CompTIA Network+ (N10-009) — Question 186

An ISP provided a company with an IP range of 98.174.235.142/28. A network technician configured a router with a subnet mask of 255.255.255.224 and default gateway of 98.174.235.129. After the configuration was set up. the company is unable to connect to the ISP. Which of the following would resolve this issue?

Answer options

• A. Change the subnet mask to .240.
• B. Change the Ethernet cable from the external interface to the modem.
• C. Change the CIDR to /29.
• D. Change the static IP to 98.174.235.128/28.

Correct answer: A

Explanation

The correct answer is A because changing the subnet mask to .240 aligns the subnetting with the provided IP range of /28, allowing proper communication with the ISP. The other options do not address the subnet mask misconfiguration, and simply changing the Ethernet cable, CIDR, or static IP does not solve the underlying issue of incorrect subnetting.