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NIOS-DDI-Expert Test Question, Reliable NIOS-DDI-Expert Test Sample

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Infoblox Qualified NIOS DDI Expert - INE Sample Questions (Q50-Q55):

NEW QUESTION # 50
When viewing NTP statistics in NIOS CLI, you notice an entry has the asterisk symbol () next to it. What does the asterisk symbol () signify?

A. It means this NTP server is offline
B. It means this NTP server is unreachable
C. It means the NTP service is disabled for the Member
D. It means the Member is synchronized to this NTP server

Answer: D

Explanation:
Comprehensive and Detailed In-Depth Explanation:NTP (Network Time Protocol) synchronization is critical for Grid operations, and NIOS CLI provides status via show ntp:
* Output Format:Lists NTP servers with symbols:
* *: The server the member is currently synchronized to (stratum and offset shown).
* +: Candidate server (reachable but not primary).
* -: Unreachable or rejected server.
* Asterisk Meaning:Indicates the active sync source, ensuring time consistency across the Grid.
* Options:
* A:Unreachable servers get a "-" or no symbol, not "*". Incorrect.
* B:Matches NTP convention and NIOS behavior-synchronized server. Correct.
* C:Offline servers don't sync and lack "*". Incorrect.
* D:Disabled NTP would prevent stats display, not mark a server. Incorrect.
* Practical Example:In an INE lab, you'd run show ntp, see "*pool.ntp.org," and troubleshoot time drift if the asterisk shifts, testing Grid stability.References:Infoblox NIOS CLI Reference Guide - NTP Commands; INE Course Content: NIOS DDI Grid Troubleshooting.

NEW QUESTION # 51
A firewall change has interrupted the DHCP Failover communication between two DHCP Failover peers.
Both peers are still online and can communicate to clients, but the state is now COMMUNICATIONSINTERRUPTED. What should the administrator do?

A. Nothing
B. Place the secondary peer into PARTNER-DOWN
C. Place the Primary peer into PARTNER-DOWN
D. Change split value

Answer: B

Explanation:
Comprehensive and Detailed In-Depth Explanation:DHCP Failover peers sync leases via TCP 647. A firewall blocking this shifts the state to COMMUNICATIONS-INTERRUPTED:
* State Impact:
* Both peers serve existing clients and limited new leases (via MCLT).
* No sync occurs, risking lease conflicts if prolonged.
* Best Action:Manually set one peer toPARTNER-DOWN(Grid > DHCP > Failover > Edit), giving the other full pool control to avoid conflicts.
* Why Secondary:Conventionally, the secondary is set to PARTNER-DOWN, letting the primary take over as the authoritative peer (per Infoblox best practices).
* Options:
* A:Doing nothing risks conflicts if new leases exceed MCLT capacity. Incorrect long-term.
* B:Primary to PARTNER-DOWN cedes control to secondary, less standard. Incorrect.
* C:Secondary to PARTNER-DOWN empowers primary, aligning with failover design. Correct.
* D:Changing split value doesn't address sync loss. Incorrect.
* Practical Example:In an INE lab, you'd simulate this, set secondary to PARTNER-DOWN, and troubleshoot lease consistency post-firewall fix.References:Infoblox NIOS Administrator Guide - DHCP Failover States; INE Course Content: NIOS DDI DHCP Troubleshooting.

NEW QUESTION # 52
By default, how do peers in an Infoblox DHCP Failover association operate in NORMAL mode?

A. The primary answers all lease requests
B. Whichever peer receives the request first will answer the request
C. The primary answers all lease requests up to the utilization threshold, then the secondary answers requests
D. The primary peer answers roughly half of the lease requests and the secondary answers the other half

Answer: D

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 # 53
What baud rate does the Serial Console use?

A. 39400 bps
B. 57600 bps
C. 9600 bps
D. 2400 bps

Answer: C

Explanation:
Comprehensive and Detailed In-Depth Explanation:The serial console on Infoblox appliances provides low-level access for diagnostics:
* Default Settings:Per NIOS documentation, the serial port operates at9600 baud, with 8 data bits, no parity, 1 stop bit (8N1). This is an industry-standard rate for serial terminals, balancing speed and reliability.
* Verification:Connecting via a terminal emulator (e.g., PuTTY, minicom) requires matching 9600 bps- mismatched rates garble output, a common troubleshooting issue.
* Options:
* A (2400):Too slow, used in older systems, not Infoblox. Incorrect.
* B (9600):Matches NIOS spec. Correct.
* C (39400):Non-standard, likely a typo (38400 is common elsewhere, but not here). Incorrect.
* D (57600):Faster rate for modern devices, not Infoblox default. Incorrect.
* Practical Example:In an INE lab, you'd set PuTTY to 9600 bps, connect via null modem cable, and view boot logs, troubleshooting a Grid member's startup.References:Infoblox NIOS Administrator Guide - Serial Console; INE Course Content: NIOS DDI Grid Troubleshooting.

NEW QUESTION # 54
What configuration can a Grid Master be? (Select all that apply.)

A. A Grid Candidate Failover node
B. A single appliance
C. A High Availability pair
D. A virtual appliance

Answer: B,C,D

Explanation:
Comprehensive and Detailed In-Depth Explanation:The Grid Master (GM) manages the NIOS Grid's database and coordination. Its possible configurations are:
* A (Virtual Appliance):A GM can be a vNIOS instance (e.g., on VMware), fully supported for virtualized deployments. Correct.
* B (Single Appliance):A standalone physical NIOS appliance (e.g., IB-4000) can serve as GM.
Common in smaller Grids. Correct.
* C (High Availability Pair):A GM can be an HA pair (two appliances sharing a VIP), ensuring redundancy. Correct.
* D (Grid Candidate Failover Node):Misnomer-Grid Master Candidate (GMC) is a separate role, not the GM itself. A GMC can be promoted to GM, but it's not a GM configuration. Incorrect.
* Setup:Configured via Grid Manager (Grid > Grid Properties).
* Practical Example:In an INE lab, you'd deploy a vNIOS GM, test HA failover, and troubleshoot sync, exploring deployment options.References:Infoblox NIOS Administrator Guide - Grid Master Setup; INE Course Objective: NIOS DDI Grid Deployment.

NEW QUESTION # 55
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