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MCSA 70-270 XP Exam Prep

Category - MCSA 70-270 XP

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You are on a routine business visit to one of your branch offices in India. You start your laptop, connect the network cable, and login. You open Microsoft Internet Explorer and receive a “Page cannot be displayed” error for any website you try to open. Upon checking the IP address, you notice that it is 169.254.0.3 with a subnet mask of 255.255.0.0. Which of the following best describes why your laptop has 169.255.0.3 as the IP address?
  1. TCP/IP is not installed on your laptop computer.
  2. NIC is faulty.
  3. Network cable is faulty.
  4. DHCP is not able to provide a valid IP address, hence an APIPA is assigned.
Explanation
Answer: D - A 169.255.X.X series IP address is an APIPA IP address. This is assigned only when a valid IP address cannot be obtained from the DHCP server.

Key Takeaway: APIPA is a DHCP failover mechanism that assigns an IP address to a host when DHCP servers are nonfunctional. APIPA exists in all popular versions of Windows except Windows NT. The APIPA range is from 169.254.0.1 to 169.254.255.254. In APIPA, all devices use the default network mask 255.255.0.0 and all 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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