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Difficulty: MediumCisco DNA Center Enabled Device Management

A network administrator is deploying unconfigured Cisco Catalyst switches at a new enterprise site using Cisco DNA Center Plug and Play (PnP) for automated onboarding. What infrastructure service must be available on the local staging VLAN so the factory-default switches can locate the Cisco DNA Center controller?

  1. A DHCP server configured to supply an IP address along with DHCP Option 43 or a domain name for DNS resolution of the controller hostnameAnswer
  2. B
    A DHCP relay agent configured on switch ports using the ip helper-address command pointing directly to the Cisco DNA Center REST API port
  3. C
    An active LLDP session with Cisco DNA Center that authenticates the new hardware through TACACS+ protocol exchanges
  4. D
    A local HTTP web server issuing an automated REST PUT request to inject the startup configuration into the switch memory

Answer

A DHCP server configured to supply an IP address along with DHCP Option 43 or a domain name for DNS resolution of the controller hostname
In Cisco DNA Center Network Plug and Play (PnP) zero-touch deployment, factory-default switches initiate contact with the controller using information provided during initial IP acquisition. The local DHCP server must provide an IP configuration and pass the controller's IPv4 address via DHCP Option 43, or supply a domain name allowing the switch to perform a DNS lookup for 'pnpserver.<domain_name>'.

Step-by-Step Solution

1
Identify the Day-0 Plug and Play (PnP) discovery mechanisms for unconfigured Cisco switches.
Unconfigured switches boot up and automatically invoke the PnP agent on their default management interface.
The PnP agent requires an initial network identity (IP address) and controller location parameters to start the onboarding workflow.
2
Evaluate how the switch learns the Cisco DNA Center IP address or hostname dynamically.
The switch issues a DHCP request. The DHCP server responds with an IP lease and includes either DHCP Option 43 (which embeds the controller IP) or a domain name so the switch can resolve 'pnpserver.<localdomain>'.
DHCP Option 43 and DNS resolution are the standard local network mechanisms for PnP controller discovery.

Key Concept

Cisco DNA Center Plug and Play (PnP) Auto-Discovery Mechanisms
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Topics

Cisco DNA Center Enabled Device Management

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