100-140 Question 203
Single answerYou are troubleshooting a connectivity issue between two devices on a company network. Device A has the IP address 192.168.1.25 with a subnet mask of 255.255.255.0, and Device B has the IP address 192.168.2.10 with the same subnet mask. Based on the IP address ranges and subnet mask, what is the most likely cause of the issue?
- A
Both devices are in the same subnet, so the issue is unrelated to IP addressing.
- B
Device B's IP address is a public IP and cannot communicate with Device A's private IP.
- C
The subnet mask does not allow these two IP addresses to be in the same subnet.
- D
Device A's IP address is reserved for public use and cannot communicate with Device B.
Show answer and explanation
Correct answer: C
Explanation
The subnet mask 255.255.255.0 divides the network into distinct subnets where the first three octets determine the network portion. Device A is on the 192.168.1.x subnet, while Device B is on the 192.168.2.x subnet. These subnets are different, and the devices cannot communicate directly without proper routing or configuration.
- A. Incorrect.
Incorrect. The two devices are not in the same subnet based on the subnet mask and their IP addresses.
- B. Incorrect.
Incorrect. Both IP addresses, 192.168.1.25 and 192.168.2.10, are private and not public.
- C. Correct.
Correct. The subnet mask of 255.255.255.0 creates a range of IP addresses that separates 192.168.1.x and 192.168.2.x into different subnets, preventing communication without routing.
- D. Incorrect.
Incorrect. The IP address 192.168.1.25 is a private IP address, not a reserved public IP.