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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.)
Comprehensive and Detailed In-Depth
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.
When defining a Custom Option, what attributes must an administrator provide?
Comprehensive and Detailed In-Depth
Defining a custom DHCP option in NIOS (Data Management > DHCP > Option Spaces):
Required Attributes:
A (Option Name): User-defined label (e.g., ''VoIPConfig''). Mandatory for identification. Correct.
B (Code): Option number (1-254), matching vendor spec (e.g., 66 for TFTP). Mandatory. Correct.
C (Type): Data type (e.g., string, IP), defining format. Mandatory. Correct.
D (Allowed Value(s)): Optional---constrains values (e.g., ''server1''), but not required for definition. Incorrect here.
Practical Example: In an INE lab, you'd define Option 66 (Name: ''TFTP,'' Code: 66, Type: string), apply it, and troubleshoot client uptake.
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.)
Comprehensive and Detailed In-Depth
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.
What configuration can a Grid Master be? (Select all that apply.)
Comprehensive and Detailed In-Depth
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.
Any serial cable will work to connect to the serial port of an Infoblox appliance.
Comprehensive and Detailed In-Depth
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:
A straight-through serial cable won't work---it's for connecting dissimilar devices (e.g., DTE to DCE).
A null 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.
