NetMask

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You can find the netmask for a network interface in Linux by using the ifconfig or ip command. 

 

Using ifconfig: 

 

ifconfig <interface-name> 

 

 

Replace <interface-name> with the name of the interface that you want to find the netmask for. The netmask is usually listed next to the "netmask" keyword in the output. 




Netmask is 255.255.255.0 

 

What is a Netmask 

 

In computer networking, a netmask (short for "network mask") is a 32-bit number that is used to divide an IP address into subnets and determine the network and host portions of the address. 

The netmask is a binary pattern of 1s and 0s that is applied to the IP address, and it identifies which bits in the IP address correspond to the network portion and which bits correspond to the host portion. The network portion of the IP address is used to identify the network to which the device belongs, and the host portion is used to identify the specific device within the network. 

For example, if an IP address is 192.168.1.100 and the netmask is 255.255.255.0, then the first three octets (192.168.1) identify the network and the last octet (100) identifies the host within the network. The netmask specifies that the first three octets of the IP address are part of the network portion (indicated by the 1 bits in the netmask) and the last octet is part of the host portion (indicated by the 0 bits in the netmask). 

Netmasks are important in networking because they enable devices to communicate with other devices on the same network and route traffic to devices on other networks.

 

 

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