Cisco
352-001 · Question #291
352-001 Question #291: Real Exam Question with Answer & Explanation
The correct answer is A: Enable IGMP snooping querier on both switches.. When no multicast router is present on a VLAN, enabling IGMP snooping querier on the switches allows them to send IGMP queries so hosts can register group memberships, enabling proper multicast traffic optimization.
Question
Refer to the exhibit. Assume that no multicast optimization is done on LAN switches A and B. Which feature can be used to optimize multicast traffic forwarding in this situation?
Exhibit
Options
- AEnable IGMP snooping querier on both switches.
- BConfigure a static MAC entry for the multicast server.
- CDisable IGMP snooping on both switches.
- DDisable the IGMP query election process.
- EEnable PIM Snooping on both switches.
Explanation
When no multicast router is present on a VLAN, enabling IGMP snooping querier on the switches allows them to send IGMP queries so hosts can register group memberships, enabling proper multicast traffic optimization.
Common mistakes.
- B. A static MAC entry for the multicast server does not track which ports have interested receivers and therefore does not optimize multicast forwarding.
- C. Disabling IGMP snooping causes the switch to flood multicast traffic to all ports, which is the opposite of optimization.
- D. Disabling the IGMP query election process prevents queries from being sent, causing membership tables to expire and resulting in multicast flooding.
- E. PIM Snooping optimizes PIM protocol traffic between multicast routers, not multicast data forwarding to end hosts on a LAN.
Concept tested. IGMP snooping querier for LAN multicast optimization
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