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 could not register to Cisco Unified Communications Manager. You have confirmed that the IP phone received an IP address in the correct subnet and with a correct subnet mask from the DHCP server. Assuming the IP phone is correctly defined on Unified CM, which two statements about the network components are true? (Choose two.)

  • A. The MAC address of the IP phone is 01ec44761e3e.
  • B. The IP address of the DHCP server is 10.101.15.1.
  • C. The MAC address of the VLAN 101 interface is ec44761e3e7d.
  • D. The IP address of the VLAN 101 interface is 10.101.15.1.
  • E. There is IP connectivity between the VLAN 101 interface of the branch router and the ip-helper address that is configured on this interface.
  • F. There is IP connectivity between the IP phone and the ip-helper address on the VLAN 101 interface.
Answer: Option D. E.
Explanation: 

As we can see from the logs given first line relate that dhcp request is being relayed. So it clarifies there must be ip helper address commend given by the admin on interface vlan 101. Now we can see from the second line that giaddress is set as source address of vlan 101 by the dhcp as 10.101.15.1 to unicast the dhcp request

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