350-501 Question #239: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. A network administrator is implementing IGMP to enable multicast feed transmission to the receiver. Which configuration must the administrator deploy on GW1 to permit IGMP Joins only to the assigned (S, G) feed?

Options

• Aconfig t
• Bconfig t
• Cconfig t
• Dconfig t

Explanation

To permit IGMP Joins only to a specific (S, G) feed, the administrator must deploy an IGMP access list on GW1's interface to filter join requests.

Common mistakes.

• A. An incorrect or incomplete configuration for IGMP filtering would fail to properly restrict or permit specific (S,G) joins, leading to unauthorized multicast reception or blocking of legitimate feeds.
• B. A configuration that does not define source-group specific filters or applies them improperly will not achieve the granular control over IGMP joins required for specific (S,G) feeds.
• D. An irrelevant or improperly configured command sequence will not successfully restrict IGMP joins to only the specified (S,G) multicast feed on GW1.

Concept tested. Configuring IGMP access lists for (S, G) filtering

Reference. https://www.cisco.com/c/en/us/td/docs/ios/ipmulti/configuration/guide/imc_igmp_snoop_psg_cg.html

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