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Networking Fundamentals · Intermediate

DHCP Options

Additional configuration parameters a DHCP server sends to clients, identified by number.

Definition

Common options are 1 subnet mask, 3 router (default gateway), 6 DNS servers, 15 domain name, 42 NTP servers, 43 vendor-specific (often WLC addresses for access points), 66 and 67 for TFTP boot server and file, and 150 for Cisco TFTP servers.

Example

Option 150 tells Cisco IP phones where to download their configuration.

Exam tip

Option 3 = gateway, option 6 = DNS.

Related terms