Pass the Infoblox DDI Professional NIOS-DDI-Expert Questions and answers with ExamsMirror

Comprehensive and Detailed In-Depth Explanation:The "Revert" feature in NIOS is a safety mechanism for software upgrades, allowing rollback to the prior version if issues arise. Here’s how it works:

Mechanism:NIOS retains the previous software version and configuration database after an upgrade. The "Revert" option (Grid > Upgrade > Revert) swaps back to the old code, preserving the current DNS zones, DHCP leases, and Grid settings (e.g., member roles).

Conditions:

Revert is available only if the upgrade was successful and the prior version is still stored (not overwritten by multiple upgrades).

Configuration changes made post-upgrade are kept, unlike a factory reset.

Why True:This aligns with Infoblox’s design to minimize downtime and data loss during version management, a key focus in INE’s Grid troubleshooting labs.

Counterpoint:If the database schema changes significantly between versions, some settings might not fully revert, but core DNS/DHCP/Grid data remains intact per documentation.

Practical Example:After upgrading to NIOS 8.6.2 and encountering DNS issues, you’d revert to 8.6.1 in an INE lab, verifying that zone data persists for troubleshooting continuity.References:Infoblox NIOS Administrator Guide – Software Revert; INE Course Content: NIOS DDI Grid Troubleshooting.

Comprehensive and Detailed In-Depth Explanation:Infoblox physical appliances (e.g., IB-1400 series) feature an LCD panel for basic configuration, but its role in Grid joining is limited:

LCD Capabilities:The panel allows setting IP addresses, hostnames, and basic network parameters (e.g., via arrow keys and menu options). It’s useful for initial setup or recovery.

Grid Joining Process:Joining a node to a Grid requires:

Configuring the node’s IP and Grid Master IP.

Authenticating with Grid credentials (e.g., shared secret).

Initiating the join via Grid Manager (Grid > Members > Add) or CLI (set membership).

Why False:The LCD can set preliminary network settings, but full Grid joining—specifying the Grid Master, VPN details, and completing sync—requires CLI or GUI access. The panel lacks the interface for these steps.

Practical Example:In an INE lab, you’d use the LCD to set an IP on a new node, then SSH to run set membership and join the Grid, troubleshooting connectivity via logs.References:Infoblox NIOS Administrator Guide – LCD Panel; INE Course Content: NIOS DDI Grid Deployment.

Comprehensive and Detailed In-Depth Explanation:VRRP is the protocol Infoblox uses for HA:

D:Virtual Router Redundancy Protocol(RFC 3768) provides IP redundancy by sharing a virtual IP (VIP) between routers (or NIOS nodes). Correct.

A/B/C:Fictional acronyms—VRRP is a well-defined standard. Incorrect.

Practical Example:In an INE lab, you’d configure VRRP for an HA pair, test failover, and troubleshoot VRRP packets, reinforcing HA concepts.References:RFC 3768 – VRRP; Infoblox NIOS Administrator Guide – HA; INE Course Content: NIOS DDI Grid Deployment.

Comprehensive and Detailed In-Depth Explanation:Copying DNS records in NIOS (Data Management > DNS > Zones):

Process:Select source zone, choose records, copy to target zone.

B:Copy all of one type (e.g., A records) via filter. Correct.

C:Select multiple types (e.g., A and PTR) using multi-select. Correct.

D:Individually pick records (e.g., “host1 A”) via checkboxes. Correct.

A:“All records” isn’t an option—copying requires specificity (type or selection). Incorrect.

Practical Example:In an INE lab, copy A and PTR records from “lab.com” to “test.com,” test resolution, and troubleshoot mismatches.References:Infoblox NIOS Administrator Guide – DNS Record Management; INE Course Content: NIOS DDI DNS Troubleshooting.

Comprehensive and Detailed In-Depth Explanation:DHCPv4 Failover requirements:

C:TCP 647 is the failover sync port—must be open for lease coordination. Correct.

D:Relays must send requests to both peers (e.g., via IP helper addresses) for load balancing/redundancy. Correct.

A:Crossover cables aren’t required—standard network connectivity suffices. Incorrect.

B:Same subnet isn’t mandatory—peers can be remote if routable. Incorrect.

Practical Example:In an INE lab, ensure port 647 is open, configure relays, test failover, and troubleshoot sync issues.References:Infoblox NIOS Administrator Guide – DHCP Failover Setup; INE Course Content: NIOS DDI DHCP Troubleshooting.

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.

Comprehensive and Detailed In-Depth Explanation:Generating a support bundle for diagnostics:

B:CLI command set support bundle (space, not underscore) generates and downloads a bundle (.tar.gz) with logs, configs, etc. Correct with typo adjustment.

A:Backup is separate (Grid > Backup)—no bundle extraction. Incorrect.

C:GUI offers download (Grid > Grid Manager > Toolbar > Download Support Bundle), but question specifies action—CLI fits phone context. Partially correct but not best.

D:Support assists but doesn’t generate—user action required. Incorrect.

Practical Example:In an INE lab, run set support bundle, transfer it via SCP, and troubleshoot with support.References:Infoblox NIOS CLI Reference Guide – Support Bundle; INE Course Content: NIOS DDI Grid Troubleshooting.

Comprehensive and Detailed In-Depth Explanation:NIOS supports two CSV export formats in Grid Manager (Data Management > Export):

Infoblox CSV Import Format:Structured specifically for NIOS, with headers matching import fields (e.g., "fqdn,ip_address,mac_address"). Includes all necessary metadata for reimporting, making it ideal for editing (e.g., in Excel) and reuploading via the Data Import Wizard (DIW).

Standard CSV (Visible) Format:A human-readable format showing only visible Grid Manager data, lacking the full structure for reimport. It’s better for reporting or external analysis, not manipulation/reimport.

Why A:The Infoblox format ensures compatibility with NIOS’s import process, preserving object relationships and mandatory fields (e.g., marked with *). Editing and reimporting in this format maintains data integrity.

Option Analysis:

B:Standard format isn’t designed for reimport—missing fields cause import failures. Incorrect.

C:They serve different purposes; only Infoblox format suits reimporting. Incorrect.

D:Infoblox format is suitable, so this is false. Incorrect.

Practical Example:In an INE lab, you’d export DNS records in Infoblox CSV format, update IPs, and reimport to test bulk management, a Grid deployment skill.References:Infoblox NIOS Administrator Guide – CSV Export/Import; INE Course Objective: NIOS DDI Grid Deployment.

Comprehensive and Detailed In-Depth Explanation:Grid Manager Toolbar (Grid > Members) offers member controls:

A (Reboot):Reboots the appliance—full restart. Correct.

B (Restart):Restarts services (e.g., DNS, DHCP) without reboot. Correct.

C (Suspend):Pauses services—useful for maintenance. Correct.

D:“Restart GUI” isn’t a member-level option—GUI runs on GM, not per member. Incorrect.

Practical Example:In an INE lab, reboot a member, restart services, suspend another, and troubleshoot impacts.References:Infoblox NIOS Administrator Guide – Member Controls; INE Course Content: NIOS DDI Grid Troubleshooting.

Comprehensive and Detailed In-Depth Explanation: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.References:Infoblox NIOS Administrator Guide – Recycle Bin; INE Course Content: NIOS DDI DNS Troubleshooting.