Exam 350-501 topic 1 question 154 discussion

Actual exam question from Cisco's 350-501

Question #: 154
Topic #: 1

[All 350-501 Questions]

Refer to the exhibit. If router RA is configured as shown, which IPv4 multicast address space does it use?

A. 224.0.0.0/8
B. 225.0.0.0/8
C. 232.0.0.0/8
D. 239.0.0.0/8

Show Suggested Answer

Suggested Answer: C 🗳️
Reference:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/multicast/configuration_guide/b_mc_3se_3850_cg/ b_mc_3se_3850_cg_chapter_01011.html

by nolbi at Jan. 12, 2021, 10:31 a.m.

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nolbi

Highly Voted 4 years, 4 months ago

Link is broken. https://tools.ietf.org/html/rfc4607

upvoted 5 times

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Abbribas

Most Recent 9 months, 4 weeks ago

Selected Answer: C

SSM can coexist with the ISM service by applying the SSM delivery model to a configured subset of the IP multicast group address range. The Internet Assigned Numbers Authority (IANA) has reserved the address range from 232.0.0.0 through 232.255.255.255 for SSM applications and protocols. The software allows SSM configuration for an arbitrary subset of the IP multicast address range from 224.0.0.0 through 239.255.255.255. When an SSM range is defined, an existing IP multicast receiver application will not receive any traffic when it tries to use addresses in the SSM range unless the application is modified to use explicit (S, G) channel subscription or is SSM-enabled through a URL Rendezvous Directory (URD).

upvoted 1 times

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sushil_bhattacharjee

1 year, 3 months ago

PIM-SSM (PIM Enhancement) PIM SSM enables a client to receive multicast traffic directly from the source using a subset of IGMP version 3 (IGMPv3) and PIM sparse mode. PIM SSM builds the SPT (Shortest Path Tree) between the receiver and the source using the PIM sparse-mode functionality rather than an RP. • Uses the dedicated group range 232.0.0.0/8

upvoted 1 times

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Jondal

2 years, 5 months ago

Quote from RFC > IP version 4 (IPv4) addresses in the 232/8 (232.0.0.0 to 232.255.255.255) range are designated as source-specific multicast (SSM) destination addresses and are reserved for use by source-specific applications and protocols. For IP version 6 (IPv6), the address prefix FF3x::/32 is reserved for source-specific multicast use.

upvoted 2 times

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