350-501 · Question #356
350-501 Question #356: Real Exam Question with Answer & Explanation
The correct answer is A: On CPE-1: interface GigabitEthernet0/1 ip address 10.0.12.129 255.255.255.128 ip pim sparse-. The engineer must configure CPE-1 with a lower IP address (10.0.12.129) than CPE-2 to ensure it becomes the preferred IGMP querier, and both routers must use IGMPv2 to support only (*, G) joins on the LAN segment.
Question
Refer to the exhibit. A network engineer is implementing multicast services on CPE-1 and CPE-2. CPE-1 must be configured as the preferred IGMP querier for the LAN segment. PIM-SM must be implemented on the LAN interfaces with an IGMP version that supports (*, G) joins only. Which configurations must the engineer implement on CPE-1 and CPE- 2?
Options
- AOn CPE-1: interface GigabitEthernet0/1 ip address 10.0.12.129 255.255.255.128 ip pim sparse-
- BOn CPE-1: interface GigabitEthernet0/1 ip address 10.0.12.130 255.255.255.128 ip pim sparse-
- COn CPE-1: interface GigabitEthernet0/1 ip address 10.0.12.130 255.255.255.128 ip pim sparse-
- DOn CPE-1: interface GigabitEthernet0/1 ip address 10.0.12.129 255.255.255.128 ip pim sparse-
Explanation
The engineer must configure CPE-1 with a lower IP address (10.0.12.129) than CPE-2 to ensure it becomes the preferred IGMP querier, and both routers must use IGMPv2 to support only (*, G) joins on the LAN segment.
Common mistakes.
- B. CPE-1 is assigned a higher IP address (10.0.12.130) than CPE-2, meaning CPE-2 would be the preferred querier, and IGMPv3 supports both (,G) and (S,G) joins, violating the '(,G) joins only' requirement.
- C. CPE-1 is assigned a higher IP address (10.0.12.130) than CPE-2, meaning CPE-2 would be the preferred querier.
- D. IGMPv3 is configured, which supports (S, G) joins in addition to (, G) joins, violating the requirement to support '(, G) joins only'.
Concept tested. IGMP querier election and PIM-SM configuration
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