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Infoblox Qualified NIOS DDI Expert - INE Sample Questions (Q13-Q18):

NEW QUESTION # 13
You are asked to configure DHCPv4 failover on the Grid. Which of the following do you need for it to function correctly? (Select all that apply.)

A. DHCP members are located in the same subnet
B. DHCP members are directly connected via crossover network cables
C. TCP port 647 is open between DHCP members
D. DHCP relays are configured to relay to DHCP members simultaneously

Answer: C,D

Explanation:
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.

NEW QUESTION # 14
The Infoblox WAPI/RESTful API requires the administrator to use the Perl programming language.

A. True
B. False

Answer: B

Explanation:
Comprehensive and Detailed In-Depth Explanation:The Infoblox Web API (WAPI) is a RESTful API that allows administrators to interact with the NIOS system programmatically for tasks like managing DNS records, DHCP leases, and Grid configurations. Contrary to requiring Perl, WAPI is language-agnostic-it uses HTTP-based requests (GET, POST, PUT, DELETE) and returns data in JSON format. While Infoblox provides sample scripts in Perl (and historically supported a Perl API), administrators can use any programming language (e.g., Python, Java, or even tools like cURL) that supports HTTP requests. The misconception might stem from older documentation emphasizing Perl examples, but the INE course, focusing on advanced NIOS management, clarifies that WAPI is not tied to Perl.References:Infoblox NIOS Documentation - WAPI Guide; INE Course Objective: NIOS Grid Troubleshooting (covers API usage).

NEW QUESTION # 15
To debug possible database issues on an Infoblox appliance, which file should an administrator review?

A. messages file downloaded via the GUI
B. infoblox.log file in the support bundle
C. messages file in the support bundle
D. infoblox.log file downloaded via the GUI

Answer: B

Explanation:
Comprehensive and Detailed In-Depth Explanation:Debugging database issues (e.g., sync failures, corruption) requires detailed logs specific to NIOS operations. Here's the breakdown:
* A (messages file in support bundle):The "messages" file contains general system logs (e.g., kernel events), not NIOS-specific database activity. It's less relevant here. Incorrect.
* B (infoblox.log via GUI):The GUI allows downloading logs (Grid > Logs > Download), but these are often filtered or summarized, not the raw, comprehensive database logs needed for deep debugging.
Incorrect.
* C (infoblox.log in support bundle):The "infoblox.log" in a support bundle (generated via CLI or GUI:
Grid > Support Bundle) is the primary NIOS application log, capturing detailed database events (e.g., bloxSync errors, transaction failures). This is the go-to file for database troubleshooting, as emphasized in INE labs. Correct.
* D (messages via GUI):Similar to A, this is a general system log, not NIOS-specific, and lacks database granularity. Incorrect.
* Practical Example:In an INE troubleshooting scenario, you'd download a support bundle after a Grid sync failure, extract "infoblox.log," and search for database error codes to diagnose the issue.
References:Infoblox NIOS Administrator Guide - Logging and Support Bundles; INE Course Content:
NIOS DDI Grid Troubleshooting.

NEW QUESTION # 16
By default, how do peers in an Infoblox DHCP Failover association operate in NORMAL mode?

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

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 # 17
A customer reports difficulty joining a standalone High Availability (HA) pair. How should the customer diagnose the issue? Choose 2 answers

A. Use error messages recorded in syslog and debug log on both nodes
B. Use traffic capture on the first node (the active node)
C. Reset everything before trying to re-join
D. Use traffic capture on both nodes

Answer: A,D

Explanation:
Comprehensive and Detailed In-Depth Explanation:Joining a standalone HA pair to a Grid involves network, authentication, and sync issues. Best diagnostics:
* A:Syslog (show log syslog) and debug logs (e.g., infoblox.log in support bundle) on both nodes reveal errors (e.g., "Join failed: invalid secret"). Essential for root cause. Correct.
* C:Traffic capture (tcpdump via CLI) on both nodes checks VRRP, bloxSync, and network issues (e.g., blocked ports). Comprehensive view of communication. Correct.
* B:Capturing only the active node misses passive node issues (e.g., firewall blocking sync). Incomplete.
Incorrect.
* D:Resetting erases logs and configs, hindering diagnosis-last resort, not initial step. Incorrect.
* Practical Example:In an INE lab, you'd check syslog for "sync failed," run tcpdump -i eth0 port 443 on both, and troubleshoot a blocked SSL port.References:Infoblox NIOS Administrator Guide - HA Troubleshooting; INE Course Content: NIOS DDI Grid Troubleshooting.

NEW QUESTION # 18
......

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