In CIDR notation, what does a /24 subnet mask represent?

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Question: In CIDR notation, what does a /24 subnet mask represent?

Options:

Correct Answer: 255.255.255.0

Solution:

A /24 subnet mask corresponds to 255.255.255.0, allowing for 256 IP addresses in the subnet.

In CIDR notation, what does a /24 subnet mask represent?

In CIDR notation, what does a /24 subnet mask represent?

Step 1: Understand what CIDR notation is. CIDR stands for Classless Inter-Domain Routing, and it is a way to represent IP addresses and their associated network masks.
Step 2: Recognize that the '/24' in CIDR notation indicates the number of bits used for the network part of the address.
Step 3: Realize that a /24 subnet mask means that the first 24 bits of the IP address are used for the network, and the remaining bits are used for host addresses.
Step 4: Convert the /24 notation to a traditional subnet mask. A /24 subnet mask is equivalent to 255.255.255.0.
Step 5: Calculate the number of available IP addresses in a /24 subnet. With 8 bits left for hosts (32 total bits - 24 bits for the network), you can have 2^8 = 256 addresses.
Step 6: Note that out of these 256 addresses, 1 is reserved for the network address and 1 for the broadcast address, leaving 254 usable IP addresses for devices.

CIDR Notation – CIDR (Classless Inter-Domain Routing) notation is a method for allocating IP addresses and IP routing that uses a suffix to indicate the number of bits in the subnet mask.
Subnet Mask – A subnet mask is a 32-bit number that divides an IP address into network and host portions, determining how many addresses can be used within a subnet.
IP Address Calculation – Understanding how to calculate the number of usable IP addresses based on the subnet mask.