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…

The correct answer is A. 255.255.255.0. For the IP 10.20.10.15 and gateway 10.20.10.254 to communicate directly, both addresses must reside in the same subnet. With 255.255.255.0 (/24), the network is 10.20.10.0 with a range of .1–.254, placing both the host (.15) and gateway (.254) in the same network…

Server administration

Question

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?

Options

A255.255.255.0
B255.255.255.128
C255.255.255.240
D255.255.255.254

How the community answered

(26 responses)

A
85% (22)
B
4% (1)
C
8% (2)
D
4% (1)

Explanation

For the IP 10.20.10.15 and gateway 10.20.10.254 to communicate directly, both addresses must reside in the same subnet. With 255.255.255.0 (/24), the network is 10.20.10.0 with a range of .1–.254, placing both the host (.15) and gateway (.254) in the same network. 255.255.255.128 (/25) splits into two subnets (.0–.127 and .128–.255), placing .15 and .254 in different subnets. 255.255.255.240 (/28) and 255.255.255.254 (/31) are even smaller and cannot include both addresses in the same subnet.

Topics

#IP Addressing#Subnetting#Network Configuration#Default Gateway

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