Comprehensive and Detailed In-Depth Explanation:Grid Master (GM) failure recovery:
B:A Grid Master Candidate (GMC), pre-designated in Grid Manager (Grid > Members), can be promoted (Grid > Promote GMC) to replace a failed GM, assuming its role. Correct.
A:Grid Manager is the UI, not a device. Incorrect.
C:Not all members are GMCs—only designated ones qualify. Incorrect.
D:No “standby GM” role—GMC is the term. Incorrect.
Practical Example:In an INE lab, promote a GMC after GM failure, test sync, and troubleshoot promotion issues.References:Infoblox NIOS Administrator Guide – Grid Master Promotion; INE Course Content: NIOS DDI Grid Troubleshooting.
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