350-501 Question #290: Real Exam Question with Answer & Explanation

Question

A network architect decides to expand the scope of the multicast deployment within the company network. The network is already using PIM-SM with a static RP that supports a high-bandwidth, video-based training application that is heavily used by the employees, but excessive bandwidth usage is a concern. How must the engineer update the network to provide a more efficient multicast implementation?

Options

• AConfigure IGMP to manage the multicast hosts on each LAN
• BImplement BSR to support dynamic RP notification.
• CDeploy ICMP to Improve multicast reachability across the network using static RP.
• DImplement STP to improve switching performance for multicast data.

Explanation

To enhance multicast efficiency and mitigate excessive bandwidth usage with PIM-SM, the engineer must configure IGMP on each LAN to manage multicast host memberships, ensuring traffic is sent only to interested receivers.

Common mistakes.

• B. BSR (Bootstrap Router) provides dynamic RP discovery for PIM-SM, but it does not address the issue of inefficient multicast delivery to hosts within a LAN segment; the question specifies using a static RP already.
• C. ICMP (Internet Control Message Protocol) is used for network diagnostics and error reporting, not for managing multicast reachability or improving the efficiency of multicast data delivery.
• D. STP (Spanning Tree Protocol) is a Layer 2 protocol designed to prevent loops in switched networks and does not directly improve the efficiency of multicast data delivery to end hosts.

Concept tested. Multicast efficiency and IGMP role

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti/configuration/15-mt/imc-15-mt-book/imc-igmp.html

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