Comprehensive and Detailed In-Depth

Accidentally deleting DNS entries (e.g., A records) in NIOS requires a recovery method that minimizes

downtime and complexity. Here’s the analysis:

Recycle Bin Feature: NIOS includes a Recycle Bin (Data Management > DNS > Recycle Bin) that

temporarily stores deleted objects (e.g., zones, records) unless permanently purged or the bin is

disabled. Restoring from here is instantaneous and doesn’t interrupt services.

Options:

A: Restoring from a backup (Grid > Grid Manager > Backup > Restore) replaces the entire database,

requiring service restarts and potentially losing post-backup changes. High disruption. Incorrect.

B: Promoting a Grid Master Candidate (GMC) to Grid Master (GM) shifts control but doesn’t recover

deleted records—it’s for GM failure, not data loss. Irrelevant. Incorrect.

C: Forcing HA failover on the GM switches active/passive nodes but doesn’t restore data, as both

share the same database. No effect. Incorrect.

D: Restoring from the Recycle Bin (select records > Restore) reverts the deletion with no service

impact, assuming the bin is enabled (default in NIOS). Correct.

Practical Example: In an INE lab, you’d delete an A record, navigate to the Recycle Bin, restore it, and

verify DNS resolution—all without downtime, testing troubleshooting skills.

Caveat: If the Recycle Bin is disabled or entries are purged, backup restoration (A) becomes

necessary, but the question implies least disruption, favoring D.

Reference: Infoblox NIOS Administrator Guide – Recycle Bin; INE Course Content: NIOS DDI DNS

Troubleshooting.