300-435 Question 139
Select 2A network administrator is tasked with deploying multiple new Cisco Catalyst switches across remote branch offices. To streamline the process and ensure consistency, the administrator decides to use Zero-Touch Provisioning (ZTP). However, during the ZTP process, the switches fail to retrieve their configuration from the TFTP server. Which of the following could be the likely cause of the issue?
- A
The DHCP server is not providing the correct option 66 or 67.
- B
The TFTP server is inaccessible due to a firewall blocking traffic.
- C
The switches do not have a valid software image pre-installed.
- D
The ZTP process is not supported on the Catalyst switch model in use.
- E
The DNS server is incorrectly resolving the hostname of the TFTP server.
Show answer and explanation
Correct answers: A, B
Explanation
Zero-Touch Provisioning (ZTP) automates the configuration process for new devices by enabling them to retrieve configurations and scripts via TFTP, typically with information provided by a DHCP server. If the DHCP server fails to provide the correct TFTP server information (e.g., option 66), or if network issues such as a firewall block access to the TFTP server, the ZTP process will fail. Other factors like DNS resolution or pre-installed software images are not directly related to the ZTP process.
- A. Correct.
Correct. During ZTP, the DHCP server must provide the TFTP server address (option 66) and optionally the bootfile name (option 67). If these are misconfigured, the switch cannot retrieve its configuration.
- B. Correct.
Correct. If the TFTP server is blocked by a firewall, the switch will fail to connect and download the configuration file.
- C. Incorrect.
Incorrect. ZTP does not require a pre-installed software image; it focuses on automating the provisioning process by downloading the configurations and scripts required.
- D. Incorrect.
Incorrect. ZTP is supported on most modern Cisco Catalyst switches, and this is unlikely to be the root cause unless explicitly noted in the hardware documentation.
- E. Incorrect.
Incorrect. ZTP typically relies on the IP address of the TFTP server provided via DHCP, not DNS resolution. DNS misconfiguration is not relevant in this scenario.