350-501 · Question #333
350-501 Question #333: Real Exam Question with Answer & Explanation
The correct answer is C: Configure the new switches to use IGMPv3 on VLAN10 only.. To ensure correct multicast traffic switching in a network with mixed IGMP versions, the best practice is to align devices to the highest common IGMP version where possible. Configuring the new IGMPv2 switches to run IGMPv3 on the affected VLAN (VLAN10) will ensure seamless inter
Question
A company is expanding its existing office space to a new floor of the building, and the networking team is installing a new set of switches. The new switches are running IGMPv2, and the engineers configured them for VLAN10 only. The rest of the existing network includes numerous Layer 2 switches in multiple other VLANs, all running IGMPv3. Which additional task must the team perform when deploying the new switches so that traffic is switched correctly through the entire network?
Options
- AConfigure the new switches to use IGMPv3 on all VLANs on the network.
- BConfigure all switches on the network to support IGMPv2 and IGMPv3 on all VLANs on the
- CConfigure the new switches to use IGMPv3 on VLAN10 only.
- DConfigure all switches on the network to support IGMPv2 and IGMPv3 on VLAN10 only.
Explanation
To ensure correct multicast traffic switching in a network with mixed IGMP versions, the best practice is to align devices to the highest common IGMP version where possible. Configuring the new IGMPv2 switches to run IGMPv3 on the affected VLAN (VLAN10) will ensure seamless interoperability with the existing IGMPv3 network.
Common mistakes.
- A. Configuring new switches for "all VLANs on the network" is excessive, as they are explicitly mentioned to be configured for VLAN10 only and may not be responsible for other VLANs.
- B. This option suggests a network-wide configuration of both IGMPv2 and IGMPv3 support on all VLANs. While IGMPv3 is backward compatible, explicitly configuring all switches for dual-mode on all VLANs is unnecessarily broad and inefficient when the issue is localized to VLAN10 and new switches.
- D. While limiting the scope to VLAN10 is better than "all VLANs", explicitly configuring all switches for dual IGMPv2/v3 support is less optimal than simply upgrading the new switches to IGMPv3 where it's needed, especially since existing switches already run IGMPv3.
Concept tested. IGMPv2 and IGMPv3 interoperability
Reference. https://www.cisco.com/c/en/us/td/docs/ios/ipmulti/configuration/guide/imc_igmp.html
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