Cisco 400-051 Exam

Refer to the exhibit. The exhibit shows the Cisco IOS CLI output of debug ipdhcp packet, which was captured on a router that is located at a branch office where a single IP phone is located. There is a standalone Cisco Unified Communications Manager server at the central site, which also provides DHCP services to the IP phone at the branch office. You are troubleshooting a problem where the IP phone received an IP address in the correct subnet and with a correct subnet mask from the DHCP server, but never completed registration with Cisco Unified CM. Assuming the IP phone is correctly defined on Unified CM, which two statements the network components are true? (Choose two.)

  • A. The MAC address of the IP phone is 01ec44761e3e7d.
  • B. The IP address of the DHCP server is
  • C. The MAC address of the VLAN 101 interface is 01ec44761e3e7d.
  • D. The MAC address of the IP phone is ec44761e3e7d.
  • E. There is no IP connectivity between the VLAN 101 interface of the branch router and the ip-helper address that is configured on this interface.
  • F. Based on the information provided, we cannot conclude if there is IP connectivity between the IP phone and Cisco Unified CM.
Answer: Option D. F.

In the logs the only information that we get is about the mac address of the IP phone because the IP phone is raising the boot request.

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