SK0-004 · Question #700
A technician is trying to configure a NIC on a server. Which of the following is an invalid method to express subnetting?
The correct answer is B. 192.168.0.1. Subnetting must be expressed as a subnet mask or CIDR prefix length, not as a plain IP address.
Question
A technician is trying to configure a NIC on a server. Which of the following is an invalid method to express subnetting?
Options
- A/24
- B192.168.0.1
- C255.254.0.1
- D255.255.255.0
How the community answered
(42 responses)- A2% (1)
- B88% (37)
- C7% (3)
- D2% (1)
Why each option
Subnetting must be expressed as a subnet mask or CIDR prefix length, not as a plain IP address.
/24 is valid CIDR prefix notation representing 255.255.255.0.
192.168.0.1 is a host IP address, not a valid representation of a subnet mask. Valid subnet expressions are either CIDR prefix notation such as /24, or dotted-decimal subnet masks such as 255.255.255.0, which use a contiguous block of 1-bits followed by 0-bits. An arbitrary IP address has no mathematical meaning in the context of subnetting.
255.254.0.1 is expressed in dotted-decimal subnet mask format and is a valid, if non-standard, way to attempt to represent a mask, making it a valid method of expression even if rarely used.
255.255.255.0 is a standard and valid dotted-decimal subnet mask representation.
Concept tested: Valid subnet mask notation formats
Source: https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/tcpip-addressing-and-subnetting
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