device.
MSDP is not needed in PIM-SSM
A, C 1
Selected Answer: AC
ingmp v3 and pim ...
A, C 1
Selected Answer: AC
A. Enable IGMP version 3 at the interface level.
IGMPv3 is required for PIM-SSM because it supports source-specific multicast, which lets receivers specify the exact source they want to receive multicast traffic from.
C. Enable PIM sparse mode on the device.
PIM-SSM runs in sparse mode. Sparse mode is needed to control multicast traffic efficiently in a network where receivers explicitly request streams from specific sources.