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Exam 350-501 topic 1 question 180 discussion

Actual exam question from Cisco's 350-501

Question #: 180
Topic #: 1

A network operator needs to implement PIM-SSM multicast configuration on a 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.)

A. Enable IGMP version 3 at the interface level.
B. Enable PIM dense mode on the device.
C. Enable PIM sparse mode on the device.
D. Enable IGMP version 2 at the interface level.
E. Configure at least one MSDP peer on the network.

Show Suggested Answer

Suggested Answer: AC 🗳️

by jacaWAH at Dec. 12, 2021, 9:48 p.m.

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Highly Voted 3 years, 1 month ago

Selected Answer: AC

A and C are the correct answers. SSM is suitable for use when there are well-known sources either within the local PIM domain or within another PIM domain. The MSDP, which is needed for interdomain multicast routing when regular PIM-SM is used within a domain, is no longer needed for SSM. ^ This is as per Cisco

upvoted 8 times

chst

2 years, 7 months ago

it's correct AC https://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/Phase_2/mcst_p2.html#wp1186721

upvoted 1 times

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Abbribas

Most Recent 10 months, 3 weeks ago

Selected Answer: AC

A. Enable IGMP version 3 at the interface level. IGMPv3 is required for PIM-SSM because it supports source-specific multicast, allowing receivers to specify the exact source from which they want to receive multicast traffic. C. Enable PIM sparse mode on the device. PIM-SSM operates in sparse mode. Sparse mode is necessary for controlling multicast traffic efficiently in a network where receivers explicitly request streams from specific sources.

upvoted 1 times

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TonBud

1 year ago

Selected Answer: AC

igmp v3 and pim ...

upvoted 1 times

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Worgen44

2 years ago

Selected Answer: AC

The correct answers for 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

upvoted 1 times

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xChdjdufurpew

2 years, 1 month ago

there is no need to manage MSDP for SSM between PIM domains

upvoted 1 times

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Samarjit1983

2 years, 4 months ago

An SSM-configured network has distinct 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

upvoted 1 times

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chst

3 years, 1 month ago

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

upvoted 1 times

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ijangulashvili

3 years, 2 months ago

Selected Answer: AC

In SSM we dont 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

upvoted 2 times

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jacaWAH

3 years, 6 months ago

not AC?

upvoted 2 times

EdgardoAC

3 years, 6 months ago

Enabling PIM-Sparse mode is required to use SSM, however the question also states that the users are in different domains, so MSDP is used to connect multiple PIM-SSM domains.

upvoted 1 times

ijangulashvili

3 years, 2 months ago

but why do we need MSDP is SSM? there are no RP, RP mappings and so on. I think AC is the correct answer

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