Question 190
At the Riverbrook research organization, an IPTV VLAN floods a high bitrate multicast stream to offices that have no interested receivers. Which explanation best accounts for the concern?
Explanation
Correct Answer
The situation shows that without learned receiver groups a Layer 2 multicast stream may be flooded to unrelated ports, rather than merely a monitoring or presentation issue. Remediation is to configure supported IGMP snooping and membership handling for the multicast VLAN. This result addresses the stated challenge at the Riverbrook research organization.
Incorrect Answers
The option states: IGMP local group membership does not automatically create routed multicast forwarding across VLANs. By contrast, the current situation is governed by: without learned receiver groups a Layer 2 multicast stream may be flooded to unrelated ports, rather than merely a monitoring or presentation issue. Choosing this alternative would leave the question’s specific root-cause explanation unresolved.
Layer 2 VLAN existence does not by itself supply a routed gateway interface. This option is based on the following distinct technical behavior: layer 2 VLAN existence does not by itself supply a routed gateway interface; a passing acceptance check would show that a test host reaches the SVI address and permitted off subnet destinations. The present question instead depends on this mechanism: without learned receiver groups a Layer 2 multicast stream may be flooded to unrelated ports, rather than merely a monitoring or presentation issue. That difference matters for the requested root-cause explanation.
Mismatched optic characteristics prevent a valid light path despite correct switch configuration. In this question, the decisive issue is: without learned receiver groups a Layer 2 multicast stream may be flooded to unrelated ports, rather than merely a monitoring or presentation issue. That is why the offered option is not the most direct root-cause explanation.