A network technician is troubleshooting a laptop that was moved from an executive office to a newly created conference room VLAN. The laptop cannot access internal resources, and executing `ipconfig /all` displays an IPv4 address of with a subnet mask of . Which of the following statements correctly identify the cause of this issue and the appropriate next diagnostic step? (Select TWO.)
- The host automatically self-assigned an Automatic Private IP Addressing (APIPA) address because it did not receive a lease response from a DHCP server.Answer
- The technician should verify if a DHCP relay agent (IP helper address) is configured on the router interface for the new conference room VLAN.Answer
- CThe laptop assigned itself this IP address due to an incorrect static default gateway configured in the local network adapter settings.
- DThe target subnet is full because usable host capacity was incorrectly calculated without subtracting 2 for network and broadcast addresses.
Answer
The workstation assigned itself an APIPA address because it failed to obtain a DHCP lease, and the network technician should check whether a DHCP relay agent (IP helper address) is configured on the router interface serving the new VLAN.
Addresses in the range are self-assigned APIPA addresses generated by client host operating systems when DHCP discovery fails. When a host is relocated to a new VLAN separated from the central DHCP server, DHCP broadcast requests fail unless a DHCP relay agent (IP helper address) is configured on the default gateway router interface to forward the packets.
Step-by-Step Solution
Key Concept
Diagnosing APIPA address assignment and resolving cross-VLAN DHCP request failures using DHCP relay agents.