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Question

Difficulty: MediumIP Addressing Services

A network technician is deploying a new fleet of VoIP desktop phones across multiple subnets. To automate initial provisioning, each phone must automatically receive the IP address or hostname of its TFTP boot server from the central DHCP server upon starting up. Which DHCP option should the technician configure within the DHCP scope to supply this provisioning server information?

  1. Option 66Answer
  2. B
    Option 82
  3. C
    Option 6
  4. D
    Option 42

Answer

Option 66 is used in DHCP scope configurations to specify the TFTP server hostname or IP address required by booting clients like VoIP phones and PXE-enabled computers.
DHCP Option 66 is explicitly designated in core networking standards to provide the TFTP server name or IP address to DHCP clients. This allows unconfigured network devices, such as VoIP phones or PXE boot workstations, to automatically contact their boot server and download operating configurations.

Step-by-Step Solution

1
Identify the service requirement from the scenario.
The devices need automated TFTP provisioning server information delivered via DHCP.
VoIP phones require a boot server address during IP lease acquisition to download firmware and configuration files.
2
Map the requirement to standard DHCP option codes.
DHCP Option 66 is defined specifically for TFTP Server Name / IP Address.
Standardized DHCP options allow centralized addressing services to pass vendor-neutral and protocol-specific metadata to client endpoints.

Key Concept

DHCP Options for Automated IP Addressing Services
Estimated Time:1m 0s
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Topics

IP Addressing Services

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