CompTIA Server+ (SK0-005) — Question 4

A server technician is configuring the IP address on a newly installed server. The documented configuration specifies using an IP address of 10.20.10.15 and a default gateway of 10.20.10.254. Which of the following subnet masks would be appropriate for this setup?

Answer options

• A. 255.255.255.0
• B. 255.255.255.128
• C. 255.255.255.240
• D. 255.255.255.254

Correct answer: A

Explanation

The correct subnet mask is 255.255.255.0, which allows for 256 IP addresses in the subnet, accommodating the server and its gateway. The other options either provide insufficient addresses for a typical subnet (like 255.255.255.240) or are not suitable for the given network configuration (like 255.255.255.128 or 255.255.255.254).