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Difficulty: MediumIP Addressing Services

A network engineer is integrating a central IP Address Management (IPAM) system with existing DHCP and DNS infrastructure to automate IP provisioning for newly deployed IP phones. Which TWO of the following actions must be configured on the DHCP service to enable automatic IPAM tracking and direct the phones to their provisioning server?

  1. Define vendor-specific DHCP option codes (such as Option 66 or Option 150) containing the IP address of the TFTP provisioning server.Answer
  2. B
    Configure an IP helper address on host interfaces pointing directly to the IPAM server to forward address leases.
  3. Configure dynamic DNS (DDNS) update credentials and DHCP logging to feed active lease allocation data to the IPAM database.Answer
  4. D
    Create static DNS CNAME records mapping each client phone's MAC address directly to its assigned IPv4 address.
  5. E
    Modify the DHCP service settings to transmit boot configuration payloads over TCP port 67 instead of UDP port 67.

Answer

The correct configurations are defining vendor-specific DHCP option codes (such as Option 66 or Option 150) for provisioning server identification and enabling dynamic DNS updates alongside DHCP lease logging for IPAM synchronization.
Configuring DHCP options such as Option 66 or Option 150 allows DHCP servers to inform IP phones of the IP address or hostname of their provisioning server (such as TFTP). Simultaneously, enabling dynamic DNS (DDNS) integration and lease logging allows the central IPAM platform to ingest lease data continuously, keeping track of assigned IP addresses across subnets.

Step-by-Step Solution

1
Identify the mechanism required to deliver TFTP provisioning server details to IP phones during DHCP negotiation.
Configuring specific DHCP options (Option 66 or Option 150) passes the TFTP server address directly to client phones during address assignment.
VoIP phones rely on standardized DHCP option fields in the DHCPACK payload to discover their boot file server automatically.
2
Identify how IPAM tracks active IP space and DNS mappings dynamically.
Integrating dynamic DNS (DDNS) update mechanisms and leveraging DHCP lease event logging allows the IPAM system to monitor active leases.
IPAM relies on API hooks, syslog/audit logs, or direct DDNS integrations from the DHCP server to maintain an accurate central inventory of active leases.

Key Concept

DHCP Options and IP Address Management Integration
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Topics

IP Addressing Services

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