100-140 Question 214
Single answerA user reports that they are unable to connect to the internet. You suspect an IP configuration issue and use the 'ipconfig' command on their Windows machine. Which output from 'ipconfig' would indicate the most likely cause of the issue?
- A
The IPv4 address is 169.254.x.x
- B
The default gateway is 192.168.1.1
- C
The subnet mask is 255.255.255.0
- D
The DNS server is 8.8.8.8
Show answer and explanation
Correct answer: A
Explanation
When a system cannot obtain a valid IP address from a DHCP server, it automatically assigns itself an APIPA address in the 169.254.x.x range, which does not allow internet connectivity. Recognizing this address in the 'ipconfig' output helps identify the cause of the issue and indicates that the DHCP server may be unreachable or misconfigured.
- A. Correct.
An IPv4 address in the range 169.254.x.x is an APIPA (Automatic Private IP Addressing) address, indicating the system could not obtain a valid IP address from a DHCP server, which is likely the cause of the connectivity issue.
- B. Incorrect.
A default gateway of 192.168.1.1 is a common configuration for home or small office networks and is likely correct, so it does not indicate an issue.
- C. Incorrect.
A subnet mask of 255.255.255.0 is a standard configuration for many local networks and is unlikely to be the cause of the problem.
- D. Incorrect.
A DNS server of 8.8.8.8 is a valid public DNS server provided by Google and would not cause the issue described.