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Infoblox Qualified NIOS DDI Expert - INE Sample Questions (Q22-Q27):

NEW QUESTION # 22
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 relays are configured to relay to DHCP members simultaneously
B. TCP port 647 is open between DHCP members
C. DHCP members are located in the same subnet
D. DHCP members are directly connected via crossover network cables

Answer: A,B

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 # 23
VRRP is used for Infoblox High Availability. VRRP requires a virtual IP address, a virtual router ID, a virtual MAC address, and a VRRP priority. The administrator configures which values? (Select all that apply.)

A. VRRP priority
B. Virtual IP address
C. Virtual router ID
D. Virtual MAC address

Answer: A,B,C

Explanation:
Comprehensive and Detailed In-Depth Explanation:Virtual Router Redundancy Protocol (VRRP) is the mechanism Infoblox uses for HA pairs, ensuring seamless failover between active and passive nodes by sharing a virtual IP (VIP). Let's analyze what the administrator configures:
* A (Virtual MAC Address):VRRP automatically generates the virtual MAC address based on the Virtual Router ID (VRID) using the format 00:00:5E:00:01:XX, where XX is the VRID in hexadecimal. The admin doesn't manually set this-it's derived. Incorrect.
* B (Virtual IP Address):The VIP is the shared IP that clients use to reach the HA pair. The administrator must configure this in the HA setup (e.g., 192.168.1.100) to define the service endpoint.
Correct.
* C (Virtual Router ID):The VRID (1-255) uniquely identifies the VRRP group on the network. The admin sets this to avoid conflicts with other VRRP instances. Correct.
* D (VRRP Priority):The priority (0-255) determines which node is active (higher priority wins). The admin configures this (e.g., 100 for active, 90 for passive) to control failover behavior. Correct.
* Practical Example:In an INE lab, you'd configure a VIP (e.g., 10.0.0.10), VRID (e.g., 25), and priorities (e.g., 100/90) to set up an HA pair, then troubleshoot failover using VRRP logs.References:
Infoblox NIOS Administrator Guide - HA Configuration with VRRP; INE Course Content: NIOS DDI Grid Deployment.

NEW QUESTION # 24
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 both nodes
C. Reset everything before trying to re-join
D. Use traffic capture on the first node (the active node)

Answer: A,B

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 # 25
Which system provides database synchronization to the passive node of an HA pair Grid Member?

A. The DNS Primary
B. The Grid Master
C. The Grid Master Candidate
D. The Active Node of the HA pair

Answer: D

Explanation:
Comprehensive and Detailed In-Depth Explanation:In an Infoblox High Availability (HA) pair, the active node maintains the live database and services (DNS, DHCP, etc.), while the passive node remains on standby, ready to take over if needed. Database synchronization between the active and passive nodes is handled directly by the active node using thebloxSyncmechanism over a secure connection (typically SSL). The Grid Master oversees Grid-wide synchronization, but within an HA pair, the active node is responsible for keeping the passive node's database up-to-date. The Grid Master Candidate (GMC) and DNS Primary are unrelated to this specific HA pair sync process. This is a key troubleshooting point in the INE course.References:Infoblox NIOS Documentation - HA Configuration; INE Course Content: NIOS DDI Grid Troubleshooting.

NEW QUESTION # 26
Any serial cable will work to connect to the serial port of an Infoblox appliance.

A. True
B. False

Answer: B

Explanation:
Comprehensive and Detailed In-Depth Explanation:Connecting to an Infoblox appliance's serial port for CLI access requires specific hardware compatibility, not just any serial cable. Here's why:
* Serial Port Specs:Infoblox appliances use a standard DB9 serial port with a default baud rate of 9600 bps, 8 data bits, no parity, 1 stop bit (8N1). The cable must match this configuration and the appliance's pinout (typically RS-232 standard).
* Cable Types:
* Astraight-through serial cablewon't work-it's for connecting dissimilar devices (e.g., DTE to DCE).
* Anull modem cable(with crossed transmit/receive pins) is required to connect a computer (DTE) to the appliance (DTE), ensuring proper signal flow.
* Practical Issue:Using an incompatible cable (e.g., lacking null modem crossover or incorrect connectors like RJ45) results in no communication, a common troubleshooting pitfall.
* INE Context:The course's troubleshooting labs emphasize correct serial access for diagnosing network- down scenarios, highlighting this specificity.
* Why False:Not all serial cables are null modem cables, and connector compatibility (e.g., DB9 vs.
USB adapters) matters. Thus, "any serial cable" is incorrect.
* Example:In an INE lab, you'd use a DB9 null modem cable with a terminal emulator (e.g., PuTTY) set to 9600 bps to access CLI logs after a Grid member failure.References:Infoblox NIOS Administrator Guide - Serial Console Access; INE Course Content: NIOS DDI Grid Troubleshooting.

NEW QUESTION # 27
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