Subnet mask is used to determine how long the network ID length is and how many bits is allocated to the network ID and host ID and tells the router which part of the address network ID and host ID.ĬIDR stands for (Classes Inter-Domain Routing) is used to represent an IP address range and the network mask for example “/n” where the x’s represent the IP address of the CIDR and “n” being the network prefix. Subnet gives the ability to have the network ID of any length of our choosing. This enables network administrators to better utilize the available address and helps have more realistic host limits that is not restrained to A, B and C class limits.Ĭan be created using any of the IP classes A, B and C but these can have limitation due to the fixed network ID length such as 8, 16 and 24. These reserved addresses cannot be used for the hosts on each subnet the rest of the addresses in the subnet can be used. In each subnet two addresses are reserved for the network address which ends in 0 and the broadcast address which ends in 1. Their IP addresses range from 192 to 233 and their default subnet mask is 255.255. In addition, Class C IP addresses are normally assigned to a very small-sized network. Subnet masks are 32 bits in length the network bits are in all “1” s and the host bits are in “0” s. Consequently, the default subnet mask for Class B is 255.255. Subnetting is great to split up the network into more manageable sections or different departments. Subnet mask is used to determine how many bits will be used to represent the network address.
#Subnet mask table for class b how to
You should at least know how to calculate subnets in decimal and be fast at it.
Theres not enough time during the exam to solve all of these questions by calculating in binary. Internet Protocol (IP) has two parts a network address and a host address. During the Cisco CCNA / CCNP Routing & Switching exam (s) you get plenty of subnetting related questions. Subnetting is when the network is broken into different block sections using logical addresses to segregate each block.
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