350-501 Question #608: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. The network is configured with OSPF. A networking team just connected a streaming multicast server to router R7, and they now must enable access for users throughout the network to stream video from the server. Which action must the team take so that users can stream video without overloading the network?

Options

• AImplement PIM-DM on the link between the server and R7.
• BImplement PIM-SM on the LAN network connecting R5, R6, R3, and R4.
• CImplement PIM-SM on all routers and connected links.
• DImplement PIM-DM on all interfaces in the network except the LAN connection between R5, R6,

Explanation

To enable network-wide access for video streaming from a multicast server without overloading the network, PIM-SM (Protocol Independent Multicast-Sparse Mode) must be implemented on all routers and connected links.

Common mistakes.

• A. PIM-DM (Dense Mode) uses a flood-and-prune mechanism, which can be inefficient and overload the network, especially if implemented only on a single link, it does not provide network-wide streaming.
• B. While PIM-SM is efficient, implementing it only on a specific LAN segment is insufficient for enabling network-wide access to the streaming server.
• D. Implementing PIM-DM widely is not recommended for networks with potentially sparse receivers or high-bandwidth streams because its flood-and-prune behavior can lead to network congestion and inefficiency.

Concept tested. PIM Sparse Mode for efficient multicast distribution

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

No community discussion yet for this question.