Definition - What does Subnet Mask mean?
A subnet mask is a 32-bit number used to differentiate the network component of an IP address by dividing the IP address into a network address and host address.
The default subnet mask:
This is usually done for the following purposes:
a. Reducing network traffic by decreasing the number of broadcasts
b. Exceeding the limitations in a local area network
c. Enabling people to connect to the network remotely without opening the entire network
Advantages of using Subneting:-
a. Easier network management and trouble shooting
b. Routing table’s size is reduced which means faster network transfers
c. Solves network congestion problems:- Since the complete network is divided into smaller networks
d. Network addresses can be decentralized e.g. the administrator of the network can monitor the subnet.
The default subnet mask:
- Class A: 255.0.0.0
- Class B: 255.255.0.0
- Class C: 255.255.255.0
What is Subneting? Explain the default subnet mask is as follows:he advantages of using Subneting.
Subneting is a process of breaking the network into smaller units. These units care called as subnets.By using subnetting, one single Class IP address can be used to have smaller sub-networks which provides better network management capabilities.This is usually done for the following purposes:
a. Reducing network traffic by decreasing the number of broadcasts
b. Exceeding the limitations in a local area network
c. Enabling people to connect to the network remotely without opening the entire network
Advantages of using Subneting:-
a. Easier network management and trouble shooting
b. Routing table’s size is reduced which means faster network transfers
c. Solves network congestion problems:- Since the complete network is divided into smaller networks
d. Network addresses can be decentralized e.g. the administrator of the network can monitor the subnet.
Class A Subnets
In Class A, only the first octet is used as Network identifier and rest of three octets are used to be assigned to Hosts (i.e. 16777214 Hosts per Network).
The Subnet mask is changed accordingly to reflect subnetting. Given below is a list of all possible combination of Class A subnets:
In case of subnetting too, the very first and last IP address of every subnet is used for Subnet Number and Subnet Broadcast IP address respectively. Because these two IP addresses cannot be assigned to hosts, sub-netting cannot be implemented by using more than 30 bits as Network Bits, which provides less than two hosts per subnet.
Class B Subnets
By default, using Classful Networking, 14 bits are used as Network bits providing (214) 16384 Networks and (216-2) 65534 Hosts. Class B IP Addresses can be subnetted the same way as Class A addresses. Below is given all possible combination of Class B subnetting:
Class C Subnets
Class C IP addresses are normally assigned to a very small size network because it can only have 254 hosts in a network. Given below is a list of all possible combination of subnetted Class B IP address:
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