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CompTIA Network+ Exam Review

Category - Networking

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Jack is a network administrator at his organization. Last night he accidentally messed up the connections running to the server. Today all users have been complaining about not having Internet connectivity and IP addresses in the 169.254.xxx.xxx series. What should Jack check first?
  1. DHCP server
  2. DNS server
  3. Client NIC
  4. Internet Explorer
Explanation
Answer - A - Jack should check the DHCP server or configurations. The 169.254 series of IP addresses is an APIPA-an IP address assigned when the computer is not able to obtain an IP address through DHCP.

Key Takeaway: The automatic private IP addressing (or APIPA) feature automatically assigns a 169.254.xxx.xxx address if the system does not obtain an IP address from the DHCP server at boot. When a DHCP server fails, APIPA allocates addresses in the private range (169.254.0.1 to 169.254.255.254). Clients verify their address is unique on the LAN using ARP. When the DHCP server is again able to service requests, clients update their addresses automatically. In APIPA, all devices use the default network mask 255.255.0.0 and reside on the same subnet. APIPA is enabled on all DHCP clients in Windows unless the computer's Registry is modified to disable it. APIPA can be enabled on individual network adapters.
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