300-430 · Question #280
300-430 Question #280: Real Exam Question with Answer & Explanation
The correct answer is D: Place the primary CMX IP address and the secondary CMX IP address in the same subnet.. Cisco CMX Layer 2 HA requires all three IP addresses - primary, secondary, and virtual - to reside on the same subnet. The primary (192.168.1.4/24) and secondary (192.168.4.4/24) are on different subnets, which breaks Layer 2 adjacency required for HA heartbeat communication.
Question
Options
- APlace the primary CMX IP address and the virtual IP address in the same subnet.
- BPlace the secondary CMX IP address and the virtual IP address in different subnets.
- CUse a virtual IP address with CMX Layer 3 high availability.
- DPlace the primary CMX IP address and the secondary CMX IP address in the same subnet.
Explanation
Cisco CMX Layer 2 HA requires all three IP addresses - primary, secondary, and virtual - to reside on the same subnet. The primary (192.168.1.4/24) and secondary (192.168.4.4/24) are on different subnets, which breaks Layer 2 adjacency required for HA heartbeat communication.
Common mistakes.
- A. Placing only the primary and virtual IP in the same subnet still leaves the secondary in a different subnet, which does not satisfy the Layer 2 HA requirement that all three addresses share the same subnet.
- B. The secondary and virtual IP must be in the same subnet for Layer 2 HA to function - placing them in different subnets would further break the configuration, not fix it.
- C. The question specifically asks about Layer 2 HA; switching to Layer 3 HA changes the architecture entirely and does not address the misconfiguration causing the current failover failure.
Concept tested. Cisco CMX Layer 2 high availability subnet requirements
Community Discussion
No community discussion yet for this question.