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Infoblox Qualified NIOS DDI Expert - INE Sample Questions (Q76-Q81):
NEW QUESTION # 76
By default, how do peers in an Infoblox DHCP Failover association operate in NORMAL mode?
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:DHCP Failover in NIOS ensures redundancy and load balancing between primary and secondary peers in NORMAL mode:
* Default Behavior:The lease pool is split (typically 50/50 unless customized via "split" settings), and each peer manages its portion. Clients send DHCPDISCOVER broadcasts, and relays (or direct requests) distribute them to both peers. The peers coordinate via TCP 647, ensuring:
* Primary answers from its half.
* Secondary answers from its half.
* Load is roughly balanced (not precisely 50/50 due to relay behavior).
* Options:
* A:Matches the default split-pool design, where peers share the load. Correct.
* B:"First come, first serve" isn't how failover works-peers don't race; they use pool allocation.
Incorrect.
* C:No utilization threshold triggers a switch-both peers serve concurrently from their pools.
Incorrect.
* D:Primary-only answering defeats failover's redundancy and balancing. Incorrect.
* Practical Example:In an INE lab, you'd configure a 50/50 split, simulate client requests, and troubleshoot lease distribution via DHCP logs, verifying NORMAL mode behavior.References:
Infoblox NIOS Administrator Guide - DHCP Failover; INE Course Content: NIOS DDI DHCP Troubleshooting.
NEW QUESTION # 77
If a Grid Master Fails, what can be promoted to take the place of the Grid Master? (Choose one.)
Answer: B
Explanation:
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.
NEW QUESTION # 78
Which action can an administrator safely perform during an upgrade?
Answer: C
Explanation:
Comprehensive and Detailed In-Depth Explanation:During a NIOS software upgrade (Grid > Upgrade), the Grid enters a sensitive state where certain actions risk instability. Let's evaluate:
* Upgrade Phases:Upload, Distribute, Test, Upgrade. Members reboot and sync, requiring database consistency.
* Options:
* A:Updating DNS views modifies the database, which could conflict with the upgrade's database sync or cause service interruptions. Unsafe.
* B:Changing DHCP properties (e.g., ranges) alters live configurations, risking lease sync issues during member reboots. Unsafe.
* C:Setting the time zone (Grid > Members > Edit > Basic) is a non-service-affecting change, stored locally and applied post-reboot. Safe during upgrades, as it doesn't impact DNS/DHCP
/Grid data. Correct.
* D:Incorrect, as C is a viable safe action.
* Practical Example:In an INE lab, you'd adjust a member's time zone during an upgrade to align logs, troubleshooting without disrupting the process.References:Infoblox NIOS Administrator Guide - Upgrade Best Practices; INE Course Content: NIOS DDI Grid Deployment.
NEW QUESTION # 79
From the CLI, the administrator must show the status of the DNS processes every 10 seconds for 1 minute.
Which command should the administrator use?
Answer: B
Explanation:
Comprehensive and Detailed In-Depth Explanation:Monitoring DNS processes via NIOS CLI requires the show process command:
* Goal:Display DNS status every 10 seconds for 60 seconds (6 refreshes).
* Actual Command:NIOS CLI doesn't have a single command with "refresh" and "run for" syntax as listed. Closest is:
* show process dns (displays DNS service status).
* No native auto-refresh exists-admins use external tools (e.g., watch -n 10 "show process dns") or repeat manually.
* Options:
* A:"refresh 10 run for 60" isn't valid syntax. Incorrect.
* B:"refresh 10" isn't supported, but manually running show process dns and repeating (e.g., via script or Enter) is closest. Incorrect syntax but feasible intent.
* C/D:"screen refresh" isn't NIOS CLI-sounds like UNIX screen. Incorrect.
* Workaround:SSH with while true; do show process dns; sleep 10; done and Ctrl+C after 60s.
* Practical Example:In an INE lab, you'd script this to monitor DNS during a failover, troubleshooting service uptime.
References:Infoblox NIOS CLI Reference Guide - Show Commands; INE Course Content: NIOS DDI DNS Troubleshooting.
NEW QUESTION # 80
Which of the following statements about restarting Grid services are true? (Select all that apply.)
Answer: C,D
Explanation:
Comprehensive and Detailed In-Depth Explanation:Restarting services (e.g., DNS, DHCP) on NIOS Grid members is a common administrative task, often required after configuration changes. Let's break down each option with detailed reasoning:
* A:"Poll members to see which services will be restarted" suggests proactively querying members for restart eligibility. NIOS doesn't offer a specific polling feature for this-administrators check service status (e.g., via Grid Manager > Members > Services) or logs, but there's no pre-restart polling tool.
Incorrect.
* B:In Grid Manager (Grid > Grid Manager > Members), you can select a member and click "Restart Services" with a "Force Restart" option, overriding any checks for necessity. This is useful in troubleshooting (e.g., clearing a hung DNS service). Correct.
* C:NIOS allows scheduling service restarts via the "Schedule Restart" option in Grid Manager, letting you specify a time to minimize disruption (e.g., off-hours). This aligns with Grid management best practices taught in INE. Correct.
* D:There's no default daily restart policy in NIOS. Restarts occur only when triggered by an admin or system event (e.g., upgrade). This would disrupt service unnecessarily if true. Incorrect.
* Practical Example:During an INE lab, you might force a restart on a member to resolve a DHCP failover issue or schedule a restart after updating a DNS zone to ensure propagation, reflecting real- world Grid troubleshooting.References:Infoblox NIOS Administrator Guide - Managing Grid Services; INE Course Content: NIOS DDI Grid Troubleshooting.
NEW QUESTION # 81
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