Question 1

What is CIDR notation?

Accepted Answer

CIDR (Classless Inter-Domain Routing) notation like /24 indicates how many bits are used for the network portion of the address. A /24 means 24 bits for the network and 8 bits for hosts, giving 254 usable addresses.

Question 2

What is a subnet mask?

Accepted Answer

A subnet mask separates the network and host portions of an IP address. For example, 255.255.255.0 (/24) means the first three octets identify the network and the last octet identifies individual hosts.

Question 3

How many hosts can a subnet have?

Accepted Answer

The number of usable hosts is 2^(32-CIDR) - 2. The minus 2 accounts for the network address and broadcast address. A /24 has 254 usable hosts, /16 has 65,534, and /8 has 16,777,214.

Property	Value
IP Address	192.168.1.0/24
Subnet Mask	255.255.255.0
Wildcard Mask	0.0.0.255
Network Address	192.168.1.0
Broadcast Address	192.168.1.255
First Usable Host	192.168.1.1
Last Usable Host	192.168.1.254
Total Addresses	256
Usable Hosts	254
IP Class	C

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